[SeaBIOS] [HELP] The program cause screen mess
lyjforjob at gmail.com
Fri Apr 24 01:49:24 CEST 2015
2015-04-24 5:42 GMT+08:00 Kevin O'Connor <kevin at koconnor.net>:
> On Wed, Apr 22, 2015 at 02:20:51PM +0800, eJim Lee wrote:
>> Hi kevin:
>> If you want to repeat the bug, you can try:
>> 1. Go to "Control panel->Regional and Language
>> Options->Advanced->Language for non-Unicode programs" and select
>> "Chinese (PRC)".
>> 2. reboot
>> 3. run wbc
>> I also tried the program on vmware and looked nice. But something
>> different with qemu about cursor:
>> On qemu with WinXP English: cursor is on screen but not on vmware.
>> Hope these information can help you.
>> eJim Lee
>> 2015-04-21 23:41 GMT+08:00 eJim Lee <lyjforjob at gmail.com>:
>> > I have tried it without kvm and bug repeated:
>> > ./build/x86_64-softmmu/qemu-system-x86_64 -chardev stdio,id=seabios
>> > -device isa-debugcon,iobase=0x402,chardev=seabios -m 512 -hda
>> > tmp/xp.append -hdb tmp/data.append
> This issue doesn't seem like a vgabios issue. It doesn't appear that
> the program calls the vgabios and the program seems to function
> correctly when changing non-vgabios settings. So, it appears that
> something unknown is the root cause of the intermittent screen
I believe that the program didn't call the vgabios, but I can't
understand why the program work better when I changed vgabios code.
And I believe the issue isn't related to qemu vga device because the
vmware_vgabios also used it and the program worked perfectly.
I found screen mess is related to cursor, because cursor appeared when
the program work on qemu and non-unicode was English but not when on
When I changed the cheight from 16 to 8 in mode 0x12 and deleted the
code calling gfx_write_char, the program is close to work perfact.
So I think the issue may be related to cursor and cheight. I think the
program draw a cursor because XP get something from vgabios and
provide to it.
Kevin, could you tell me something about XP cursor or vgabios
interface leaded to operator drawing cursor or not?
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