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From: Hans Petter Selasky <hselasky@c2i.net>
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Subject: Re: usbaudio on FreeBSD/Raspberry PI
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On Sunday 07 October 2012 14:15:39 MIHIRA Sanpei Yoshiro wrote:
> Hi,all
> 
> I'm trying to use usb-audio device on FreeBSD/Raspberry PI
> 
> However I can't use that with below message(I can use that device on
> FreeBSD/i386).
> 
> pcm0: chn_init(pcuaudio_mixer_write_cfg_callback:
> m0:play:dsp0.p0) fuaudio_mixer_write_cfg_callback:
> ailed: err = 19
> puaudio_mixer_write_cfg_callback:
> cm0: pcm_chn_create(ua_chan, 1, 0xc10f2400) failed
> uaudio_chan_init: endpoint=0x85, speed=48000, iface=2 alt=1
> uaudio_chan_init: could not allocate USB transfers!
> pcm0: chn_init(pcm0:record:dsp0.r0) failed: err = 19
> pcm0: pcm_chn_create(ua_chan, -1, 0xc10f2400) failed
> 
> If someone know the reason, please let me to know.

This configuration is not supported, because it requires 1000 or more IRQ's 
per second, and that consumes very much CPU to do very little. However, it is 
possible to un-comment some code in controller/dwc_otg.c to try it out.

--HPS