[LinuxBIOS] LBv3 under Bochs

[Carl-Daniel Hailfinger]

Hi,

since Qemu can't boot Windows Vista reliably and Bochs can, I wondered
whether Bochs can run LinuxBIOS v3. Patrick Georgi tried it and even got
to the GRUB2 welcome screen, where it crashed with a triple fault.

This is what Patrick wrote in IRC:
> http://openbios.org/~oxygene/lbv3.bochs is the config I used (to be
> started from lbv3's root directory)
> it's configured to send serial0 to /dev/stdout
> I get "Welcome to GRUB!" now, but then it crashes on a triple fault :)
> http://pastebin.com/m749c3e36 bochs output

Will we try to get LBv3 running in Bochs?
Benefits would be:
* One more soft hardware platform to test code with (although the
emulated hardware is very similar to that of Qemu)
* Bochs seems to support Vista and we may have success running Vista
with LBv3 in Bochs

Regards,
Carl-Daniel

[Patrick Georgi]

Carl-Daniel Hailfinger schrieb:
> This is what Patrick wrote in IRC:
> > http://openbios.org/~oxygene/lbv3.bochs is the config I used (to be
> > started from lbv3's root directory)
> > it's configured to send serial0 to /dev/stdout
> > I get "Welcome to GRUB!" now, but then it crashes on a triple fault :)
> > http://pastebin.com/m749c3e36 bochs output
>
> Will we try to get LBv3 running in Bochs?

Some more information (Thanks to Peter, who found that piece):
(excerpt from the paste bin above):

00027185764i[CPU0 ] |  CS:0010( 0002| 0|  0) 00000000 000fffff 1 1
00027185764i[CPU0 ] |  DS:0018( 0003| 0|  0) 00000000 000fffff 1 1
00027185764i[CPU0 ] |  SS:0018( 0003| 0|  0) 00000000 000fffff 1 1
00027185764i[CPU0 ] |  ES:0018( 0003| 0|  0) 00000000 000fffff 1 1
00027185764i[CPU0 ] |  FS:0018( 0003| 0|  0) 00000000 000fffff 1 1
00027185764i[CPU0 ] |  GS:0018( 0003| 0|  0) 00000000 000fffff 1 1

Those should be (00000000,ffffffff), but aren't on bochs.
On qemu they _are_ all set to (00000000,ffffffff).
But I have no idea what the reason could be and no time to debug it at 
the moment.

Regards,
Patrick Georgi

[ron minnich]

I used to boot just fine on bochs and in fact I think I did today, but
am not certain :-)

Yes, booting under bochs is really valuable!

ron

[Carl-Daniel Hailfinger]

On 09.08.2007 23:27, ron minnich wrote:
> I used to boot just fine on bochs and in fact I think I did today, but
> am not certain :-)

Hm. Can you post your bochs config? And was this with v2 or v3?
> Yes, booting under bochs is really valuable!

I'll prepare a patch to say so in Kconfig in v3.

Regards,
Carl-Daniel