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