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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.


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