Patch merged into coreboot/master: src/southbridge/amd/sb700: Reset SATA controller in AHCI mode during startup

the following patch was just integrated into master:
commit 14ebf951e41c085aa2f8420fcf7452dc5761514e
Author: Timothy Pearson 
Date:   Sun Jun 21 16:27:03 2015 -0500

src/southbridge/amd/sb700: Reset SATA controller in AHCI mode during startup

In AHCI mode SeaBIOS randomly fails to detect disks (AHCI timeouts),
    with the probability of a failure increasing with the number of disks
    connected to the controller.  Resetting the SATA controller appears to
    show the true state of the underlying hardware, allowing the drive
    detection code to attempt link renegotiation as needed.

Change-Id: Ib1f7c5f830a0cdba41cb6f5b05d759adee5ce369
    Signed-off-by: Timothy Pearson 
    Reviewed-on: http://review.coreboot.org/11998
    Tested-by: Raptor Engineering Automated Test Stand 
    Reviewed-by: Stefan Reinauer 
    Tested-by: build bot (Jenkins)

See http://review.coreboot.org/11998 for details.

-gerrit