Differential D14341
Add workaround for HP BIOS issues Authored by kevans on Feb 13 2018, 12:56 AM. Tags None Referenced Files
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hrs@ and kuriyama@ have found that on some HP BIOS, a system will fail to boot immediately after installation with the claim that it can't work out which disk they are booting from. They tracked it down to a buffer overrun, and found that it could be alleviated by doing a dummy read before-hand. This patch was originally drafted by kuriyama@. This issue is documented on the wiki here: https://wiki.freebsd.org/HPBIOS3TBHDD
Diff Detail
Event TimelineComment Actions I wonder if the same problem happens if we bzero the v86 struct before our first INTxx call? I know that most online references say only certain registers are used, but maybe HP has some weird extension we're tripping over? In any event, I'm OK with this change, since it has a nice comment. |