Re: BTX loader hangs after version info

On Sun, May 25, 2008 at 08:33:01PM +1200, Mark Kirkwood wrote:
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

I did 18 boots with and with out John's patch. With the patch I got 6
actual boots and 12 hangs in the loaders progress bar.

Without the patch I got 10 boots and 8 hangs.

But, my Tyan M/B is old and with known ACPI issues so I'm not sure if
this is of much value.

Mark, it would be nice if you also observe if a sequence of reboots
eventually boots your system. My longest bad streek was 8 reboots.

- Peter
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