On 12/15/09 23:51, Sebastian Herbszt wrote:
Qemu will map rom1.bin to PC_ROM_MIN_OPTION (0xc8000) and map rom2.bin
to 0xd0000.
No.
rom1.bin will be loaded to max(0xc8000, 0xc0000 + cirrus-bios-size)
aligned to 2k, which (with cirrus) is 0xc90000.
rom2.bin will be loaded after rom1.bin (also 2k aligned), so the address
will depend on rom1.bin size.
Either qemu will map vga bios to PC_ROM_MIN_VGA (0xc0000) or
SeaBIOS will map it there (with pci 3.0 it could map it somewhere else,
but i doubt thats
a good idea). In case the vga bios size is below 0x8000, some rom space
is lost.
Because it is larger than 0x8000 option roms will be overwritten when
loaded to 0xc8000
SeaBIOS
will scan the option rom space starting at PC_ROM_MIN_OPTION and adjust
its RomEnd in
case a rom is found. Then it will start the pci scan and map pci option
roms after RomEnd.
Doesn't fly.
I think either qemu or seabios should load *all* roms. I think the idea
to provide non-pci roms via fw_cfg and let seabios load them is the best
idea we had so far.
cheers,
Gerd
