freecalypso-tools: doc/TIFFS-Overview annotate

annotate doc/TIFFS-Overview @ 928:65953c172f24

rvinterf/lowlevel: new hex dump format

author	Mychaela Falconia <falcon@freecalypso.org>
date	Tue, 23 May 2023 05:23:19 +0000
parents	0306449ba467
children

rev	line source
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	1 [Historical note: this document was originally written in 2014 when the vision
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	2 of FreeCalypso was very different from what it is today. Since then we have
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	3 transitioned from making aftermarket hacks on pre-existing Calypso phones and
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	4 modems to producing and supporting our own FreeCalypso hardware products, and
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	5 our firmware work has changed from a nebulous dream to stable production code.
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	6 The ways in which we approach various technical aspects have changed
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	7 accordingly, but much of our documentation has been slow to catch up. The
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	8 documentation is now being updated, but there may still be some passages where
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	9 the old world view shines through.]
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	10
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	11 All TI GSM firmwares known to this author (Mother Mychaela of FreeCalypso)
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	12 implement some kind of flash file system, or FFS. Several different FFS code
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	13 implementations, and correspondingly several different on-flash data formats,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	14 have been used throughout the history of TI's involvement in the wireless
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	15 terminal business. The FFS incarnation of primary interest to the FreeCalypso
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	16 project is the one invented by Mads Meisner-Jensen at TI in the early 2000s
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	17 (at least according to the comments in the sources available to us), and it is
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	18 relevant to us in the following ways:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	19
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	20 * When targeting the GSM modem in Openmoko's GTA01/02 smartphones, we need to
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	21 work with the original FFS from the factory (call it MokoFFS), the same FFS
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	22 as used by the mokoN firmwares: this FFS contains the IMEI and the RF
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	23 calibration values from the factory, which we most certainly don't want to go
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	24 without.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	25
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	26 * The Leonardo firmware semi-src which we are using as the reference for
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	27 building our own full source, multi-target GSM fw contains a turnkey-working
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	28 implementation of this very FFS, using the on-flash format in question and
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	29 providing run-time APIs expected by the rest of the GSM fw suite. Following
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	30 the principle of ``if it ain't broke, don't fix it'', we use this FFS not
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	31 only on the gtamodem target, but also on other targets, including those where
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	32 we are starting from a blank state and thus have the freedom to use whatever
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	33 FFS we like.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	34
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	35 * The original proprietary fw on the Pirelli DP-L10 phone also happens to use
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	36 an FFS in the same format, although Pirelli's FFS does not contain the IMEI
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	37 or any of the RF calibration values. This Pirelli phone was originally a
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	38 target of high interest for FreeCalypso, as we had high hopes of turning it
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	39 into a libre phone by way of our aftermarket firmware - but this plan has
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	40 since been abandoned when it became clear that Pirelli's hw is unsuitable for
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	41 aftermarket fw development because of the multitude of extra peripheral chips
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	42 for non-GSM functions which get in the way. In the earlier years of
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	43 FreeCalypso a lot of effort had been invested into studying all aspects of
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	44 the Pirelli DP-L10 phone and its original firmware, including the FFS.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	45
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	46 Naming
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	47 ======
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	48
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	49 I have previously referred to the FFS format in question as Mokopir-FFS or
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	50 MPFFS, from "Moko" and "Pirelli". I was originally hesitant to call it TIFFS,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	51 as lacking the source code, I had no way of knowing whether the FFS format and
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	52 implementation were of TI's own invention, or something that TI licensed as a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	53 black box from one of their many proprietary software partners. (I was unable
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	54 to identify it as any well-known, industry-standard FFS format, but absence of
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	55 evidence is not evidence of absence.) But now that we have TI's original source
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	56 code which implements this FFS (first the MV100-0.1.rar source, then the full
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	57 Leonardo one), complete with comments and a HISTORY file, we know that our FFS
734 23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	58 was invented and implemented by someone named Mads Meisner-Jensen at TI-DK,
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	59 apparently their flash chip expert who also wrote FLUID.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	60
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	61 I am now making a naming transition from MPFFS to TIFFS: there is really no
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	62 link between this FFS format and the Openmoko+Pirelli duo, other than the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	63 happenstance of me having first encountered this FFS on these two GSM device
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	64 brands, and the name TIFFS is more neutrally-descriptive.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	65
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	66 What it is
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	67 ==========
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	68
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	69 In a rare departure from TI's norm (most of TI's GSM firmware and associated
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	70 development tools suffer from heavy Windows poisoning), what I call TIFFS is
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	71 very Unixy. It is a file system with a hierarchical directory tree structure
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	72 and with Unixy forward-slash-separated, case-sensitive pathnames; the semantics
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	73 of "what is a file" and "what is a directory" are exactly the same as in UNIX;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	74 and TIFFS even supports symlinks, although that support is a little under-
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	75 developed, and apparently no FFS symlinks were ever used in any production GSM
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	76 device. Thus the FFS implemented in TI-based GSM devices (modems and
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	77 "dumbphone" handsets) is really no different from, for example, JFFS2 in
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	78 embedded Linux systems.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	79
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	80 (The only traditional UNIX file system features which are missing in TIFFS are
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	81 the creation/modification/access timestamps and the ownership/permission
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	82 fields.)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	83
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	84 The FFS in a GSM device typically stores two kinds of content:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	85
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	86 * Factory data: IMEI, RF calibration values, device make/model/revision
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	87 ID strings etc. These files are expected to be programmed on the factory
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	88 production line and not changed afterward.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	89
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	90 * Dynamic data written into the FFS in normal device operation: when you use a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	91 "dumbphone" running TI-based firmware, every time you store something "on the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	92 phone" or in "non-volatile memory", that item is actually stored in the FFS.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	93 (Where else, if you think of it?) That includes contacts and received SMS
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	94 stored "on the phone" instead of the SIM, any selections you make in the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	95 settings/preferences menus which persist across reboots (power cycles), call
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	96 history etc.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	97
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	98 It needs to be noted that the "dynamic data" aspect of FFS usage applies not
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	99 only to complete phones, but also to modems like the one used in the GTA01/02.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	100 One would naively think that non-volatile storage of data in flash outside of
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	101 factory programming would be needed only in a device with its own UI, and that
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	102 a modem subservient to external AT commands would be completely stateless
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	103 across reboot/power cycles; but that is not the case in actuality. TI-baseed
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	104 GSM firmwares, including Openmoko's mokoN and our own FreeCalypso, are designed
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	105 to always "mount" their FFS with read/write access; TI's FFS implementation in
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	106 the firmware has no concept of a "read-only mount".
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	107
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	108 I am still investigating just what kinds of data are routinely written into the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	109 non-volatile FFS by the firmware in normal operation on devices like the GTA0x
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	110 modem, but there most definitely are some.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	111
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	112 There is no hard separation between "static" and "dynamic" data in the file
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	113 system structure; TIFFS is thus akin to an embedded Linux system with just a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	114 single root file system containing both "static" files like userland binaries
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	115 and "dynamic" ones like configuration files under /etc which the user is
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	116 expected to edit with vi after logging into the box, or log and similar files
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	117 created by the system itself under /var, for example.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	118
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	119 Where it lives
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	120 ==============
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	121
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	122 The type of flash memory used in Calypso GSM modems and "dumbphones" is called
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	123 NOR flash. This NOR flash memory is physically divided (by the design of the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	124 flash chip itself) into units called "sectors" or more descriptively, erase
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	125 blocks. The typical NOR flash sector size (in Calypso GSM devices) ranges from
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	126 64 KiB in the GTA02 modem's NOR flash (4 MiB total) to 256 KiB in the
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	127 S71PL129NC0 flash+RAM chip used in the Pirelli DP-L10 and in our own FreeCalypso
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	128 hardware designs (16 MiB of flash total). The key physical property is that
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	129 any bit may be changed from a '1' to a '0' at any time, in any combination, but
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	130 resetting of '0' bits back to ones can be done only on the granularity of these
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	131 largish sectors, in an operation called "sector erase".
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	132
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	133 The location of TIFFS within the flash memory of a given GSM device is defined
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	134 by the firmware design of that device, but is always some integral number of
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	135 contiguous flash sectors. Some examples:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	136
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	137 * On the GTA01/02 GSM modem, FFS occupies 7 sectors of 64 KiB each, starting at
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	138 flash offset 0x380000.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	139
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	140 * On the Pirelli DP-L10, the FFS used by the original proprietary fw occupies
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	141 18 sectors of 256 KiB each (for 4.5 MiB in total), starting at the beginning
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	142 of the 2nd flash chip select (0x02000000 in the ARM7 address space).
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	143
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	144 * On Motorola/Compal C139/140 phones, the FFS used by the original proprietary
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	145 fw occupies 5 sectors of 64 KiB each (320 KiB in total), starting at 0x370000.
482 3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	146 C11x/12x use smaller FFS configurations, whereas C155/156 use a different FFS
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	147 implementation with a completely different on-flash format - see the new
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	148 Compal-FFS article for more details.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	149
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	150 * On our own FreeCalypso hardware family we have put our FFS in the first 8
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	151 sectors (of 256 KiB each) in the 2nd flash chip select bank, which appears at
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	152 0x01800000 in the ARM7 address space instead of Pirelli's 0x02000000 because
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	153 we have wired the 2nd flash chip select to nCS2 on the Calypso instead of
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	154 Pirelli's nCS3.
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	155
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	156 * The smallest real FFS configuration called for by the table in dev.c in TI's
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	157 original Leonardo fw source is 3 sectors of 64 KiB each; the same table also
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	158 sports a 4 KiB x 4 configuration for RAM-based testing (emulation of FFS in
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	159 RAM without real flash).
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	160
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	161 * The largest FFS configuration that has been envisioned by the original
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	162 designers seems to be somewhere around 128 sectors.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	163
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	164 Each flash sector used for TIFFS begins with this 6-byte signature:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	165
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	166 46 66 73 23 10 02
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	167
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	168 The first 4 bytes are 'Ffs#' in ASCII, and the following two bytes are the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	169 format version number of 0x0210 in little-endian byte order. The following two
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	170 bytes give a count of how many times that sector has been erased and rewritten
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	171 (FF FF in "fresh" or "virgin" FFS images), and the following byte indicates
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	172 that block's role and status in the FFS life cycle.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	173
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	174 How it works
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	175 ============
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	176
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	177 Just like JFFS2 and other high-quality flash file systems, TIFFS is designed to
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	178 recover gracefully from any possible power failure or crash: one can yank the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	179 battery from the GSM device (or induce a firmware crash) at the most mis-
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	180 opportune moment in the middle of an FFS write operation, and the FFS is
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	181 expected to recover on the next boot cycle. I won't be able to document here
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	182 all gory details of exactly how this goal is achieved, partly because I haven't
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	183 studied the code to the requisite level of depth myself yet, but all of the
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	184 responsible code lives under src/cs/drivers/drv_app/ffs in our fc-magnetite and
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	185 fc-selenite source trees; feel free to study it.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	186
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	187 In its "normal" or "clean" state (i.e., when not in the middle of a write
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	188 operation or recovery from an ungracefully interrupted one), a TIFFS instance
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	189 consists of the following 3 types of blocks:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	190
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	191 * One block containing inode records, indicated by AB in its type/flags/status
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	192 byte in the block header;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	193 * N-2 blocks (where N is the total number of flash sectors allocated for the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	194 FFS) containing (or waiting to be filled with) data chunks - indicated by BD
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	195 in the type/flags/status byte;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	196 * One "free" block, indicated by BF - destined to become a new AB or a new BD
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	197 at some point.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	198
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	199 Each object written into the FFS (file, directory or symlink) consists of a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	200 16-byte inode record written into the AB block and a data chunk written into
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	201 one of the BD blocks. The data chunk includes the name of the object, hence
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	202 one is required even for directories. Data chunks are contiguous, uncompressed,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	203 and subject to an upper size limit of 2048 or 8192 bytes, depending on the FFS
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	204 configuration. Files larger than this limit are stored in a "segmented" form,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	205 giving rise to a 4th inode or object type (after file, directory and symlink):
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	206 segment. Each segment of a segmented file consists of not only a data chunk,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	207 but also an inode record for the segment, which gives the location of the data
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	208 chunk and ties the segment object into the overall FFS structure, making it
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	209 accessible.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	210
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	211 Because aside from complete sector erasure, flash memory bits can only
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	212 transition from '1' to '0' but not the other way around, overwriting an existing
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	213 file with some new content (an operation which any reasonable file system must
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	214 implement in some way) cannot be done in place. Instead like most flash file
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	215 systems, TIFFS implements this common operation by writing the new version of
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	216 the file to a new location (previously blank flash) and then invalidating the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	217 old version - and doing all that while keeping in mind the possibility of an
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	218 ungraceful crash or powerdown at any moment, and the requirement of recovering
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	219 gracefully from any such event.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	220
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	221 Of course as an FFS receives more write activity, even if one keeps overwriting
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	222 some existing files with new content of the same size, without adding to the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	223 visible total content size (think du(1) command), eventually all remaining blank
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	224 flash space will fill up. At that point (or at some earlier point, depending
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	225 on the FFS design and/or configuration) the FFS has to invoke a compaction or
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	226 reclamation or garbage collection procedure: any "mixed" blocks containing both
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	227 valid and stale data are transitioned into a "stale-only" state by having the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	228 active data moved to a new block, and then the "all stale" blocks are subjected
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	229 to sector erasure, becoming new blank sectors. The logic responsible for these
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	230 operations once again needs to be resilient to the possibility of a crash or
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	231 powerdown occurring at the most mis-opportune moment, and it also needs to
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	232 implement flash wear leveling: there is a physical limit to how many times a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	233 given flash sector can be erased and rewritten before it goes bad.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	234
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	235 All of the above are common and well-known principles, successfully implemented
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	236 in well-known flash file systems such as JFFS2 in Linux. TIFFS is absolutely
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	237 no different in this regard; for the implementation details, read the source
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	238 code.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	239
920 0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	240 TIFFS filename and pathname limits
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	241 ==================================
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	242
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	243 Classic TIFFS, as in the canonical firmware source from TI, imposes the
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	244 following limits on the content written into FFS:
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	245
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	246 * Each elementary filename or pathname component (the name of each individual
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	247 file or subdirectory within its parent directory) is limited to 20 characters;
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	248
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	249 * The set of allowed characters in these elementary filenames is limited to
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	250 [A-Za-z0-9_.,+%$#-];
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	251
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	252 * The maximum pathname depth is limited to 6.
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	253
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	254 As an illustration of the pathname depth limit, the deepest allowed path to a
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	255 non-directory file is /d1/d2/d3/d4/d5/file. It is also possible to have a
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	256 directory nesting of /d1/d2/d3/d4/d5/d6, but in this case the deepest directory
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	257 can only be empty.
0306449ba467 doc/TIFFS-Overview: document classic filename and pathname limits Mychaela Falconia <falcon@freecalypso.org> parents: 734 diff changeset	258
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	259 How this FFS comes into being
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	260 =============================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	261
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	262 (This section is only relevant to you if you plan on physically producing your
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	263 own GSM phones or modems on your own factory production line, like we currently
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	264 do at our family company, or if you simply enjoy knowing how it is done.)
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	265
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	266 To my knowledge, TI never used or produced a tool akin to mkfs.jffs2 in the
734 23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	267 embedded Linux world, or akin to our recently developed tiffs-mkfs, which would
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	268 produce a TIFFS image complete with some initial directory and file content
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	269 "in vitro". Instead it appears that the FFS instances found in shipped products
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	270 such as Openmoko phones have been created "in vivo" by TI's firmware running on
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	271 the device itself during the "production test" phase.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	272
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	273 We never got a copy of the original factory production line software that was
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	274 used by Openmoko, but we have successfully replicated the process using our own
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	275 Unix/Linux-based FreeCalypso host tools, the very same tools that are contained
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	276 in the present source package you are looking at. The process goes like this:
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	277
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	278 * When the printed circuit board is physically populated with components such
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	279 as the Calypso chip and the flash chip, the latter can be blank - if the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	280 board design has the nIBOOT pin pulled low, enabling the Calypso boot ROM
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	281 (Openmoko and Pirelli both good on this one, but shame on Compal!), there is
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	282 no need to preprogram the flash chip with anything prior to populating it on
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	283 the board, and the device remains fully unbrickable at all times afterward.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	284
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	285 * When the assembled board is powered up for the first time, with completely
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	286 blank flash, the Calypso boot ROM will sit there and patiently wait for a
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	287 code download on either of its two UARTs.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	288
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	289 * Using TI's FLUID (Flash Loader Utility Independent of Device) or FreeCalypso's
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	290 fc-loadtool free replacement, the factory production station loads the main
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	291 firmware image into the flash. Note, it is just the firmware image at this
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	292 step, and the FFS sectors remain blank.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	293
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	294 * The board is commanded to reboot (or power-cycled), and the firmware image
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	295 boots for the first time.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	296
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	297 * TI's FFS implementation code in their standard firmware reacts to all blank
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	298 flash in the FFS sectors as follows: it performs what they call the preformat
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	299 operation, writing the TIFFS signature and a BF state byte into every FFS
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	300 sector, but the main "format" operation, which sets up the AB/BD block roles,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	301 creates the root inode and makes the FFS ready to accept the creation of its
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	302 first directories and files, is not done automatically.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	303
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	304 In order to perform the FFS format operation and then fill the new FFS with
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	305 whatever directories and files are deemed needed to be present in "fresh"
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	306 shipping products, the factory production station connects to the just-booted
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	307 firmware running on the target via the RVT/ETM protocol (see the RVTMUX
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	308 write-up), and sends "test mode" commands to this running firmware. These
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	309 "FFS test mode" (or TMFFS) commands include the format operation, an mkdir
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	310 operation to create directories, and a "file write" operation akin to doing
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	311 'cat > /dir/whatever/file', creating files in FFS and storing any desired data
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	312 in them.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	313
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	314 The IMEI is assigned and written into FFS in this process, but it is not the
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	315 only data item that will be unique for each individual device made. Much more
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	316 important are the RF calibration values; the factory calibration procedure does
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	317 the following for each individual unit:
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	318
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	319 * Measures the frequency offset produced by the VCXO as a function of the AFC
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	320 DAC control value and constructs the afcparams table based on these
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	321 measurements;
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	322
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	323 * Characterizes the dBm output of the Tx chain as a function of the APC DAC
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	324 control value and comes up with a set of these DAC values which produce Tx
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	325 power levels prescribed by the GSM 05.05 spec;
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	326
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	327 * Determines the correction values which need to be applied in order to set the
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	328 correct Rx path gains and to determine the true Rx signal level from the dBfs
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	329 power measurements made in the DSP from Rx I&Q samples.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	330
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	331 These calibration procedures are performed by connecting a suitable RF test
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	332 instrument (R&S CMU200 is the industry gold standard) to the GSM device's
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	333 antenna connector or RF test port and running special calibration programs
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	334 which talk both to the CMU200 or other test instrument and to the L1TM (Layer 1
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	335 test modes) component in the DUT (device under test). In FreeCalypso hardware
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	336 manufacturing we use a CMU200 instrument which is itself maintained in good
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	337 calibration standing, and for the calibration software we use our own
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	338 fc-rfcal-tools which talk to the DUT via rvinterf.
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	339
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	340 All of the resulting calibration values are stored in a bunch of files under the
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	341 /gsm/rf subtree, and these files are "owned" by the L1 code. The latter has
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	342 RAM data structures which correspond to these files; upon normal boot the
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	343 initialization code looks in FFS, and if it finds any of the RF calibration
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	344 files, it reads each present file into the corresponding RAM data structure,
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	345 overwriting the compiled-in defaults. With TI's standard production calibration
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	346 procedure which we have replicated in our FreeCalypso hw manufacturing setup,
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	347 these RF calibration files in FFS come into being as follows:
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	348
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	349 * The Test Mode support code in L1 (i.e., part of the main GSM fw) performs the
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	350 measurements and stores results in its RAM data structures as commanded by
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	351 the production test station through the Test Mode interface;
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	352
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	353 * Certain special test mode commands encoded via the MISC_ENABLE opcode direct
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	354 the above L1TM code to write its RAM data structures into FFS.
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	355
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	356 See the RF_tables article for more information.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	357
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	358 Compal and Pirelli differences
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	359 ==============================
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	360
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	361 The above description refers to TI's vanilla reference version, and it seems
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	362 like Openmoko (FIC) was the only phone/modem manufacturer (prior to us!) who
482 3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	363 followed it without major deviations. In contrast, both Compal (Motorola C1xx
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	364 and Sony Ericsson J100) and Foxconn (Pirelli DP-L10) moved their vital per-unit
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	365 factory data (IMEI and RF calibration) out of the FFS into their own ad hoc
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	366 flash data structures (which are very difficult to reverse-engineer and make
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	367 use of, unfortunately), leaving their FFS only for less critical data.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	368
482 3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	369 In Compal's case (all C1xx models and SE J100) the FFS stores only users'
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	370 personal information and nothing more. One can turn the phone off, use
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	371 fc-loadtool to erase the FFS sectors, and boot the regular fw back up; the fw
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	372 will automatically do a new FFS format (it even displays a message on the LCD
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	373 as it does so) and carry on happily as a "fresh" or "blank", perfectly
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	374 functional and usable phone. Please see the new Compal-FFS article for further
3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	375 details.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	376
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	377 In Pirelli's case, booting their official fw with blank FFS sectors will also
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	378 result in the FFS being automatically formatted, but their fw expects some
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	379 static "asset" files to be present in this FFS: UI graphics and language
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	380 strings, ringtones, firmware images for the WiFi and VoIP processors and some
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	381 static configuration files, about 3 MiB in total. Thus although the firmware
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	382 will auto-format the blank FFS sectors, it won't function normally with all of
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	383 these "asset" files missing. Foxconn's original factory production line station
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	384 must have uploaded these files to each phone via the TMFFS2 protocol, and our
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	385 FreeCalypso suite now features a tool that can replicate this feat: fc-fsio.
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	386
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	387 Aftermarket FFS for FreeCalypso on Compal & Pirelli targets
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	388 ===========================================================
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	389
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	390 When we run our own FreeCalypso fw on "alien" (not native to us) Mot C1xx and
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	391 Pirelli DP-L10 hardware, we don't use the FFS from their respectively original
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	392 firmwares: those original FFS instances don't contain any bits of interest to
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	393 us, trying to make our fw use the same FFS as Mot/Compal's or Pirelli's original
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	394 fw would be more trouble than benefit, and on one of the target devices in this
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	395 family (Mot C155/156) the original FFS is in some different format. Instead we
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	396 create our own aftermarket FFS for our FreeCalypso fw on these alien hw targets,
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	397 using a different flash location from the original so that the original fw's FFS
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	398 cannot be mistaken for our own.
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	399
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	400 On the Pirelli DP-L10 we put our aftermarket FFS in an area of the flash which
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	401 the official fw family uses as a staging area for over-the-air firmware updates,
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	402 thus as long as you are not doing official fw updates over WLAN (i.e., if you
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	403 only run one fixed official fw version or flash different official fw versions
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	404 with fc-loadtool without going through "fw update" protocols), our aftermarket
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	405 FFS used by our run-from-RAM FreeCalypso firmwares should remain undisturbed
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	406 while the phone is in the official fw mode.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	407
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	408 The situation is different on Mot C1xx phones. The lower-end C1xx models
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	409 including the C139 (our primary hw target in this family) have too little RAM
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	410 to run our FreeCalypso fw entirely out of RAM without flashing; the C155/156
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	411 subfamily does have enough RAM to allow a complete FC GSM fw image to be loaded
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	412 and run via fc-xram under some conditions (we previously supported such usage
482 3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	413 in our now-retired Citrine fw and we also support it in the gcc-built config of
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	414 FC Selenite), but there is no place in the flash where we can put our
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	415 aftermarket FFS without overwriting some part of the original fw or its data -
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	416 thus our general procedure for running FreeCalypso on any C1xx model is to
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	417 convert the victim phone to FC on a long-term basis by flashing our modified
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	418 bootloader, flashing one of our fw builds and establishing a FreeCalypso
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	419 aftermarket FFS in a flash area designated by us.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	420
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	421 It was already mentioned earlier that the factory RF calibration values on these
482 3100f534340b doc updates for Compal FFS Mychaela Falconia <falcon@freecalypso.org> parents: 431 diff changeset	422 alien phones are stored in non-TIFFS flash data structures of Compal's or
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	423 Foxconn's invention, and our currently supported FreeCalypso firmwares
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	424 (Magnetite and Selenite) do not contain any code for reading these alien data
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	425 structures. (FC Citrine could read directly from Pirelli's factory data block,
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	426 but none of our fw offerings ever parsed Compal's weird flash records.) Instead
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	427 our current approach is to have an external tool extract the bits of interest
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	428 from the alien factory records, convert them to our TI-standard format if
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	429 necessary, and upload them into our FreeCalypso aftermarket FFS. The specifics
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	430 are as follows:
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	431
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	432 * The Pirelli DP-L10 is a breeze: simply run our special pirelli-magnetite-init
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	433 command in fc-fsio while connected to a Magnetite or Selenite fw instance
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	434 running with our aftermarket FFS, and the tool will copy both the IMEI and
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	435 the RF calibration records from Pirelli's factory data block into our
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	436 aftermarket FFS.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	437
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	438 * Mot C1xx phones present a lot more hassle: our current official procedure is
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	439 to make a dump of the flash prior to the xenotransplantation procedure (also
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	440 serves as a backup), extract the RF calibration values with our c1xx-calextr
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	441 tool, and then later in the procedure when you initialize your aftermarket FFS
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	442 with fc-fsio, upload these extracted and format-converted RF calibration files
734 23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	443 as one of the several steps involved. You will also need to enter your IMEI
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	444 manually: fc-loadtool flash compal-imei command can extract the factory IMEI
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	445 record from the flash chip's protection register and save it into a text file,
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	446 but you still need to feed it manually to the new firmware with fc-fsio
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	447 set-imeisv command.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	448
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	449 FreeCalypso host tools for TIFFS
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	450 ================================
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	451
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	452 Our FC host tools package supports TIFFS in two ways:
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	453
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	454 1) Our primary tool for working with GSM device file systems is fc-fsio. When
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	455 run against a compatible firmware version (primarily our own, but Pirelli's
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	456 proprietary fw is also compatible), fc-fsio allows various read and write
734 23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	457 operations to be performed on the target device FFS. fc-fsio can also be used
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	458 together with our fc-xram based FFS editing agent described below.
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	459
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	460 2) We have a TIFFS In Vitro Analyzer (IVA) tool for "in vitro" examination of
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	461 FFS images that have been read out of raw flash with fc-loadtool. See the
734 23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	462 TIFFS-IVA-usage article for more information. As a very recent addition, we
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	463 also have another "in vitro" tool (tiffs-mkfs) that goes the other way, creating
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	464 new complete TIFFS images from a tree of directories and files.
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	465
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	466 In addition to the above, back in the days of Openmoko (back when the Openmoko
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	467 community was still active and we considered ourselves a part of it) we had
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	468 produced a kit for editing the modem FFS on Openmoko GTA01/02 devices, giving
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	469 users an easy way to change their /pcm/IMEI file. Changing IMEIs for no good
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	470 reason is completely pointless and is actually detrimental rather than helpful
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	471 for privacy, but whoever came up with the edicts that "the IMEI MUST be
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	472 immutable" had obviously failed Human Psychology 101: declaring something to be
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	473 forbidden causes people to want it simply because it is forbidden and for no
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	474 other reason - hence the popular demand for IMEI changing tools.
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	475
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	476 Our Openmoko FFS editing kit from early 2014 consisted of a very early version
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	477 of what much later became the present FC host tools package (more specifically,
579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	478 it was before fc-fsio, and the set-imeisv command had been hacked into fc-tmsh
734 23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	479 instead) plus a pair of "in vivo" FFS editing agent target binaries that run on
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	480 the target by way of fc-xram. Our current FC host tools fully supplant the
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	481 ancient version in that 2014 kit, and our current replacement for the ancient
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	482 FFS editing agent is this new version:
431 579441d7dcd8 doc/TIFFS-Overview: long-overdue update for the current state of FC Mychaela Falconia <falcon@freecalypso.org> parents: 0 diff changeset	483
734 23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	484 https://www.freecalypso.org/hg/ffs-editor/
0 e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7 Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	485
734 23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	486 The new FFS editing agent linked above is run via fc-xram, while it is running
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	487 you communicate with it via rvinterf (launched directly from fc-xram as the 2nd
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	488 program), and you can run fc-fsio against it to perform whatever actual FFS
23f41a61ff7a doc/TIFFS-Overview: update for new developments Mychaela Falconia <falcon@freecalypso.org> parents: 482 diff changeset	489 manipulations are needed.

FreeCalypso > hg > freecalypso-tools

annotate doc/TIFFS-Overview @ 928:65953c172f24