U-Boot for JetHub J100¶

JetHome Jethub D1 (http://jethome.ru/jethub-d1) is a series of home automation controller manufactured by JetHome with the following specifications:

Amlogic A113X (ARM Cortex-A53) quad-core up to 1.5GHz

no video out

512MB/1GB DDR3 or 2GB DDR4 SDRAM

8/16/32GB eMMC flash

1 x USB 2.0

1 x 10/100Mbps ethernet

WiFi / Bluetooth one from: - AMPAK AP6255 (Broadcom BCM43455) IEEE 802.11a/b/g/n/ac, Bluetooth 4.2 - RTL8822CS IEEE 802.11a/b/g/n/ac, Bluetooth 5.0 - Amlogic W155S1 WiFi5 IEEE 802.11a/b/g/n/ac, Bluetooth 5.2

2 x gpio LEDS

GPIO user Button

DC source with a voltage of 9 to 56 V / Passive POE

DIN Rail Mounting case

Basic version also has:

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

1 x 1-Wire

2 x RS-485

4 x dry contact digital GPIO inputs

3 x relay GPIO outputs

U-Boot compilation¶

$ export CROSS_COMPILE=aarch64-none-elf-
$ make jethub_j100_defconfig
$ make

Image creation¶

For simplified usage, pleaser refer to Pre-Generated FIP file set with codename jethub-j100

Amlogic doesn’t provide sources for the firmware and for tools needed to create the bootloader image, so it is necessary to obtain binaries from the git tree 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 mainline U-boot source tree then :

$ mkdir fip

$ cp $FIPDIR/j100/bl2.bin fip/
$ cp $FIPDIR/j100/acs.bin fip/
$ cp $FIPDIR/j100/bl21.bin fip/
$ cp $FIPDIR/j100/bl30.bin fip/
$ cp $FIPDIR/j100/bl301.bin fip/
$ cp $FIPDIR/j100/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

$ $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/j100/aml_encrypt_axg --bl3sig --input fip/bl30_new.bin \
                                    --output fip/bl30_new.bin.enc \
                                    --level v3 --type bl30
$ $FIPDIR/j100/aml_encrypt_axg --bl3sig --input fip/bl31.img \
                                    --output fip/bl31.img.enc \
                                    --level v3 --type bl31
$ $FIPDIR/j100/aml_encrypt_axg --bl3sig --input fip/bl33.bin --compress lz4 \
                                    --output fip/bl33.bin.enc \
                                    --level v3 --type bl33
$ $FIPDIR/j100/aml_encrypt_axg --bl2sig --input fip/bl2_new.bin \
                                    --output fip/bl2.n.bin.sig
$ $FIPDIR/j100/aml_encrypt_axg --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 --level v3

and then write the image to eMMC with:

$ DEV=/dev/your_emmc_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=444