Karthik DK wrote:
>
> Hi all
> I was trying to get the sound working for my assabet+neponset board.
> Whenever I try "dd if=/dev/dsp of=/dev/dsp bs=8192", it produces a
> hissing noise.
> When I try to play a wav file using the splay utility, it again produces
> a hissing noise, but what is interesting is that it produces some sound
> at the very end. I am not able to figure out why this is happening.
> Could someone tell me how to go about debugging this?
I had similar problems a few weeks ago and posted this to "sa1100-linux and
"linux-arm-kernel" lists:
"George G. Davis" wrote:
> I'm checking my hardware revs and ECO's.
Thanks (again) to John Dorsey's "ARM Linux on Assabet" online documentation
available at:
http://www.cs.cmu.edu/~wearable/software/assabet.html
I've found that my Neponset was missing an ECO of an ECO which is not mentioned
in the Intel spec updates for Neponset. Move one green wire 0.100" to enable
sound! : ) Refer to "Section 5 Fixing Neponset" at the above URL for details.
~~~~~~~~
Read section 5 for instructions on fixing your Neponset. You'll need a soldering
iron. (If you choose to perform this repair, I accept no liability for any damage
you cause. Proceed with caution! ; ).
> If I try "cat /dev/sndstat" I get
> /dev/sndstat: no such device.
> According to the Sound-HOWTO, this must give the specs of the card, and
> such an error message means that the driver is not loaded. What I am
> confused abt is how does it produce a hissing noise without the driver
> being loaded? and why does it play the last bit ?
>
Ditto here, I've asked the same question but haven't heard any feedback. It would
be nice if it did list the driver info as described in the HOW-TOs (volunteers?).
But the driver does indeed work regardless of this missing feature. So this is
really just a missing piece of fluff!
> I have set the following options in the linux/arch/arm/defconfigs file
> CONFIG_SOUND=y
> CONFIG_SOUND_UDMA1341=y
That's all you need.
> All others are not set.
> (Should I set CONFIG_OSS_SOUND? Setting this did not help.)
No!
> It is the same in linux/arch/arm/def-configs/assabet and neponest files.
>
> Im not sure if there are any other places where I should change the
> options.
>
> I looked through the archives of the list and a couple of others faced
> the same problem. But it was not mentioned what they did to correct the
> problem.
Did you see "Newbie question on Neponset sound support" in the "sa1100-linux"
and "linux-arm-kernel" lists?
> Any help would be appreciated.
>
> Thanks in Advance
> Regards,
> KAR.
> Graduate Research Assistant
> Dept of EE - Systems
> University of Southern California
> Los Angeles
> CA - 90089.
>
> _______________________________________________
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> Please visit the above address for information on this list.
--
Regards,
George
P.S. Watch the "linux-arm-kernel" and "sa1100-linux" lists for an update on how
to fix audio distortion and crashes when using Neponset PCMCIA concurrently
with USB OHCI and/or UDA1341 driver support loaded. If you have this problem,
get the latest Assabet control CPLD files from developer.intel.com and update
your Assabet control CPLD. If you don't have this problem, you're fortunate
to either have new Assabet hardware (with the latest CPLD code) or you knew
enough to update the CPLDs in the first place. Shame on me for missing this!
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