U-Boot for ODROID-C2 (S905)

ODROID-C2 is a single board computer manufactured by Hardkernel with the following specifications:

Amlogic S905 ARM Cortex-A53 quad-core SoC @ 1.5GHz

ARM Mali 450 GPU

2GB DDR3 SDRAM

Gigabit Ethernet

HDMI 2.0 4K/60Hz display

40-pin GPIO header

4 x USB 2.0 Host, 1 x USB OTG

eMMC, microSD

Infrared receiver

Schematics are available on the manufacturer website: https://wiki.odroid.com

U-Boot Compilation

$ export CROSS_COMPILE=aarch64-none-elf-
$ make odroid-c2_defconfig
$ make

U-Boot Signing with Pre-Built FIP repo

$ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
$ cd amlogic-boot-fip
$ mkdir my-output-dir
$ ./build-fip.sh odroid-c2 /path/to/u-boot/u-boot.bin my-output-dir

U-Boot Manual Signing

Amlogic does not provide sources for the firmware and tools needed to create a bootloader image so it is necessary to obtain binaries from sources published by the board vendor:

$ DIR=odroid-c2
$ git clone --depth 1 https://github.com/hardkernel/u-boot.git -b odroidc2-v2015.01 $DIR

$ $DIR/fip/fip_create --bl30  $DIR/fip/gxb/bl30.bin \
                      --bl301 $DIR/fip/gxb/bl301.bin \
                      --bl31  $DIR/fip/gxb/bl31.bin \
                      --bl33  u-boot.bin \
                      $DIR/fip.bin

$ $DIR/fip/fip_create --dump $DIR/fip.bin
$ cat $DIR/fip/gxb/bl2.package $DIR/fip.bin > $DIR/boot_new.bin
$ $DIR/fip/gxb/aml_encrypt_gxb --bootsig \
                               --input $DIR/boot_new.bin \
                               --output $DIR/u-boot.img
$ dd if=$DIR/u-boot.img of=$DIR/u-boot.gxbb bs=512 skip=96

Then write U-Boot to SD or eMMC with:

$ DEV=/dev/your_boot_device
$ BL1=$DIR/sd_fuse/bl1.bin.hardkernel
$ dd if=$BL1 of=$DEV conv=fsync bs=1 count=442
$ dd if=$BL1 of=$DEV conv=fsync bs=512 skip=1 seek=1
$ dd if=$DIR/u-boot.gxbb of=$DEV conv=fsync bs=512 seek=97