[ts-7000] Alsa on TS7400

["Michael DeGroot" <>]

I have been working on installing a USB alsa driver for a while now.  I have gotten to the point where I am able to play a sound using aplay.  However, most of the time, I get one of these errors:

underrun!!! (at least 
350.000 ms long)
aplay: xrun:1093: read/write error, state = PREPARED

or

pcm_write:1268: write error: Input/output error

The audio abruptly stops when these errors occur.

--

The general procedure I followed to get to this point was:
1.  Install kernel sources onto a cross compiler system.
2.  make ts7400_config, make oldconfig, make config (adding CONFIG_SOUND), make modules, make modules_install (with an alternate path)
3.  copy soundcore.o
 to ts7400 and place in modules sound/2.4.26-ts11/kernel/sound directory.  Load with insmod

I had an issue with building alsa on the crosstools system, so I copied the source and alsa source to the SD card to build directly on system.

I built per these instructions found on this forum:

=======
This is what i did. First i get alsa-driver 1.0.4 from

  http://arm.cirrus.com/files/index.php?path=linux%2Fpackages/

then i modify include/config.h
and add this lines
#define CONFIG_HAVE_PDE
#define __WORK_INITIALIZER

and then change acore/misc.c
in line 225
works->func(works->data); to works->routine(works->data);

then just do
./configure --with-cards=usb-audio --with-sequencer=yes/no (this for
midi i think) --with-kernel=PREFIX/linux(
2.4.26-ts11 sources)
--with-cross=(if u use crosstools)
make
make install
=========

I also ran ./snddevices and loaded the modules with insmod as necessary.

To add additional strangenesss, the aplay will always work if I type random garbage into the terminal window (or hold down a key).  It will sometimes work properly, but will often fail.

I am not sure how to proceed further on this.  I believe part of the problem could be I am not installing the modules properly, or that I need additional kernel modules to support alsa.

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