There is a section describing exactly how the boot ROM supposedly finds and reads the FAT filesystem and the MLO file in the OMAP3 TRM (section 25.4.7.6.4 File System Handling).
There is a section describing exactly how the boot ROM supposedly finds and reads the FAT filesystem and the MLO file in the OMAP3 TRM (section 25.4.7.6.4 File System Handling).