Re: SCSI / PCI

On Thu, Jun 25, 1998 at 11:33:21PM -0700, Jeremy Fitzhardinge wrote:
> Yeah, I was forced to stop working on that approach because it broke completely
> when I changed motherboards/bioses. The BIOS32 mechanism which is supposed to
> allow a 32-bit kernel make use of BIOS code is flawed, because there's no way
> of telling what memory it wants access to, so you can't do the appropriate
> mmaps. There's also the secondary problem that you can't identity map all
> parts of the physical address space. I also needed to change the mmap()
> syscall itself to allow the use of MAP_FIXED and MAP_PHYS together, but I
> haven't looked at recent kernels to see if this is still the case.
>
> I suspect that using direct IO to the PCI chipset is more likely to work in the
> VSTa environment.

What current systems actually use BIOS32 to do this anyhow? I am under the
impression that this is usually done by accessing the chipset directly
always.

-- 
David Jeske (N9LCA) + http://www.chat.net/~jeske/ + jeske_at_chat.net