qemu -M isapc displays blank screen

[Michael Tokarev]

$ 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

[Michael Tokarev (mjt+launchpad-tls)]

$ 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.

[Michael Tokarev (mjt+launchpad-tls)]

It looks like this issue is fixed in 1.6.0 version