linux-mainline 3.8: enable more ramdisk options

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
linux-mainline 3.8: don't write to read-only mcasp registers

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
linux-mainline 3.8: misc updates

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Merge pull request #2 from koenkooi/master

Merge updates from parent fork