Hi,

Here's a patch for some ALSA sound stuff on O2 with 2.6.12rc2.

I wasn't able to get sound since 2.6.8.1, so I get back Glaurung's 
"sgio2audio" patch  for 2.6.1 and update it to 2.6.12rc2.
Most of the work was to understand how the driver is working and to 
update it according to ALSA API changes
(I'm not used to work on drivers, moreover on ALSA drivers...)

I've just test the chenages and I've been able to play some music with 
xmms. Still glitches... but I'm thinking that some people will be 
interested.

important comments:
- driver can be used as module (modprobe snd-sgi-o2) . Not tested when 
statically linked to the kernel
modprobe may have to be played twice to get the module loaded (seems 
that AD1843 isn't so easy to init)
- need to be compiled with CONFIG_SND_DEBUG, CONFIG_SND_DEBUG_MEMORY and 
CONFIG_SND_DEBUG_DETECT
=> you should be able to get SGI O2 Audio in ALSA mips section
- I didn't (yet) change anything else:
* still glitches. Vivien was talking about DMA issues...
* mixer not available
- I try to reduce created/modified files:
* create include/sound/ad1843.h (also created with 2.6.1 patch)
* change snd/sound/mips/Kconfig (was created by 2.6.1 patch, but now 
this file is also used for Au1x000 )
* change snd/sound/mips/Makefile (was created by 2.6.1 patch, but now 
this file is also used for Au1x000 )
* create sound/mips/ad1843.c and sound/mips/sgio2audio.c (also created 
with 2.6.1 patch)

==
Fred