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SubjectRe: Athlon possible fixes
On Sun, May 06, 2001 at 01:51:59PM +0100, Alan Cox wrote:

> > There really needs to be a hardware fix... this doesn't stop some
> > application having it's owne optimised code from breaking on some
> > hardware (think games and similation software perhaps).
>
> prefetch is virtually addresses. An application would need access to /dev/mem
> or similar. So the only folks I think it might actually bite are the Xserver
> people.

Prefetch bugs in hardware have biten Linux/68k as early as '94; a GVP SCSI
HBA on the Amiga may touch areas beyond the last valid RAM address when
doing DMA to the last page. Being a burned child from that time Linux/MIPS
didn't use the last RAM page just to be on the safe side.

Ralf
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