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SubjectRe: Direct access to hardware
On Tue, 25 Jul 2000, Stuart MacDonald wrote:

> Which is exactly the point. The hard drives should be checking for
> invalid ATA commands in hardware, right in the drive, preventing
> damage from bad commands. Putting a filter into the kernel is not
> the right fix.

As with some of the Intel CPU bugs, the problem is NOT "invalid ATA
commands" - it's a matter of VALID commands which are dangerous. FDIV on
early Pentiums isn't an invalid instruction - it just produces the wrong
results at times. So the SOFTWARE must do something to avoid this - either
that, or you need to replace the hardware, which isn't desirable. You do
something in the OS to prevent these problem commands being used.


James.


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