FreeCalypso > hg > freecalypso-hwlab

annotate linux-patch/README @ 150:54e33e9238b6

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
fc-simtool: harmonize hex string code with fc-uicc-tool
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 07 Feb 2021 00:06:50 +0000
parents 95c2a67e1219
children b8473892b0ce
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
83
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 This directory contains several versions of the Linux kernel ftdi_sio driver
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 patch that adds support for FreeCalypso DUART28C adapter, i.e., the optional
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 configuration of DUART28 with boot control outputs.
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 The version in the orig-202007 directory was produced at the end of 2020-07,
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 when DUART28 hardware was still being designed; this original version of the
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 patch was created to test the idea and to prove it working (using a generic
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 FT2232D board and an oscilloscope), and it was created with the mindset of a
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 hardware engineer, rather than that of Linux kernel maintainers. This original
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 patch version was made against kernel version 4.4.14 (the version used by the
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 Mother), and it predates all later mainline submission and integration attempts.
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 A patch series against then-current mainline was submitted to ftdi_sio driver
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 maintainer Johan Hovold in 2020-09 for inclusion in mainline Linux. The
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 preliminary patch adding support for FreeCalypso JTAG+UART USB ID codes was
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 readily accepted and has since been propagated to several stable kernel branches
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 (4.4.240, 4.9.240, 4.14.202, 4.19.152, 5.4.72, 5.8.16, 5.9.1 and mainline 5.10),
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 but this patch by itself does not help in any way with DUART28C support. The
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 remaining two patches from the original 2020-09 patch series (a preliminary
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 patch fixing an oversight in the quirk interface and then the main patch of
128
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
21 interest) were met with resistance, however - please see the article in
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
22 doc/Linux-DTR-RTS-flaw for the full explanation. The short version is that
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
23 Linux kernel maintainers are refusing to accept our patch on the basis of their
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
24 assininity, and thus We The End Users will need to apply this patch locally on
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
25 our own systems, probably forever, or at least for the next few billion years
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
26 until the Sun swells into a red giant and engulfs the Earth.
83
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 3 end user patch series versions are presented in minpatch-4.4.14,
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 minpatch-4.4.240 and minpatch-4.9.240. 4.4.240 and 4.9.240 already include the
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 preliminary JTAG+UART USB ID code support patch (which serves mainly as an
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 anchor marking the place where the new DUART28C USB ID code needs to go in
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 ftdi_sio_ids.h and in the ftdi_sio.c ID code table), but 4.4.14 predates this
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 patch by a few years, thus minpatch-4.4.14 includes a backport of this
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 preliminary patch as well. After this preliminary patch, each minpatch-*
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 version includes the quirk port_probe patch and the main patch adding DUART28C
d7a1e7a6d6ba linux-patch: current best offering of minpatch-*
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 support with the needed quirk. These latter patches are the closest version we
128
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
37 ever got to a mainline-acceptable state: they already underwent rounds of
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
38 revision in response to the maintainer's criticism, addressing and fixing
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
39 various nitpick issues before the whole idea got shot down on more ideological
95c2a67e1219 doc, linux-patch: update for failure to mainline DUART28C support
Mychaela Falconia <falcon@freecalypso.org>
parents: 83
diff changeset
40 grounds.