[SeaBIOS] Seabios blocked at running option rom at c000:0003

[Kevin O'Connor]

On Sun, Oct 14, 2018 at 03:32:22PM +0800, Acewind wrote:
> Dear All,
> These days I'm working on Intel IGD passthrough by qemu+vfio.
> Success on i3-6100, but failed on i3-6100U.
[...]
> Found 2 cpu(s) max supported 2 cpu(s)
> Copying PIR from 0x7ffbfca0 to 0x000f1c40
> Copying MPTABLE from 0x00006e90/7ffa8e80 to 0x000f1b10
> Copying SMBIOS entry point from 0x00006e90 to 0x000f1930
> Scan for VGA option rom
> Running option rom at c000:0003
> 
> Now seabios stops and monitor shows no signal.
> I have install win10 directly on the host and it works well. Does it means
> the vga rom image is ok? What can I do for further debug? Thanks!

The "Running option rom at c000:0003" indicates a video card option
rom was found and SeaBIOS started executing it.  The likely reason for
the failure is that the video option rom itself crashed.  It's
difficult to debug these types of failures because it is rare to have
access to the video rom code.

-Kevin