[coreboot] Build coreboot with grub/grub2 payload

[崔磊]

Hello, all
I found that grub could be used as a coreboot payload at coreboot
website, but no more detail messages.
Can anyone give me some advices?
I alse found there were great resource at http://grub.enbug.org, but I
can not open it, the other people around me
can not open it either, maybe, its address had changed. Can anyone open it?

BRs,

C.L.