[coreboot] Kernel payload and injecting initramfs

[Peter Stuge]

Segher pointed out on IRC that these days it {sh,c}ould be possible
for EtherBoot and coreboot to load a vmlinux ELF directly.

There was some discussion about initrd/initramfs and Martin-Eric
expressed the need to combine kernel+initramfs after the kernel
was built.

I first thought that would be pretty difficult, but as it turns out
it may not be so bad.

I've created http://www.coreboot.org/Initramfs which shows the two
steps that are neccessary, in theory. Please test and verify if this
works with the popular ELF loaders we know and send us a note.

Thanks!

//Peter