Messages in this thread | | | Date | Mon, 23 Nov 1998 00:47:33 +0100 (CET) | From | Andrea Arcangeli <> | Subject | Re: 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
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |