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

[Bernd Walter]

On Mon, May 05, 2014 at 09:34:48AM -0600, Ian Lepore wrote:
> On Mon, 2014-05-05 at 16:47 +0200, 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.
> > 
> 
> This shouldn't be a problem.  The code that references isa stuff is
> wrapped in #ifdef DEV_ISA, and an arm kernel build won't have that
> defined.  The problem was that the makefile for building a sound module
> created an opt_isa.h containing #define DEV_ISA when building for arm so
> the loadable sound modules had references to isa but the driver in the
> kernel didn't.

Didn't test myself, but this thread started with a problem like this.

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