Messages in this thread | | | Subject | Re: Why do we probe option roms at 2K boundaries? | From | Dan Williams <> | Date | Wed, 15 Jul 2009 17:08:53 -0700 |
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On Wed, 2009-07-15 at 16:13 -0700, Jon Smirl wrote: > On Wed, Jul 15, 2009 at 7:10 PM, Alan Cox<alan@lxorguk.ukuu.org.uk> 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'.
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