On Fr, 2015-10-02 at 09:38 -0400, Kevin O'Connor wrote:
> On Fri, Oct 02, 2015 at 10:16:26AM +0200, Gerd Hoffmann wrote:
> > Hi,
> >
> > > That's fine with me. Marc - I think qemu_vmlinux_setup() in SeaBIOS
> > > with the following would work:
> > >
> > > void qemu_vmlinux_setup(void)
> > > {
> > > u32 kernel_size;
> > > qemu_cfg_read_entry(&kernel_size, QEMU_CFG_KERNEL_SIZE,
> > > sizeof(kernel_size));
> > > if (kernel_size)
> > > boot_add_qemu_vmlinux("QEMU Kernel image", 0);
> > > }
> >
> > It isn't that simple. We also have support for multiboot kernels (using
> > multiboot.bin option rom). So when doing this you need to be prepared
> > to find a multiboot kernel in fw_cfg.
>
> Is there some way to detect if it's a multiboot kernel?
Yes. There is a header with magic + checksum in the first 8k, see
hw/i386/multiboot.c (in qemu).
Or check the option rom name in the bootorder file, it's multiboot
instead of linuxboot.
> If so,
> seabios can just fall back to using multiboot.bin.
Or add multiboot support to seabios.
cheers,
Gerd
