[U-Boot] MBR emulation

[Steven Barker]

I have a Tegra 2 device that stores its configuration data in the spot that
the MBR is meant to sit on the device this is immobile and cannot be moved,
The device has a GPT partition table but no MBR, is there a way to either
make u-boot just read the GPT from the end of the emmc or, emulate the mbr
either statically or by loading an "MBR.bin" from elsewhere on the emmc
device. At the moment u-boot does see the emmc but cannot read the partition
table