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 

$exportCROSS_COMPILE=aarch64-none-elf-
$makejethub_j80_defconfig
$make

U-Boot Signing with Pre-Built FIP repo 

$gitclonehttps://github.com/LibreELEC/amlogic-boot-fip--depth=1
$cdamlogic-boot-fip
$mkdirmy-output-dir
$./build-fip.shjethub-j80/path/to/u-boot/u-boot.binmy-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:

$gitclonehttps://github.com/jethome-ru/jethub-aml-toolsjethub-u-boot
$cdjethub-u-boot
$exportFIPDIR=$PWD

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

$mkdirfip
$cp$FIPDIR/j80/bl2.binfip/
$cp$FIPDIR/j80/acs.binfip/
$cp$FIPDIR/j80/bl21.binfip/
$cp$FIPDIR/j80/bl30.binfip/
$cp$FIPDIR/j80/bl301.binfip/
$cp$FIPDIR/j80/bl31.imgfip/
$cpu-boot.binfip/bl33.bin
$$FIPDIR/blx_fix.sh\
fip/bl30.bin\
fip/zero_tmp\
fip/bl30_zero.bin\
fip/bl301.bin\
fip/bl301_zero.bin\
fip/bl30_new.bin\
bl30
$python$FIPDIR/acs_tool.pycfip/bl2.binfip/bl2_acs.binfip/acs.bin0
$$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
$$FIPDIR/j80/aml_encrypt_gxl--bl3enc--inputfip/bl30_new.bin
$$FIPDIR/j80/aml_encrypt_gxl--bl3enc--inputfip/bl31.img
$$FIPDIR/j80/aml_encrypt_gxl--bl3enc--inputfip/bl33.bin--compresslz4
$$FIPDIR/j80/aml_encrypt_gxl--bl2sig--inputfip/bl2_new.bin--outputfip/bl2.n.bin.sig
$$FIPDIR/j80/aml_encrypt_gxl--bootmk\
--outputfip/u-boot.bin\
--bl2fip/bl2.n.bin.sig\
--bl30fip/bl30_new.bin.enc\
--bl31fip/bl31.img.enc\
--bl33fip/bl33.bin.enc

Then write U-Boot to SD or eMMC with:

$DEV=/dev/boot_device
$ddif=fip/u-boot.bin.sd.binof=$DEVconv=fsync,notruncbs=512skip=1seek=1
$ddif=fip/u-boot.bin.sd.binof=$DEVconv=fsync,notruncbs=1count=440