cmd: mvebu/bubt: a38x: Do not hardcode SATA block size to 512

Find SATA block device by blk_get_devnum_by_uclass_id() function and read
from it the real block size of the SATA disk. In case of error, fallback
back to 512 bytes.

Signed-off-by: Pali Rohár <pali@kernel.org>
1 file changed