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

[John-Mark Gurney]

Bernd Walter wrote this message on Mon, May 05, 2014 at 20:27 +0200:
> 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?

2A 5V..

> Do you use the barrel or USB plug to power the board?

Yes...

> 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.

Oh, just decided to "eliminate" the power problem, and I pluged in
a USB powered hub...  This time the light stays on on the serial
adapter, but neither the hub, nor the serial adapter is seen by the
BBB...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."