[Qemu-devel] [Bug 1361618] Re: sparc cg3 1152x900 display abnormal

[Mark Cave-Ayland]

Due to the OpenBIOS ROM being larger than OBP, it is currently unable to
allocate enough memory for the larger 1152x900 framebuffer (and sadly
it's not a simple fix to shrink down the memory requirements).

Fortunately if you are using the real Sun ROM ss5.bin then you can just
use a real Sun cgthree ROM in order to get a 1152x900 framebuffer in
QEMU. Currently you can find a copy at
http://people.csail.mit.edu/fredette/tme/sun-u1-nbsd.html if you don't
have one handy.

Simply rename the existing OpenBIOS QEMU,cgthree.bin ROM to
QEMU,cgthree.bin.old, download the real Sun cgthree ROM and rename it to
QEMU,cgthree.bin in place of the old file. Now you should find you can
start QEMU with -g 1152x900 and the larger display size will work fine.

I would say that this isn't necessarily a bug as it's more a restriction
in the way OpenBIOS works, however I agree that the documentation is
probably not particularly clear in this respect. One final note: the Sun
cgthree ROM is fixed at 1152x900 resolution, so if you need to switch
back to 1024x768 (or want to auto boot without manual intervention) then
you'll need to temporarily rename the ROM files so the original OpenBIOS
QEMU,cgthree.bin file is used once again.


Kind regards,

Mark.

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https://bugs.launchpad.net/bugs/1361618

Title:
  sparc cg3 1152x900 display abnormal

Status in QEMU:
  New

Bug description:
  when I use -vga cg3 -g 1152x900 with qemu-system-sparc, the display is 
abnormal
  I had try qemu-2.1.0 on win2003 with openBIOS or OBP
      qemu-system-sparc.exe -vga cg3 -g 1152x900
  or
      qemu-system-sparc.exe -vga cg3 -g 1152x900 -bios ss5.bin

  I also try qemu-2.0.2 on debian 6.0.1a i686 on VirtualBox host win2003
  with same command, in vnc view, the display is same as on win2003.

  If I don't use -g 1152x900 parameter, everything is OK, sunOS 4.1.4
  work well.

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