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Date: Sun, 11 May 2014 13:42:57 +0200
From: Bernhard Walle <bernhard@bwalle.de>
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Subject: Re: [Qemu-devel] uvesafb doesn't work with seabios
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To: Kevin O'Connor <kevin@koconnor.net>
Cc: qemu-devel@nongnu.org, kraxel@redhat.com

Am 10.05.14 17:07, schrieb Kevin O'Connor:
> 
> Can you run the original SeaVGABIOS image and provide the output with
> the following added to the qemu command line:
> 
> -chardev stdio,id=seabios -device isa-debugcon,iobase=0x402,chardev=seabios

Since it's quite much debugging info, I uploaded it to
http://bwalle.de/tmp/debugoutput-unmodified

Basically it's

  set VGA mode 12
  set VGA mode 3
  VBE mode info request: 100
  VBE mode info request: 101
  ...
  VBE mode info request: 6a
  set VGA mode 3
  VBE mode info request: 100

> Also, it looks like uvesafb can call x86emu.  Older versions of x86emu
> are known to not emulate some instructions properly, and it has caused
> problems for SeaVGABIOS.  The most recent version of SeaVGABIOS from
> SeaBIOS git has additional checks for this - can you grab the seabios
> git, set CONFIG_DEBUG_LEVEL to 8, build SeaVGABIOS (set
> CONFIG_VGA_BOCHS), and post the logs from both Linux and QEMU with the
> above options?

It doesn't change the result (that it doesn't work). It only makes the
kernel failing much faster and of course there's much more debugging
output: http://bwalle.de/tmp/debugoutput (250k).


Regards,
Bernhard