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

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

--- Comment #35 from spell@itl.ua ---
(In reply to Toomas Soome from comment #30)
>If the INT call will actually use more of that memory, then we may be in 
>trouble. I guess the only way to detect how much buffer memory was actually 
>used, can be detected by storing know value into entire buffer, and test 
>how big are it is where the buffer is changed.

Can't implement this test because bd_edd_io() does not return (the crash occurs
inside of it), so I can't check the buffer state after this crashing INT.
Is there any way to look into the INT of itself?

>did you see comment in bd_io()?
>It is about proliant and large disk
Can you please explain what a buffer overrun happens on that Proliant and how
does bd_io_workaround() solve the poblem and whether it just alleviates (as
said in the comment) or totally excludes the buffer overrun?

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