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

[Bernd Walter]

On Mon, May 05, 2014 at 10:37:09AM -0700, John-Mark Gurney wrote:
> Hans Petter Selasky wrote this message on Thu, May 01, 2014 at 17:08 +0200:
> > 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.
> > 
> > Hi,
> > 
> > I'll have a look and see if I can fix it.
> 
> So, I have both a BBW and a BBB and both devices don't have working
> USB...  If I plug in a device, like a uftdi serial adapter, the blue
> light flashes briefly but then stays off... It should stay on...

AFAIK we don't switch any LED at all, so this probably is a power problem.
What rating has your power supply?
Do you use the barrel or USB plug to power the board?
I think you need to use the barrel plug for additional load, since
the board has some kind of current limitation for the USB connector.

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