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Date: Fri, 02 May 2014 18:00:51 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: Johny Mattsson <johny.mattsson+fbsd@gmail.com>, 
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Subject: Re: USB audio device on Raspberry Pi - link_elf: symbol isa_dmastatus
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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@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.
>
> Hi,
>
> I'll have a look and see if I can fix it.
>
> --HPS

Hi,

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.

--HPS