U-Boot for Amlogic W400 (S922X)

W400 is a reference board manufactured by Amlogic with the following specification:

  • Amlogic S922X ARM Cortex-A53 dual-core + Cortex-A73 quad-core SoC

  • 2GB DDR4 SDRAM

  • 10/100 Ethernet (Internal PHY)

  • 1x USB 3.0 Host

  • eMMC

  • SDcard

  • Infrared receiver

  • SDIO WiFi Module

  • MIPI DSI Connector

  • Audio HAT Connector

  • PCI-E M.2 Connector

Schematics are available from Amlogic on demand.

U-Boot Compilation

$ export CROSS_COMPILE=aarch64-none-elf-
$ make w400_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-j100 /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:

$ wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
$ wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
$ tar xvfJ gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
$ tar xvfJ gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
$ export PATH=$PWD/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux/bin:$PWD/gcc-linaro-arm-none-eabi-4.8-2013.11_linux/bin:$PATH
$ git clone https://github.com/BayLibre/u-boot.git -b buildroot-openlinux-20180418 amlogic-u-boot
$ cd amlogic-u-boot
$ make g12b_w400_v1_defconfig
$ make
$ export UBOOTDIR=$PWD

Download the latest Amlogic buildroot package and extract it:

$ wget http://openlinux2.amlogic.com:8000/ARM/filesystem/Linux_BSP/buildroot_openlinux_kernel_4.9_fbdev_20180706.tar.gz
$ tar xfz buildroot_openlinux_kernel_4.9_fbdev_20180706.tar.gz buildroot_openlinux_kernel_4.9_fbdev_20180706/bootloader
$ export BRDIR=$PWD/buildroot_openlinux_kernel_4.9_fbdev_20180706
$ export FIPDIR=$BRDIR/bootloader/uboot-repo/fip

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

$ mkdir fip

$ wget https://github.com/BayLibre/u-boot/releases/download/v2017.11-libretech-cc/blx_fix_g12a.sh -O fip/blx_fix.sh
$ cp $UBOOTDIR/build/scp_task/bl301.bin fip/
$ cp $UBOOTDIR/build/board/amlogic/g12b_w400_v1/firmware/acs.bin fip/
$ cp $BRDIR/bootloader/uboot-repo/bl2/bin/g12b/bl2.bin fip/
$ cp $BRDIR/bootloader/uboot-repo/bl30/bin/g12b/bl30.bin fip/
$ cp $BRDIR/bootloader/uboot-repo/bl31_1.3/bin/g12b/bl31.img fip/
$ cp $FIPDIR/g12b/ddr3_1d.fw fip/
$ cp $FIPDIR/g12b/ddr4_1d.fw fip/
$ cp $FIPDIR/g12b/ddr4_2d.fw fip/
$ cp $FIPDIR/g12b/diag_lpddr4.fw fip/
$ cp $FIPDIR/g12b/lpddr4_1d.fw fip/
$ cp $FIPDIR/g12b/lpddr4_2d.fw fip/
$ cp $FIPDIR/g12b/piei.fw fip/
$ cp $FIPDIR/g12b/aml_ddr.fw fip/
$ cp u-boot.bin fip/bl33.bin

$ sh fip/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

$ sh fip/blx_fix.sh \
     fip/bl2.bin \
     fip/zero_tmp \
     fip/bl2_zero.bin \
     fip/acs.bin \
     fip/bl21_zero.bin \
     fip/bl2_new.bin \
     bl2

$ $FIPDIR/g12b/aml_encrypt_g12b --bl30sig --input fip/bl30_new.bin \
                                          --output fip/bl30_new.bin.g12a.enc \
                                          --level v3
$ $FIPDIR/g12b/aml_encrypt_g12b --bl3sig --input fip/bl30_new.bin.g12a.enc \
                                         --output fip/bl30_new.bin.enc \
                                         --level v3 --type bl30
$ $FIPDIR/g12b/aml_encrypt_g12b --bl3sig --input fip/bl31.img \
                                         --output fip/bl31.img.enc \
                                         --level v3 --type bl31
$ $FIPDIR/g12b/aml_encrypt_g12b --bl3sig --input fip/bl33.bin --compress lz4 \
                                         --output fip/bl33.bin.enc \
                                         --level v3 --type bl33
$ $FIPDIR/g12b/aml_encrypt_g12b --bl2sig --input fip/bl2_new.bin \
                                         --output fip/bl2.n.bin.sig
$ $FIPDIR/g12b/aml_encrypt_g12b --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 \
                                --ddrfw1 fip/ddr4_1d.fw \
                                --ddrfw2 fip/ddr4_2d.fw \
                                --ddrfw3 fip/ddr3_1d.fw \
                                --ddrfw4 fip/piei.fw \
                                --ddrfw5 fip/lpddr4_1d.fw \
                                --ddrfw6 fip/lpddr4_2d.fw \
                                --ddrfw7 fip/diag_lpddr4.fw \
                                --ddrfw8 fip/aml_ddr.fw \
                                --level v3

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