Re: Why do we probe option roms at 2K boundaries?

[Hans de Goede]

Hi all,

On 07/16/2009 02:08 AM, Dan Williams wrote:
> On Wed, 2009-07-15 at 16:13 -0700, Jon Smirl wrote:
> > On Wed, Jul 15, 2009 at 7:10 PM, Alan Cox<alan@xxxxxxxxxxxxxxxxxxx>  wrote:
> > > > interrogating a data structure stored in option-rom memory.  My initial
> > > > implementation involved blindly scanning from c0000 to f0000 in 512 byte
> > > > increments.  Neil and others pointed out that this may not be a safe
> > > It isn't safe. If you hit certain ISA devices your system will drop dead.
> > > OTOH I doubt anyone has an intel matrix raid controller and a WD80x3 on
> > > the same box ;)
> > Random link from google, slide 21
> > http://download.microsoft.com/download/9/8/f/98f3fe47-dfc3-4e74-92a3-088782200fe7/TWAR05005_WinHEC05.ppt
> >
> > PCI 3.0+ allows 512b alignment, but you must first make sure you are
> > on a PCI 3.0+ system.
>
> Thanks, I believe this may be the missing difference between my test
> system and Hans'.

Probably, I'll happily test any patches for this you come up with, note that I'm
leaving for a week of vacation tomorrow, so it might take some time for me to
get back to you.

Regards,

Hans
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/