On Wed, 2014-04-16 at 12:37 -0400, Kevin O'Connor wrote: > On Mon, Apr 14, 2014 at 02:22:51PM +0200, Gerd Hoffmann wrote: > > So you can try this: > > > > qemu -vga std > -bios /usr/share/coreboot.git/coreboot-i440fx-seabios.rom > > > > to see it live in action. > > > > Two problems spotted so far: > > > > (1) ipxe hangs at rom load time. > > can be worked around by adding '-net none' to the qemu cmd > line. > > I've reproduced this. It only fails for me with -enable-kvm. It was > (as I feared) the result of segment limits getting trashed from the > int 1587 call. (Presumably, qemu tcg doesn't fail because it doesn't > implement segment limits?) The (incorrect) patch below enables the > boot to proceed past the ipxe prompt. > > This is unfortunate. I can put a hack into seabios (not seavgabios) > to use bigreal mode for int 1587 calls during option rom execution. > But, it does raise the question of how many other callers expect the > bios to not mess with the segment limits. (Though, to be honest, the > only goal I have with coreboot native seavgabios is support for grub, > lilo, syslinux, and maybe ntldr.)
Was there a conclusion to this? Did you eventually convince yourself that it could be *OK* for the video BIOS to trash the segment limits, for a limited set of boot targets? -- dwmw2
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