[coreboot] Linux kernel hangs

[Iru Cai]

Hi,

I'm testing the Lenovo T420 port[1]. After I saw some commits on
Sandy/Ivy RAM init and native graphics init code, I asked Nicolas
Reinecke to rebase and update the code. After I flashed the new
firmware, coreboot runs fine and boot to GRUB payload. However, Linux
kernel hanged and could not boot. I think there must be something
wrong with some of the upstream commits.

[1] http://review.coreboot.org/#/c/11765/

Iru Cai