[maemo-developers] kernel patches, Re: DSP framebuffer access on N8x0

[From: nick loeve]

Hi,

On Wed, Apr 30, 2008 at 10:17 AM, Frantisek Dufka <dufkaf at seznam.cz> wrote:
> Simon Pickering wrote:
>> This requires two things, a kernel patch, and adding a FRAMEBUFFER section
>> to the /lib/dsp/avs_kernelcfg.cmd file. See
>> https://bugs.maemo.org/show_bug.cgi?id=3123 for the patch.
>
> Nice. I've been thinking about garage project named kernel-hacks or
> something, that would accumulate interesting kernel patches and even
> have some pre-built kernels with those patches applied.
>
> The reason is that there are already quite a few interesting kernel
> patches and it is hard to keep track of them. Of course it would make
> sense only if people doing some kernel hacking would actually join such
> project and submit patches and optionally build kernel images with some
> subset or all the patches.
>
> Opinions? Is it needed? Would you (actively) participate? Any better
> solutions (git tree)? Or we can still keep them scattered across
> bugzilla and internet.
>
> So far I know about following additional patches (feel free to add other
> stuff I missed, as I said it is hard to track all of them):
>
> - framebuffer rotation
> http://sse2.net/rotate/
> http://labs.vivi.eng.br/blog/?p=39
>
> - japanese FM bands for N800 tuner
> https://bugs.maemo.org/show_bug.cgi?id=2249
>
> - high speed (48MHZ) SD/MMC
> http://intr.overt.org/blog/
>
> - patches that run N8x0 DSP/CPU at 133/400 when playing audio
>
> - my (mostly 770) stuff - extended brightness control, mmcplus, sdhc,
> tearsync, yuv420 mode
> http://fanoush.wz.cz/maemo/

We could also include the following patches that backport kprobes for
the 2.6.21 osso kernel:

http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=4447
http://www.kernel.org/pub/linux/kernel/people/eugeneteo/kprobes/kprobes-arm-cleanup-2.6.21.4-A1

I have been using them for running systemtap in mamona

>
> Some of them could be merged to mainline or Nokia kernel but many of
> them are just quick hacks of debatable value and correctness with little
> chance of merging to some official tree.
>
> Maybe some public GIT tree would be better but I'm not familiar with
> GIT. And also I don't have 24/7 online server for this anyway.
>
> I also thought about starting someting similar directly on
> http://fanoush.wz.cz/maemo/ but I don't want to hijack other people's
> stuff and it is free hosting so it is not safe, it can vanish anytime.
> Also recently I have become a bit slow due to busy real life so having
> more people for maintenance would be nice :-)
>
> Frantisek
>
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-- 
Nick Loeve