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# snd_audiocs:		Crystal Semiconductor CS4231 SBus/EBus.

• #device snd_audiocs

commit log

Device driver for onboard CS4231 audio controller which is found on UltraSPARC workstations. The driver is based on OpenBSD's SBus cs4231 driver and heavily modified to incorporate into sound(4) infrastructure. Due to the lack of APCDMA documentation, the DMA code of SBus cs4231 came from OpenBSD's driver.
The driver runs without Giant lock and supports both SBus and EBus based CS4231 audio controller. Special thanks to marius for providing feedbacks during the driver writing. His feedback made it possible to write hiccup free playback code under high system loads.

Approved by

jake (mentor)

Reviewed by

marius (initial version)

Tested by

marius, kwm, Julian C. Dunn(jdunn AT opentrend DOT net)

$FreeBSD: src/sys/conf/NOTES,v 1.1282 2004/10/25 10:29:55 yongari Exp $