RE: [Xen-devel] xen,bproc and grub

[Adam Sulmicki <adam@xxxxxxxxxxxx>]

> > > > > We wrote a patch to add multiboot support to kexec (that's how
> > > > > Xenoboot works).  It was submitted to the kexec
> > maintainer, but I
> > > > > don't know whether it was accepted or not.
> > > > http://www.tjd.phlegethon.org/software/kexec-multiboot.patch
> >
> > argh, it seems to be using real-mode for booting, and it
> > seems multiboot specs seems to assume existence of pcbios.
> >
> > i guess the right way will be just to strop xen.gz of all 16
> > bit code and have it loaded and started in 32 bit mode. In
> > that way kexec could treat xen like elf32-x86 type file.
>
> I forget the context of what you're trying to do.
>
> With Tim's multiboot patch, kexec is able to 'boot' into xen just fine.
>
> I think Tim has recently been looking at how we could roll a xen and
> dom0 image into a static multiboot file that is then wrapped to appear
> like a standard linux bzImage.

yeah, kexec+multiboot works just fine for me on the laptop with PCBIOS.

However, when I try kexec+multiboot on a node running LinuxBIOS the end
result is something that looks as if node has rebooted. Pooking around I
traced it down to the fact that it uses real mode. (If I try to load linux
kernel using real-mode and kexec I get the exactly the same reboot, if on
the other hand I try to load the same kernel using 32 bit mode it seems to
work fine).

Either way I'm leaving for SuperComputing tomorrow so it probably will be
few days before I get chance to look more as to what exactly is going
wrong.




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