FreeCalypso > hg > fc-am-toolkit

annotate doc/FC-aftermarket-intro @ 24:b71216a5f3c3

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
doc/C1xx-flashing: proofreading fixes
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 11 Jun 2023 19:11:47 +0000
parents 873d5f33e8f3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
22
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 Running FreeCalypso in aftermarket configurations - introduction
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 ================================================================
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 In the context of FreeCalypso family of projects, the term "aftermarket
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 configurations" means running FC firmware on alien hardware, primarily Motorola
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 C1xx and Pirelli DP-L10, as opposed to proper FreeCalypso development boards.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 Running our firmware on alien hw in aftermarket configs is NOT the primary
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 direction in FreeCalypso, has never been and never will be - however, such
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 aftermarket configs are supported to a limited extent, and have been so for a
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 long time. The reasons for our continued support of aftermarket configs are as
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 follows:
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 1] Even when you do have proper FreeCalypso hardware such as FCDEV3B, physical
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 portability is a concern. Development boards such as FCDEV3B and
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 Caramel/Luna are made to be used on a lab bench, complete with an ESD mat,
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 a multi-board arrangement with ribbon cables and a dedicated power supply.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 OTOH, a simple old phone of either Mot C1xx or Pirelli DP-L10 kind is an item
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 which you can easily take with you anywhere. Pirelli DP-L10 is ideal for
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 this purpose, thanks to its use of USB for both charging and host computer
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 connection, but even when you have to use Mot C1xx instead (because you don't
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 have a Pirelli phone, or because you need to do some work in the GSM850 band
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 that isn't supported on the Pirelli), it is still far more portable than a
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 "fully proper" development board setup.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 2] Those GSM enthusiasts and tinkerers who come from Osmocom background are
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 typically very familiar with Motorola C1xx phones, and typically already have
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 such hardware. Making it possible to run FreeCalypso firmware on that hw,
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 and making it as easy as possible, opens the door into our FreeCalypso
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 sorority for that target audience.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 However, it is important to point out that the combination of running
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 FreeCalypso fw on alien hw has significant limitations, compared to both
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 standard end user phones and traditional modem development boards, and these
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 limitations need to be covered from both directions.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 Lack of end user phone functionality
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 ====================================
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 In its current state as of this writing (mid-2023), our FreeCalypso firmware is
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 NOT capable of functioning as an end user phone! You *cannot* take a Motorola
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 or Pirelli phone, reflash it to FC and expect to continue using it as an end
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 user phone in that state - our firmware just isn't there. We do have a
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 minimally-passing functional configuration that runs as an untethered phone,
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 with a UI layer that draws on the LCD and accepts control via the keypad, but:
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 * The smallbw configuration of this handset UI (which is the only config we can
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 run on aftermarket phones) is badly bitrotten and functionally broken compared
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 to the bigcolor config - and the latter requires custom FreeCalypso hw that
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 currently exists only as a very messy multi-board arrangement for lab bench
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 use.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 * Even the better bigcolor config, exercised on our Luna development platform,
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 is still very unpolished, far from an end user product, and smallbw is even
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 worse.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 Of all aftermarket phone targets, the only hw model for which we have any
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 UI-enabled firmware build at all is C139: for that one model we have a
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 buildable, flashable and runable smallbw firmware configuration. (The physical
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 LCD on C139 is color, but because it is only 96x64 pixels, compared to 176x220
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 needed for bigcolor UI config, we run smallbw instead - a UI config derived by
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 slightly extending TI's C-Sample UI design, which was 84x48 pix B&W.)
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 Our prebuilt C1xx firmware packages include this smallbw firmware for C139, and
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 you can flash it into your phone using the present fc-am-toolkit. However, that
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 firmware should be treated as a preview of what may some day become possible,
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 NOT as a practically usable solution - you've been warned!
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 Aside from the just-described preview of maybe-some-day UI-enabled aftermarket
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 fw for C139, the much more actively supported FreeCalypso aftermarket firmware
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 configuration is voice pseudo-modem, or VPM for short. FreeCalypso VPM firmware
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 configs are available for all 4 aftermarket hw targets: all 3 subfamilies of
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72 Motorola C1xx, plus Pirelli DP-L10.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 When you run FC VPM firmware on a phone (on Mot C1xx it needs to be flashed, on
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75 Pirelli DP-L10 it runs in RAM without flashing), the phone's display stays dark
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76 and its buttons do nothing - there is no hw-model-specific LCD driver code
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77 included in the fw, hence we have no ability to display anything, and there is
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 no handset UI layer included in the functional config, hence even though we do
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
79 have a driver for the keypad, there is no action to be taken on button presses
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
80 other than to emit debug traces indicating such. Instead the phone turns into
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
81 a modem-like device that needs to be controlled via AT commands from the
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
82 connected host computer - hence the name VPM.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
83
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
84 VPM compared to proper TI/FreeCalypso modems
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
85 ============================================
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
86
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
87 On traditional modem development boards going back to near the beginning of TI's
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
88 GSM chipset program, and on Calypso-based finished modem products such as the
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 embedded GSM modem in Openmoko GTA01/02 smartphones, or Huawei GTM900 or iWOW
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
90 TR-800, there are two Calypso UARTs brought out, not just one. With traditional
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91 TI-family modem firmware, Calypso MODEM UART presents a classic ASCII AT command
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
92 interface, complete with CSD, GPRS and GSM 07.10 MUX, while the other Calypso
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
93 UART (called IrDA UART in hw terms, even when no actual IrDA is used) presents
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
94 TI's debug, development and factory production tools interface called RVTMUX.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
95
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
96 FreeCalypso VPM is different in that on all of our aftermarket Calypso hw
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
97 targets (Mot C1xx and Pirelli DP-L10), there is only one UART practically
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
98 accessible. In FreeCalypso we've adopted TI's RVTMUX interface, we make very
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
99 heavy use of it, so we are not giving it up. Instead our VPM firmware
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
100 sacrifices the traditional all-ASCII AT command channel. The AT command
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
101 interface to control the GSM MS is still there, but it is encapsulated inside
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
102 RVTMUX binary packets, and unless you are going to develop your own custom
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
103 software speaking this protocol, you need to use FreeCalypso tools rvinterf and
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
104 fc-shell to talk AT commands to FC VPM firmware.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
106 Two major areas of GSM MS functionality that are sacrificed in this arrangement
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
107 are CSD and GPRS. In our TI-inherited firmware architecture these two
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108 functional components are optional, i.e., they can be included or excluded in a
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
109 given firmware build, and we set both of them to disabled in our VPM config.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
111 If one were to enable CSD and/or GPRS in a VPM fw build (once upon a time we had
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 both enabled, when we were using a binary-only version of the protocol stack,
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 with blobs preventing us from changing config options), the resulting firmware
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 components will be dead weight, with no ability to make use of them. In TI's
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 architecture both CSD and GPRS (outside of high-end feature phone configs with
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 built-in TCP/IP, WAP and MMS) are meant to hook up to the AT command interface
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 on the dedicated MODEM UART, complete with data modes, and that part is lost in
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 our VPM arrangement. Therefore, as soon as we deblobbed our protocol stack and
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 regained the ability to change its configuration, we adopted our current
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 approach of building VPM firmware configs with CSD and GPRS excluded.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 Still useful despite the limitations
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 ====================================
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 Despite all of its limitations, FreeCalypso VPM firmware running in aftermarket
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 configurations on Mot C1xx and Pirelli DP-L10 is still useful enough to justify
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 keeping it around, and doing efforts like the present fc-am-toolkit package that
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 aim to make it more accessible to GSM hobbyists, enthusiasts and tinkerers.
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 With FreeCalypso VPM, you can connect to a GSM network as a subscriber using a
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 GSM MS implementation for which you have full source code, as opposed to the
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 usual black box, and you can see everything it does. By watching the debug
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 trace in the rvinterf terminal window or log file, you can observe the MS
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 searching for the network, all of its registration attempts, and then idle mode
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 - you can see how the MS wakes up to listen on PCH, as well as neighbour cell
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 measurements and cell reselection. You can then make test calls and see
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 everything that happens: RACH process, entry into dedicated mode with IMM ASS,
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 subsequent channel assignments or handovers, speech codec selection made by the
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 network etc. Whichever area you are interested in, you can study that part of
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 the source, enable additional traces or make better understanding of the
873d5f33e8f3 doc: beginning with FC-aftermarket-intro
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 existing ones, and even new functionality can be implemented as needed.