U-Boot for ODROID-C2¶

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

Amlogic S905 ARM Cortex-A53 quad-core SoC @ 2GHz

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.

U-Boot compilation¶

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

Image creation¶

Amlogic doesn’t provide sources for the firmware and for tools needed to create the bootloader image, so it is necessary to obtain them from the git tree 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

and then write the image to SD with:

$ DEV=/dev/your_sd_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