problem with UDMA mode on XP1000
Andrew Gallatin
gallatin at cs.duke.edu
Wed Apr 16 12:03:51 PDT 2003
Jarkko Santala writes:
> On Wed, 16 Apr 2003, Andrew Gallatin wrote:
>
> >
> > Jarkko Santala writes:
> > > I suppose no checking explains the performance. ;) But good to know
> > > anyway. Any reason why it gets enabled by default if its not safe?
> >
> > The ata code just enables the highest available mode by default.
> >
> > I'm no expert, but I don't think PIO is safe either. I think it just
> > stresses things so much less than DMA that its assumed to be safe. Drew
>
> How about adding all this into the alpha Hardware Notes?
>
Its not alpha specific...
Drew
More information about the freebsd-alpha
mailing list