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

[Bernd Walter]

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.

-- 
B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.