FreeBSD 5.4-STABLE: DVD in PIO mode?

David O'Brien obrien at
Fri Apr 8 10:54:52 PDT 2005

On Wed, Apr 06, 2005 at 06:00:55PM +0200, O. Hartmann wrote:
> Hello.
> After I did a cvsupdate today and recompiled world/kernel, I realized
> that DVD/CDROM now is by default in PIO mode 4. I have to bring them
> back to DMA explicitely by setting hw.ata.atapi_dma="1" in
> /boot/loader.conf.local.

This is correct for RELENG_5 (ie, about to become 5.4-RELEASE) on
Sparc64, and all architectures IIRC.  There are too many problematic
ATAPI CD/DVD drives out there.  Defaulting to ATAPI DMA makes FreeBSD
uninstalable on them with knowing the magic invocation.

-- David  (obrien at

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