I've send a patch to u-boot upstream that enable sata on wandboard quad.
This patch operates as appropriate on the device, but it also need to
be tested on wandboard single/dual which don't have the sata port.
(because the u-boot binary is the same for all board variants).
You need to apply the patch to the current u-boot upstream tree (or to
the u-boot fedora spec) and report the serial output
Thx for sending the feedback to the u-boot ml directly. (eventually
with Sefano Babic cc'ed).