[Qemu-devel] qemu FreeBSD/sparc64 host - a bit of debugging

[Juergen Lock]

Hi!

 I'm the FreeBSD qemu port maintainer and don't have a sparc64 box
myself, but Jashank Jeremy (Cc'd) now was so kind to test qemu 0.14.1
on a FreeBSD/sparc64 box booting a FreeBSD 8/i386 install iso using
i386-softmmu and we found two things:

1. The hang people have been reporting seems to be caused by this tb:

        IN: 
        0x000e7a31:  in     $0xb3,%al
        0x000e7a33:  test   %al,%al
        0x000e7a35:  jne    0xe7a31

   i.e. it (the qemu bios I suppose) is waiting for x86 ioport 0xb3
   to become zero.  This port is #defined in hw/apm.c as:

        qemu-0.14.1/hw/apm.c:#define APM_STS_IOPORT  0xb3

   but the definition seems to be used nowhere in that source file.
   Anyone have an idea why this port is never zero on sparc64 hosts
   but seems to be on others?  (endian issue?  uninitialized variable?)

2. Booting the same guest with -no-acpi gets further, bios and
   bootloader messages are printed until it hangs again, this
   time while handling a guest irq 8 which seems to be rtc.

 Maybe this is useful to some... :)

 Thanx,
        Juergen