[SeaBIOS] Boot failure with MS-Dos 6.22 (due to bad BIOS build?)

Fred . eldmannen at gmail.com
Wed Feb 29 10:51:07 CET 2012

Modern operating systems does not use BIOS much.
DOS use BIOS a lot.
SeaBIOS is a BIOS, so should be able to run operating systems that use BIOS.
So I think DOS is something that ought to run/work on SeaBIOS if
SeaBIOS implements BIOS correctly.

Shouldn't DOS be some milestone for SeaBIOS?
Perhaps there ought to be a BIOS testsuite to test BIOS compliance.

On Wed, Feb 29, 2012 at 10:19 AM, Daniel P. Berrange
<berrange at redhat.com> wrote:
> On Wed, Feb 29, 2012 at 03:45:13AM -0500, Kevin O'Connor wrote:
>> On Mon, Feb 27, 2012 at 04:25:09PM +0100, Jan Kiszka wrote:
>> > On 2012-02-27 10:51, Daniel P. Berrange wrote:
>> > > I'm seeing current QEMU GIT fail to boot MS-Dos 6.22 with the following
>> > > crash:
>> > >
>> > > # qemu-system-x86_64 -fda ~/MS-DOS\ 6.22.img  -m 1 -curses
>> Does the error persist when run with "-m 2"?  If more memory fixes the
>> issue, then it is likely already fixed in upstream (commit 890d9851).
>> The bugs fixed in that commit are null pointer derefernce errors - in
>> SeaBIOS, a write to "NULL" actually alters the memory at address 0,
>> which can corrupt the interrupt table - these can lead to
>> unpredictable errors, as the timing between when an irq fires and when
>> the corruption occurs can vary.  DOS might overwrite the irq entries
>> with its own settings, and thus depending on timing may cover up the
>> error.  In short, I wouldn't assume the problem is the toolchain.
> The error occurs no matter what '-m XX' setting I give it. I did a git
> bisect across a Seabios GIT from master down torel- and could
> not reproduce it with any BIOS I built myself. Hence the only conclusion
> I could come to is that the QEMU binary was broken in some way.
> Regards,
> Daniel
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