$ sudo fdisk /dev/sdX
Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 2048 26623 24576 12M c W95 FAT32 (LBA)
$ sudo mkfs.vfat /dev/sdX1
$ wget https://github.com/steward-fu/website/releases/download/beagleboard-xm/MLO
$ wget https://github.com/steward-fu/website/releases/download/beagleboard-xm/u-boot.img
$ sudo mount /dev/sdX1 /mnt
$ cp MLO u-boot.img /mnt
$ sudo umount /mnt