On Thu, October 21, 2010 5:51 pm, Rory Filer wrote:
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
the startup log:
Advanced Linux Sound Architecture Driver Version 1.0.18rc3.
ASoC version 0.13.2
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
but I'm just learning all this stuff and can tackle a genuine DAC later
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
NOTE: my kernel has the drivers built-in and not created as modules, if
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,
Linux-audio-dev mailing list
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."