b43: Debugging PHY TX errors

[Michael Buesch <mb@bu3sch.de>]

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I hacked up some scripts for debugging of the PHY transmission
errors. It consists of two parts. One patch that has to be applied
to the kernel driver (latest wireless-testing!) and one firmware
binary patcher script (for latest supported firmware only!)

Both are included in the attached tarball. Extract the tarball.

So you first have to apply the included "b43-kernel-patch.patch" to
the kernel driver and recompile your kernel.
Then you have to patch your firmware by doing:

cd phyerr-patcher-001
bash ./patch-phyerr-logger.sh /lib/firmware/b43/ucode5.fw

You might have to adjust the path to your firmware.
On successful patching, the script will exit with a nice smilie: :)


So when running the modified driver with the patched firmware, it should
dump the shared memory every time a PHY error occurs.
More state dumps can be added to the kernel driver. The firmware is halted
while the phyerr logger function is running, so state should be consistent.

WARNING: This patch might kill your cat, or at least disturb your wireless
connectivity. Only use it for debugging the PHY transmission errors.

Note that these scripts require a complete compiler toolchain, including
flex and bison, on your machine, as it will compile the assembler and
disassembler tools.

-- 
Greetings Michael.

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