[openfirmware] Troubleshooting VGA under qemu? [patch]

[James Cameron]

Summary: tested, missing some change box.

I've tested your patch with qmeu-2.0.0 and it mostly works.

	qemu-system-i386  -L . -bios emuofw.rom  -hda fat:. -vga vmware

But when a burst of text occurs some of the screen is not updated.  To
reproduce, type show-devs at the ok prompt.  See attached window
capture.

Forcing an X refresh of qemu does not fix.

Forcing a screen scroll does fix.

Forcing a whole screen change in the Open Firmware driver does fix:

	ok select /display  screen-changed

Debugger with serial shows char-changed is being called by
vm-draw-character.

My guess is that this may be a problem with the qemu-2.0.0 vmware
driver, or that the burst of char-changed register writes is lost by
qemu.  Can you reproduce with later qemu?

-- 
James Cameron
http://quozl.linux.org.au/
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