I run F20 root FS with F21 3.12.1-2.fc21.armv7hl kernel. (see http://www.swissdutch.ch:4999/ ) on my Wandboard quad.

I cannot boot from sata, as the root FS is being mounted about 4 seconds before the sata device is ready during the fedora boot process.
(And yes, I understand uSD card is needed for uboot, kernel, mouting /boot fs etc. That is perfectly acceptable - I just want the root FS and swap to be coming from Sata for obvious reasons).

I try to understand the magics of Fedora boot, initramfs and the likes. It seems I need to get a PhD for this!  ;-)

Question: how do I ensure the root fs is mounted AFTER the sata device is ready???
Some people suggested adding a sleep command ro a dependency - my question is where and how in the initramfs do I do such a thing???

(again, when booting pointing the root fs to the sd card, the sata is working fine at the first login as seen with fdisk -l).

Cheers, Ronald