[Bug 255072] boot (legacy): no progress beyond 'BIOS DRIVE D: is disk1'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255072

--- Comment #43 from spell@itl.ua ---
Booting from the image

FreeBSD-14.0-ALPHA4-amd64-20230901-4c3f144478d4-265026-mini-memstick.img

gives the same effect on my HP EliteBook as I've reported previously - reboots
while AHCI mode is set in BIOS settings and boots normally while IDE mode is
set.

Graham, Toomas, while I've started participating in this bugreport with rather
superficial notes but finally I've investigated the bug to the extent I believe
I had found the core issue - this is some bug in BIOS code (the int13h piece).
I tried to show how I've ended up with this conclusion, though probably some
reasons I've missed.

As of a workaround, don't imagine if it is possible though this issue is some
very opaque race condition that is hardly catchable and seems fires up upon
some asynchronous events on the bus from other devices, and it's a pity that it
presents in HP (and, as reported, Dell) products :( (though they may share the
code and consequently the issue).

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