ODROID-C5: amlogic/mmc: check Amlogic bootloader signature

Amlogic U-Boot overwrites the second LBA with the secondary GPT partition when
MMC is initiated, since it always thinks that the GPT partition table is being
used. An OS with non-GPT partition and U-Boot is placed at the second partition
will have a boot problem since the U-Boot will be removed when it's flashed to
the memory card that has a GPT partition with a prior OS.

Signed-off-by: Dongjin Kim <tobetter@gmail.com>
Change-Id: Idf17a2c791c791371b0e8df3757969677444e8e9
1 file changed