[SeaBIOS] VM won't start since 76e58028d28e78431f9de3cee0b3c88d807fa39d

Gerd Hoffmann kraxel at redhat.com
Mon Mar 18 12:07:49 CET 2013

On 03/18/13 11:56, Michael S. Tsirkin wrote:
> On Mon, Mar 18, 2013 at 11:48:57AM +0100, Gerd Hoffmann wrote:
>> On 03/17/13 19:27, Michael S. Tsirkin wrote:
>>> With seabios built from source, and latest qemu, VMs hang during boot
>>> for me.  Bisect points at this commit:
>>> 76e58028d28e78431f9de3cee0b3c88d807fa39d
>>> Reverting this helps. Guest is stuck quite late, after
>>> 'switching root' message, so this could be just an OS
>>> visible change that it can't handle.
>>> Didn't try debugging more yet.
>> Make sure dsdt + seabios are in sync.  latest bios.bin + dsdt from qemu
>> tree isn't going to work.
>> With qemu/master (4524051c32190c1dc13ec2ccd122fd120dbed736+) you can
>> simply use 'qemu -L /path/to/seabios/out' and qemu will pick up both
>> bios.bin and dsdt tables from the seabios build output dir (and
>> everything it doesn't find there such as vgabios blobs from the default
>> paths).
>> cheers,
>>   Gerd
> Will try. What's the source of the incompatibility?

The values for the pci i/o windows are passed in a different way now.
It used to be a reference to seabios-allocated memory (BDAT) with the
location of that memory being added to the ssdt.  Now that indirection
is gone and seabios generates ssdt fields directly.  The later makes it
easier to generate the ssdt tables in qemu instead.


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