U-Boot for JetHub J80 (S905W)

JetHome Jethub H1 (http://jethome.ru/jethub-h1) is a home automation controller device manufactured by JetHome with the following specifications:

  • Amlogic S905W (ARM Cortex-A53) quad-core up to 1.5GHz

  • No video out

  • 1GB DDR3

  • 8/16GB eMMC flash

  • 2 x USB 2.0

  • 1 x 10/100Mbps ethernet

  • SDIO WiFi / Bluetooth RTL8822CS IEEE 802.11a/b/g/n/ac, Bluetooth 5.0.

  • TI CC2538 + CC2592 Zigbee Wireless Module with up to 20dBm output power and Zigbee 3.0 support.

  • MicroSD 2.x/3.x/4.x DS/HS cards.

  • 1 x gpio LED

  • ADC user Button

  • DC source 5V microUSB

  • Square plastic case

U-Boot Compilation

$ export CROSS_COMPILE=aarch64-none-elf-
$ make jethub_j80_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 jethub-j80 /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:

$ git clone https://github.com/jethome-ru/jethub-aml-tools jethub-u-boot
$ cd jethub-u-boot
$ export FIPDIR=$PWD

Go back to the mainline U-Boot source tree then:

$ mkdir fip

$ cp $FIPDIR/j80/bl2.bin fip/
$ cp $FIPDIR/j80/acs.bin fip/
$ cp $FIPDIR/j80/bl21.bin fip/
$ cp $FIPDIR/j80/bl30.bin fip/
$ cp $FIPDIR/j80/bl301.bin fip/
$ cp $FIPDIR/j80/bl31.img fip/
$ cp u-boot.bin fip/bl33.bin

$ $FIPDIR/blx_fix.sh \
    fip/bl30.bin \
    fip/zero_tmp \
    fip/bl30_zero.bin \
    fip/bl301.bin \
    fip/bl301_zero.bin \
    fip/bl30_new.bin \
    bl30

$ python $FIPDIR/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0

$ $FIPDIR/blx_fix.sh \
    fip/bl2_acs.bin \
    fip/zero_tmp \
    fip/bl2_zero.bin \
    fip/bl21.bin \
    fip/bl21_zero.bin \
    fip/bl2_new.bin \
    bl2

$ $FIPDIR/j80/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
$ $FIPDIR/j80/aml_encrypt_gxl --bl3enc --input fip/bl31.img
$ $FIPDIR/j80/aml_encrypt_gxl --bl3enc --input fip/bl33.bin --compress lz4
$ $FIPDIR/j80/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
$ $FIPDIR/j80/aml_encrypt_gxl --bootmk \
                              --output fip/u-boot.bin \
                              --bl2 fip/bl2.n.bin.sig \
                              --bl30 fip/bl30_new.bin.enc \
                              --bl31 fip/bl31.img.enc \
                              --bl33 fip/bl33.bin.enc

Then write U-Boot to SD or eMMC with:

$ DEV=/dev/boot_device
$ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
$ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=440