[coreboot] What is the difference between fadt rev 3 and rev 1

[Bao, Zheng]

Hi,
My bimini board now can boot linux to login, with the sb800 code in
trunk. But I have to change the fadt->revision to 1. I am so confused.
Why this field can affect my linux booting. If I have to change it back
to 3, what else should I do to make it run correctly?

Attachments are the dmesg of 2 cases.

Zheng