USB audio device on Raspberry Pi - link_elf: symbol isa_dmastatus undefined

[Hans Petter Selasky]

On 05/05/14 16:47, Bernd Walter wrote:
> On Mon, May 05, 2014 at 04:33:56PM +0200, Hans Petter Selasky wrote:
>> On 05/05/14 15:50, Matthias Meyser wrote:
>>>
>>> Am 02.05.2014 18:00, schrieb Hans Petter Selasky:
>>>> On 05/01/14 17:08, Hans Petter Selasky wrote:
>>>>> On 05/01/14 01:34, Johny Mattsson wrote:
>>>>>> On 1 May 2014 00:14, Ian Lepore <ian at freebsd.org> wrote:
>>>>>>
>>>>>>> I was doing some testing on a wandboard (about twice as fast an an
>>>>>>> rpi)
>>>>>>> with
>>>>>>> more than 20k int/sec without having any problems.
>>>>>>>
>>>>>>
>>>>>> On a similar note, I've pushed an i.MX 283 (400MHz) board to above 300k
>>>>>> int/sec, on Linux. Admittedly at that point my shell wasn't what you'd
>>>>>> call
>>>>>> "responsive" however =) The ISR in that scenario was the GPIO
>>>>>> handler, so
>>>>>> probably a bit more light-weight than an audio ISR.
>>>>>
>>>>> I'll have a look and see if I can fix it.
>>>> Here is a patch (work in progress) which you can try:
>>>> http://home.selasky.org:8192/dwc_otg_isoc_support_wip.diff
>>>>
>>>> Still not working 100% reliable. Trying to figure out the last bits
>>>> and pieces.
>>>
>>> For testing it would be very helful if someone could add
>>>
>>> device sound
>>> device snd_uaudio
>>>
>>> to RPI-B kernel.
>>>
>>> Having this in BEAGLEBONE would be nice to.
>>> Perhaps this schould go in every config that supports usb.
>>>
>>
>> Hi,
>>
>> The following patch should make "devd" load sound.ko and snd_uaudio.ko
>> automatically:
>>
>> http://svnweb.freebsd.org/changeset/base/265359
>
> This won't work unless sound.ko especting ISA in ARM kernel is fixed
> as well.
>

Hi,

I think sound.ko does not depend on ISA currently. Maybe that is a bug, 
because ISA is not a module, but in the kernel typically.

dev/sound/isa/sndbuf_dma.c      optional sound isa

With my RPI snd_uaudio loads like expected now.

--HPS