[LAD] Not Sure How to Proceed

Patrick Shirkey pshirkey at boosthardware.com
Fri Oct 22 01:19:03 UTC 2010

On Thu, October 21, 2010 5:51 pm, Rory Filer wrote:
> Hi
> I'm working on a custom-built embedded platform with the Marvell PXA310
> processor, trying to make one of the SSP outputs work in I2S mode. Today I
> managed to get everything to compile and boot, but nothing appears in
> /dev/audio and I'm not sure what to do next.

What about /proc/asound  ?

> Here's the relevant portion
> of
> the startup log:
> Advanced Linux Sound Architecture Driver Version 1.0.18rc3.
> ASoC version 0.13.2
> littleton_init
> Dummy(Codec) SoC Audio Codec
> Littleton init done: 0
> ALSA device list:
>   No soundcards found.
> In this log, "littleton" is the machine level driver which I believe is
> analogous to Corgi.c or spitz.c My hardware platform has no actual CODEC
> chip so I created a dummy one and then made all the functions return zero
> (i.e. return 0) to fool the system into thinking there actually was a DAC
> present. In other words, my hardware consists of the Marvell CPU with its
> I2S output feeding into an external chip that will take this audio and
> (hopefully) play it. That external chip is not a DAC. I know it's
> primitive,
> but I'm just learning all this stuff and can tackle a genuine DAC later
> on.
> Since most of the SoC code I've looked at uses an external chip for the
> I thought this architecture would work, although it may not be very
> practical.
> NOTE: my kernel has the drivers built-in and not created as modules, if
> that
> matters.
> I think I must be close to being able to play a tune through this devkit,
> but I don't know what I'm missing. I'd appreciate any suggestions,
> Cheers All
> Rory
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> Linux-audio-dev at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-dev

Patrick Shirkey
Boost Hardware Ltd.

"ZPE is not about creating something from nothing: It is about using the
zero point of a wave as a means to transform other forms of potential
energy like magnetic flux, heat, or particle spin into usable energy in
such a way that entropy appears to be reversed."

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