On Wed, Oct 05, 2011 at 10:25:52AM +0200, Manuel Bouyer wrote:
> On Wed, Oct 05, 2011 at 03:40:18AM +0000, Jonathan A. Kollasch wrote:
> > Module Name: src
> > Committed By: jakllsch
> > Date: Wed Oct 5 03:40:18 UTC 2011
> >
> > Modified Files:
> > src/sys/dev/ata: wd.c
> >
> > Log Message:
> > Limit wd(4) transfers to 128 (512-byte) logical sectors, as the traditional
> > MAXPHYS value has for at least the past decade.
>
> We should be able to go safely up to 256 sectors. Anything larger requires
> LBA48, which is not supported by some controllers.
Do we know how a real ST506 or similar ancient drive would respond
to such a command? Then again, maybe we shouldn't care until someone
reports it doesn't work. Currently we limit transfers to 255 sectors.
Presumably we're assuming that the register value of 0 used for 256
might be mishandled.
Jonathan Kollasch
