Alsa on H5550 - What works? How to get it working?

We have an IPAQ H5550 for a Voice over IP project. We bought this model
because of the Wifi plus PCMCIA socket etc. We have an audio
capture/play daemon written to work with Alsa. This works perfectly on
2.6 Kernels on other machines but not on 2.4 Kernels on the IPAQ. I have
not found a usable 2.6 kernel for this IPAQ yet?

Originally we had what I think was 0.8.1 (might have been even older)
running with Alsa and it sort of worked - we could talk/hear but the
quality was not good and the CPU was at100%. We traced the issues to a
spinning problem in the 2.4 Kernel/Alsa but no further (did not solve
it). We use "poll" for all control in our system as we need to process
4 interrupt driven devices concurrently - 2 of which are the sound in/out.

We have since tried to get the audio working on later versions in the
hope that the spinning problem may have been resolved. Tried 0.8.2 with
no success and now have 0.8.3. On neither of these devices have we
managed to get Alsa to work with the seemingly quite well known
"plughw:0.0" device not found error. I have been playing with the
modules to try and remove this issue but with no success.

** Does anyone have a module list "/sbin/lsmod" that works with Alsa?
Also which kernel you are running?

** Does anybody have Alsa working on 0.8.3? 0.8.2?
If so, can you tell me what you loaded and how you configured it. I
currently believe that some of the OSS modules may need to be removed to
get Alsa working?

I have a full compile chain and have compiled my own kernel and most of
Alsa. I have not been able to get a clean compile of the alsa-driver
package. I have been using the
alsa-driver-2.4.19-rmk6-pxa1-hh37_0.9.6-hh4c-r5_h3600.ipk downloaded
from the 0.8.3 feeds but am running an h39 kernel! The source for this
does not currently compile with the latest kernel hh39. There are config
and compile errors once the main config ones have been fixed. e.g.. in
acore/hwdeps.c the include files suck in two different definitions of a
"tq_struct" from different places!

I can supply more details if anyone can help.

With thanks

Nick

-- 
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Dr Nick Filer. Room: IT405, School of Computer Science, University of 
Manchester, Manchester M13 9PL, UK.        Telephone: +44-161-275-6171
FAX:       +44-161-275-7275
Email:     nfiler_at_cs.man.ac.uk                                
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