SignGP tool, just attached a header to x-loader.bin for OMAP3/4 MMC/SD booting
Currently, I know have two verision header
1. original version , just added image length and a default start address(0x40200800) of memory
2. 2nd version, attached a configuration header for SDRAM setting in original version
will generation a x-loader.bin.ift file, rename it to MLO and copy into SD/MMC card.