[alsa-devel] alsa on Atmel at91

[Liam Girdwood]

On Wed, 2007-04-18 at 11:18 +0200, Michel Benoit wrote:
> Hello again Liam,
> 
> > Frank has written a codec driver for a dumb BT codec (attached and link
> > below). This could be renamed and with a little string changes could be
> > used as a generic dumb codec driver.
> >
> > http://opensource.wolfsonmicro.com/~lg/tmp/asoc-codec-bluecore.patch
> >
> >
> 
> > I would use the eti_b1_wm8731.c as an example machine driver for your
> > board. You will need to replace any WM8731 references and add your
> > boards own specific clocks, gpio's etc.
> >
> 
> I am able to build a soc driver for my hardware using the bluecore
> codec driver and et1_b1_wm8731 machine code as examples.
> 
> The driver gets recognized by alsa at startup.  The ssc registers are
> set correctly but my original problem still remains.  I can play
> random noise with test/pcm_min but with test/pcm the alsa lib returns
> a period_size of 0, despite the fact I set period_time to 100000.
> 

This maybe related to an ARM gcc bug :-

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27363


> I start to suspect that I have a problem with alsa lib.  How did you
> cross compile alsa lib för the at91?

I use OpenEmbedded for all my cross compiling:-

http://www.openembedded.org/

OE has the bug fix for the above gcc bug in it's toolchain.

Liam