Re: [Qemu-devel] [PATCH v4 6/7] Make the kernel image in the fw_cfg DMA interface bootable

[Kevin O'Connor]

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?  If so,
seabios can just fall back to using multiboot.bin.

-Kevin