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Date: Sun, 26 Nov 2006 00:10:30 +0100 (MET)
From: Michiel Boland <michiel@boland.org>
To: John Baldwin <jhb@freebsd.org>
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Cc: freebsd-amd64@freebsd.org
Subject: Re: BTX halted trying to boot X4100 from disk
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On Mon, 13 Nov 2006, John Baldwin wrote:

> On Monday 13 November 2006 15:12, Michiel Boland wrote:
>>> Yeah, the X4100 has an mpt(4) controller. Mine is running the original
> BIOS
>>> release (6464), and runs FreeBSD fine. You can try fiddling with the BIOS
>>> revision by downloading replacements from Sun's website.
>>
>> As far as I can see there are no other BIOSes on the Sun website other
>> than what the box is already running (ILOM 1.0.7 - I understand ILOM and
>> BIOS are linked for 4100s)
>>
>> I am a bit puzzled why solaris and fedora do not have these problems on
>> this hardware. Oh well...
>
> The real mode breakpoint handler may just ignore breakpoints, or the BIOS
> takes a different codepath when it runs in vm86 mode.

The code path is the same. The bios calls INT3 if someone tries to load a 
block with LBA < 16, or LBA 64 or 65. (I think - my asm skills are a bit 
rusty.)

Is there not a way for BTX to ignore these INT3 interrupts? Obviously they 
are ignored in real mode too.

Cheers
Michiel