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

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

--- Comment #32 from spell@itl.ua ---
(In reply to Toomas Soome from comment #30)
> just remind me, what version of freebsd is this, current?
12.3. Initially I started with 13.0 and noticed that visually its loader
crashes the samely as 12.2's does (and later as 12.3 does), and I've stuck with
the 12.3.

> So virtual 0xffffe000 is physical 0x00008000
Got it, thank you.

> So, if the INT will write past 0x8000 + 0x1000, it will corrupt BTX;
This never happens in my experiments (or goes seamlessly). Using V86_IO_BUFFER
always is successful.

> if INT will write past end of bio_buffer, it will corrupt next variable in BSS.
If no buffer overrun when using V86_IO_BUFFER (that is 4K large), how can it
happen when using bio_buffer (that is 16K large) if all other conditions are
the same?

Also I am trying to decrypt the symptom that the crash occurs not in the same
point of loader run. Seems that the bio_buffer area is somehow used by BIOS
concurrently with using it by v86int() (just to remind - the loader crashes
only when AHCI mode set in BIOS settings), or the INT runs somehow differently
depending on IDE/AHCI mode.

-- 
You are receiving this mail because:
You are the assignee for the bug.