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

[Daniel P. Berrange]

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
iPXE v1.0.0-591-g7aee315
                                 iPXE (http://ipxe.org) 00:03.0 C900 PCI2.10 
PnP PMM+00000000+00000000 C900

                                 Booting from Floppy..
.                                qemu: fatal: Trying to execute code outside 
RAM or ROM at 0x00000001000effff

EAX=ffffffff EBX=ffffffff ECX=0000c934 EDX=00000068
ESI=00006801 EDI=00000000 EBP=0000002b ESP=0000fff5
EIP=ffffffff EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0040 00000400 0000ffff 00009300
CS =f000 000f0000 0000ffff 00009b00
SS =9ec4 0009ec40 0000ffff 00009300
DS =9ec4 0009ec40 0000ffff 00009300
FS =0000 00000000 0000ffff 00009300
GS =0000 00000000 0000ffff 00009300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     000fcd78 00000037
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 
DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
CCS=000000d0 CCD=00000068 CCO=SARL    
EFER=0000000000000000
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
XMM00=00000000000000000000000000000000 XMM01=00000000000000000000000000000000
XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000
XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000
XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000
Aborted


Git bisect blames this

  commit 41bd360325168b3c1db78eb7311420a1607d521f
  Author: Jan Kiszka <address@hidden>
  Date:   Sun Jan 15 17:48:25 2012 +0100

    seabios: Update to release 1.6.3.1
    
    User visible changes in seabios:
     - Probe HPET existence (fix for -no-hpet)
     - Probe PCI existence (fix for -machine isapc)
     - usb: fix boot paths
    
    Signed-off-by: Jan Kiszka <address@hidden>


I tried to bisect Seabios, but every revision in Seabios upstream works
fine.

Then I noticed, that if I rebuild the BIOS, from the exact same revision
1.6.3.1 revision that is committed in 'seabios' submodule in QEMU, then
it works fine. So AFAICT, it is not the Seabios source code at fault,
but rather the binary build we have commited to GIT. Should/can we rebuild
the bios.bin in GIT ?

Regards,
Daniel
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