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From: "Sebastian Herbszt" <herbszt@gmx.de>
Date: Thu, 19 Nov 2009 22:30:20 +0100
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Subject: [Qemu-devel] POST failure (loop) with isapc and seabios
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To: qemu-devel@nongnu.org
Cc: Kevin O'Connor <kevin@koconnor.net>

i386-softmmu/qemu -M isapc -bios pc-bios/bios.bin

(qemu) info cpus
* CPU #0: pc=0x000f3852
(qemu) x/20i $pc
0x000f3852:  mov    0xfd408,%eax
0x000f3857:  cmp    %eax,%edx
0x000f3859:  jne    0xf3852
0x000f385b:  mov    %ecx,0x10000
0x000f3861:  mov    %ebx,0x10004
0x000f3867:  xor    %eax,%eax
0x000f3869:  cmpl   $0x0,0xf78ec
0x000f3870:  je     0xf3897
0x000f3872:  mov    $0x510,%edx
0x000f3877:  mov    $0xf,%eax
0x000f387c:  out    %ax,(%dx)
0x000f387e:  mov    $0x11,%dl
0x000f3880:  in     (%dx),%al
0x000f3881:  mov    %al,0xe4(%esp)
0x000f3888:  in     (%dx),%al
0x000f3889:  mov    %al,0xe5(%esp)
0x000f3890:  mov    0xe4(%esp),%eax
0x000f3897:  movzwl %ax,%eax
0x000f389a:  mov    %eax,0xfd40c
0x000f389f:  test   %eax,%eax

Could be smp_probe():

    // Wait for other CPUs to process the SIPI.
    if (CONFIG_COREBOOT) {
        msleep(10);
    } else {
        u8 cmos_smp_count = inb_cmos(CMOS_BIOS_SMP_COUNT);
        while (cmos_smp_count + 1 != readl(&CountCPUs))
             ;
    }

Works with pcbios.bin.

- Sebastian