掌機 - Pyra - 如何製作可開機SD

參考資訊：
https://dev.pyra-handheld.com/daveshah/pyra-uboot/-/tree/pyra-alt-ddr3
https://forum.digikey.com/t/debian-getting-started-with-the-omap5432-uevm/12455

步驟如下：

$ sudo dd if=/dev/zero of=/dev/sdb bs=1M count=10
$ sudo dd if=MLO of=/dev/sdb count=2 seek=1 bs=128k
$ sudo dd if=u-boot.img of=/dev/sdb count=4 seek=1 bs=384k
$ sudo fdisk /dev/sdb
    Command (m for help): p
    Disk /dev/sdb: 3.7 GiB, 3904897024 bytes, 7626752 sectors
    Disk model: Storage Device
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disklabel type: dos
    Disk identifier: 0x5b9d58b7

    Device     Boot   Start     End Sectors  Size Id Type
    /dev/sdb1         16384 1064959 1048576  512M  c W95 FAT32 (LBA)
    /dev/sdb2       1064960 7626751 6561792  3.1G 83 Linux

$ sudo mkfs.vfat /dev/sdb1
$ sudo mkfs.ext4 /dev/sdb2
$ sudo fatlabel /dev/sdb1 boot
$ sudo e2label /dev/sdb2 rootfs

/dev/sdb是司徒使用的例子，最前面保留8MB給MLO、u-boot.img使用