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

[Scott Aitken]

Hi all,

I'm hoping to use my RPi/FreeBSD as an Airplay device to my amplifier which
presents a USB DAC.

uname: FreeBSD raspberry-pi 10.0-STABLE FreeBSD 10.0-STABLE #0 r263906: Sat Mar 29 20:13:51 UTC 2014 root at grind.freebsd.org:/usr/obj/arm.armv6/usr/src/sys/RPI-B  arm

DAC in dmesg: uhid0: <danyigao audio equipment DARED AUDIO, class 0/0, rev 2.00/1.00, addr 4> on usbus0

When I try to load snd_uaudio:
root at raspberry-pi:~ # kldload snd_uaudio
kldload: can't load snd_uaudio: No such file or directory

dmesg:
link_elf: symbol isa_dmastatus undefined
KLD snd_uaudio.ko: depends on sound - not available or version mismatch

The kernel modules are there in /boot/kernel.

If I try to load sound.ko:

root at raspberry-pi:~ # kldload sound.ko
kldload: can't load sound.ko: No such file or directory

dmesg:
link_elf: symbol isa_dmastatus undefined

Is sound.ko supported under RPi or am I doing something wrong here?

Thanks in advance,
Scott