[Qemu-devel] [Bug 1024248] Re: qemu -M isapc displays blank screen

[Michael Tokarev]

$ qemu-system-x86_64 -M isapc -chardev file,path=/dev/fd/1,id=seabios -device 
isa-debugcon,iobase=0x402,chardev=seabios 
Start bios (version 1.7.0-20120603_194846-gandalf)
Unable to unlock ram - bridge not found
Ram Size=0x00000000 (0x0000000000000000 high)
WARNING - Unable to allocate resource at addSpace:118!
WARNING - Unable to allocate resource at addSpace:118!
WARNING - Unable to allocate resource at addSpace:118!
No space for init relocation.

$ qemu-system-x86_64 -M isapc -enable-kvm -chardev 
file,path=/dev/fd/1,id=seabios -device 
isa-debugcon,iobase=0x402,chardev=seabios 
Start bios (version 1.7.0-20120603_194846-gandalf)
Unable to unlock ram - bridge not found
Ram Size=0x08000000 (0x0000000000000000 high)
Relocating init from 0x000e4540 to 0x07fe1d80 (size 57684)
=== PCI bus & bridge init ===
Detected non-PCI system
No apic - only the main cpu is present.
MP table addr=0x000fdb00 MPC table addr=0x000fdb10 size=216
SMBIOS ptr=0x000fdae0 table=0x000fd9d0 size=263
Scan for VGA option rom
Running option rom at c000:0003
Turning on vga text mode console
SeaBIOS (version 1.7.0-20120603_194846-gandalf)

So without kvm, the RAM size is detected as being 0.

FWIW.

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https://bugs.launchpad.net/bugs/1024248

Title:
  qemu -M isapc displays blank screen

Status in QEMU:
  Confirmed
Status in “qemu” package in Debian:
  Confirmed

Bug description:
  $ qemu-system-x86_64 -M isapc

  This displays blank SDL window.  It has been this way since forever I
  guess, at least according to http://bugs.debian.org/605525 (a Debian
  bugreport about it).  However, this:

  $ qemu-system-x86_64 -M isapc -enable-kvm

  works (at least in current 1.1), and it works fine in qemu-kvm.  On
  the other hand, this:

  $ qemu-kvm -M isapc -no-kvm

  also shows blank window.  Something is wrong with isapc & TCG, and has
  been for a long time...

  Thanks,

  /mjt

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