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SubjectRe: Intel microcode fixes [OFF-TOPIC]
On Sun, 22 Nov 1998, David S. Miller wrote:

>Heck, some of us have even us have even successfully uploaded bogus
>microcode to Pentiums while trying to reverse engineer to format...

Fascinating. I read something now at samepile.org about the microcode
undocumented feature. I also downloaded (as always very very very slowly)
some of the (small by luck) 2kbyte microcode updates. There' s also a tiny
DOS proggy that computes the checksum of the microcode update. The only
thing that does is to sum every 32bit data in the raw microcode update and
check that the final result is 0 (I guess this is not the _only_ security
check done by the CPU before trust data ;-).

But where are the BIOSes that has also the asm to upload the microcode?
And more important P5MMX (model 4 stepping 3) can update the microcode? I
read in a news (link from sendpile) that also P5MMX processors would have
the microcode feature...

Andrea Arcangeli


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