Re: [PATCH] Configure IDE probe delays

Bartlomiej Zolnierkiewicz
2004-08-27T19:02:07Z

On Friday 27 August 2004 20:08, Lee Revell wrote:
> On Fri, 2004-08-27 at 14:05, Bartlomiej Zolnierkiewicz wrote:
> > On Friday 27 August 2004 19:53, Lee Revell wrote:
> > > On Fri, 2004-08-27 at 13:45, Greg Stark wrote:
> > > > Lee Revell <rlrevell@joe-job.com> writes:
> > > > > I wonder if 83 probes are really necessary. Maybe this could be
> > > > > optimized a bit.
> > > >
> > > > Or if the kernel could be doing something useful during that time. I
> > > > don't suppose it's possible to probe two different ide interfaces at
> > > > the same time, is it?
> > >
> > > Did the patch to move this into a #define ever get merged? Seems like
> > > a no brainer, as it eliminates a magic number.
> >
> > No and it won't because it is not a 'magic number' but rather a 'random
> > number' (see Alan's mail for explanation).
>
> OK, sorry. Missed that one the first time.
>
> > BTW Lee, 48-bit addressing doesn't mean that capacity > 137GB

Contrary is true of course:
if capacity > 137 GB then disk supports 48-bit addressing.

> What determines whether 48 bit addressing will be used then?

Availability of 48-bit addressing feature set and host capabilities
(some don't support LBA48 when DMA is used etc.).