[SeaBIOS] [RFC 2/2] Add Linux boot code for the fw_cfg dma interface

[Gerd Hoffmann]

  Hi,

> > Doing this in seabios looks appealing too as seabios needs the code
> > for fw_cfg support anyway and it is already written in C.  It needs
> > some more care through so things like bootorder and pxeboot continue
> > to work. Maybe seabios could match the rom name (the one which
> > appears in the boot menu) to figure whenever it should kick a direct
> > kernel boot.
> 
> Have you looked at the other email thread?:
> http://www.seabios.org/pipermail/seabios/2015-August/009603.html
> 
> There's some work missing, but a basic sketch of this ROM problem is
> here:
> http://www.seabios.org/pipermail/seabios/2015-August/009606.html

Yep, saw that.  pxe roms are IPL_TYPE_BEV too, so taking over this way
will break network boot.

qemu_cfg_dma_boot_linux() itself looks sane to me.  Just the way it gets
kicked needs some refining.  And in the future we probably want split
qemu_cfg_dma_boot_linux() into smaller functions for stuff like booting
the kernel from flash.

cheers,
  Gerd