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diff --git a/board/odroid-xu4/readme.txt b/board/odroid-xu4/readme.txt new file mode 100644 index 000000000..be8113bdc --- /dev/null +++ b/board/odroid-xu4/readme.txt @@ -0,0 +1,165 @@ +Odroid XU-4 board with Samsung Exynos 5422 SoC + +Introduction +------------ + +The Odroid XU 4 board is developed and shipped by Hrdkernel (hardkernel.com). It +uses the Samsung Exynos 5422 Soc. + +Odroid boot process +------------------- + +The odroid boot process requires three stages of boot plus trust zone: + + boot level 1 + + | + V + + boot level 2 + + | + V + + u-boot + +and they need to be raw copied to the SD card in the following order: + + +----------------+----------------+ + | boot level 1 | 1 block | + +----------------+----------------+ + | boot level 2 | 31 block | + +----------------+----------------+ + | u-boot | 63 block | + +----------------+----------------+ + | trust zone | 2111 block | + +----------------+----------------+ + | boot partition | 4096 block | + +----------------+----------------+ + | rootfs | | + +----------------+----------------+ + +How to build buildroot +---------------------- + +Forst of all configure the buildroot environment: + + $ make odroid-xu4_defconfig + +If needed personalize the build + + $ make menuconfig + +then hit + + $ make + +At the end of the build you should get in the output/images directory the +following files: + + - bl1.bin.hardkernel + Level 1 boot loader + + - bl2.bin.hardkernel.1mb_uboot + Level 2 boot loader + + - exynos5422-odroidxu4.dtb + Linux Kernel Device Tree blop + + - rootfs.tar + Compressed root file system image + + - tzsw.bin.hardkernel + ARM Truzt Zone + + - u-boot.bin + u-boot image + + - zImage + Linux Kernel Image + +Set up the bootloader +--------------------- + +I will assume you will use an sd card which will have as mount point /dev/sdb. +The above images need to be flashed to the SD card to specific addresses, as +follows: + + # dd if=bl1.bin.hardkernel of=/dev/sdb seek=1 bs=512 + # dd if=bl2.bin.hardkernel.1mb_uboot of=/dev/sdb seek=31 bs=512 + # dd if=u-boot.bin of=/dev/sdb seek=63 bs=512 + # dd if=tzsw.bin.hardkernel of=/dev/sdb seek=2111 bs=512 + +With the above we should be able to boot up to the u-boot bootloader. + +Set up the SD card +------------------ + +The SD card will need to partitions, which you can make with your favourite +partitioner. At the end it should look like this: + +Device Boot Start End Sectors Size Id Type +/dev/sdb1 4096 135167 131072 64M b W95 FAT32 +/dev/sdb2 135168 15523839 15388672 7.3G 83 Linux + +IMPORTANT: Please note that the first partition starts at the block 4096 instead +of the default 2048. This is due to the sizes of the binaries we flased earlier, +which go over the 2048 block, therefore, you need to start the first partition +at a further location, e.g. 4096. + +Now format the two partitions, the first as vfat FS type, the second as EXT3 or +EXT4: + + # mkfs.vfat /dev/sdb1 + # mkfs.ext4 /dev/sdb2 + +Finalize the SD card +-------------------- + +Now it's time to move Kernel and File System to the SD card. We will start from +the Kernel partition. + +First mount it: + + # mount /dev/sdb1/ /mnt/ + +and copy kernel and dtb + + # cp <buildroot>/output/images/zImage /mnt/ + # cp <buildroot>/output/images/exynos5422-odroidxu4.dtb /mnt/ + +umount the partition + + # sync + # umount /dev/sdb1 + +Mount the rootfs partition: + + # mount /dev/sdb2 /mnt/ + # tar + # cp <buildroot>/output/images/rootfs.tar -C /mnt/ + +Umount the partition + + # sync + # umount /dev/sdb2 + +The SD card is ready, you can boot now your Odroid XU-4. + +Automate u-boot commands +------------------------ + +In order to avoid customizing u-boot from the u-boot system at boot time, you +can use the boot.cmd file in board/odroid-xu4. + +Jut run + + $ mkimage -A arm -T script -C none -d boot.cmd boot.scr + +the output is an u-boot readable binary which needs to be copied in the first +partition of the SD card: + + # mount /dev/sdb1 /mnt/ + # cp boot.scr /mnt/sdb1 + # sync + # umount /dev/sdb1 |