It seems Peter Jeremy wrote:
> I just discovered that my ATAPI CD-ROM is no longer usable - when I
> try to mount it, my maching hangs (hard).
>
> I'm running -current from cvs-cur 5961 (Monday about 0000UTC).
>
> The symptoms are:
>
> Run "mount -r /dev/acd0c /cdrom"
> The CD-ROM activity light flashes briefly and the CD-ROM spins up.
> The activity light then goes hard on for something like 20 seconds.
> The kernel then prints:
> acd0: atapi_timeout: cmd=READ_BIG - resetting
> ata0: resetting devices .. _
> The cursor remains at the end of the line ("_" above). The CD-ROM
> spins up and down. The HDD light stays hard on.
> acd0: <CD-ROM CDU611/2.0a> CDROM drive at ata0 as slave
> acd0: read 1723KB/s (1723KB/s), 256KB buffer, DMA
^^^
You have enabled ATAPI DMA in your kernel config, dont, your
drive apparently doesn't support it.
DMA on ATAPI devices is disabled as default because _lots_ and I mean
_lots_ of ATAPI devices claim to do DMA, but they actually dont :(
-Søren
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