tree 5b974c9e015021aa8da82eb572e653830977d689
parent b314ebe91318acb7d366876955729ec73f44b7b5
author Stephen Warren <swarren@nvidia.com> 1348810449 +0000
committer Tom Rini <trini@ti.com> 1348848935 -0700

disk: allow - or empty string to fall back to $bootdevice

Commit 10a37fd "disk: get_device_and_partition() "auto" partition"
prevented the use of "-" on the command-line to request fallback to the
$bootdevice environment variable instead. This patch allows that, or an
empty string "" to be used.

Tested:
setenv bootfile /boot/zImage
setenv bootdevice 0:1
ext2load mmc 0:1
ext2load mmc -
ext2load mmc ""

Signed-off-by: Stephen Warren <swarren@nvidia.com>