Date: Sun, 25 May 2008 20:33:01 +1200 From: Mark Kirkwood <markir@paradise.net.nz> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: BTX loader hangs after version info Message-ID: <4839243D.7000700@paradise.net.nz> In-Reply-To: <48390FA9.5080503@paradise.net.nz> References: <720051dc0805220159n23eb6205yfcf9450be7af5c77@mail.gmail.com> <200805230829.09524.jhb@freebsd.org> <20080523132645.GO29770@deviant.kiev.zoral.com.ua> <200805231811.01936.jhb@freebsd.org> <48390FA9.5080503@paradise.net.nz>
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I wrote: > John Baldwin wrote: >> >> Try this patch. I'm not 100% certain this will fix it as I can't >> reproduce >> the issue, but I think it might help. Specifically, when the boot >> code makes >> a v86 call, the loader/boot2/whatever swaps in/out a new set of >> registers via >> the v86 structure including the eflags register. However, none of >> the boot >> programs actually initialized the v86 structure. Thus, the BIOS >> routines >> would start off running with whatever garbage was in v86.efl when >> each boot >> program started. This meant that we could end up invoking BIOS >> routines with >> interrupts disabled, and I think this might explain a hard hang (if a >> BIOS >> routine was waiting for an interrupt the interrupt would never >> fire). The >> patch fixes all the boot programs to initialize v86 to a better known >> state. At the least it sets v86.efl to a sane value (0x202) rather >> than random. (The >> random might have always been 0x0 BTW, not sure on that one.) >> >> > Thanks John, > > Unfortunately this patch does *not* cure the issue for my old > Supermicro P3TDDE, it still hangs just before presenting the menu. I > had to boot off the livefs and copy /boot/loader.old -> /boot/loader > to get back to being bootable again - but at least the old fella is on > a more up-to-date 7-STABLE now :-) Given that the patch *did* cure Peters Tyan S2720, I'll double check I didn't fat finger applying the patch (mind you the Tyan has AMI BOIS - same as my Supermicro P3TDERs that *do* work ok with current 7-STABLE, whereas the P3TDDE has Award BIOS). Anyway, I'll double check and report back... Cheers Mark
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