| U-Boot for LibreTech AC |
| ======================= |
| |
| LibreTech AC is a single board computer manufactured by Libre Technology |
| with the following specifications: |
| |
| - Amlogic S805X ARM Cortex-A53 quad-core SoC @ 1.2GHz |
| - ARM Mali 450 GPU |
| - 512MiB DDR4 SDRAM |
| - 10/100 Ethernet |
| - HDMI 2.0 4K/60Hz display |
| - 40-pin GPIO header |
| - 4 x USB 2.0 Host |
| - eMMC, SPI NOR Flash |
| - Infrared receiver |
| |
| Schematics are available on the manufacturer website. |
| |
| Currently the U-Boot port supports the following devices: |
| - serial |
| - eMMC |
| - Ethernet |
| - USB |
| |
| U-Boot compilation |
| ================== |
| |
| > export ARCH=arm |
| > export CROSS_COMPILE=aarch64-none-elf- |
| > make libretech-ac_defconfig |
| > make |
| |
| Image creation |
| ============== |
| |
| Amlogic doesn't provide sources for the firmware and for tools needed |
| to create the bootloader image, so it is necessary to obtain them from |
| the git tree 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:$PATH |
| > git clone https://github.com/BayLibre/u-boot.git -b libretech-ac amlogic-u-boot |
| > cd amlogic-u-boot |
| > wget https://raw.githubusercontent.com/BayLibre/u-boot/libretech-cc/fip/blx_fix.sh |
| > make libretech_ac_defconfig |
| > make |
| > export UBOOTDIR=$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_20180418.tar.gz |
| > tar xfz buildroot_openlinux_kernel_4.9_fbdev_20180418.tar.gz buildroot_openlinux_kernel_4.9_fbdev_20180418/bootloader |
| > export BRDIR=$PWD/buildroot_openlinux_kernel_4.9_fbdev_20180418 |
| |
| Go back to mainline U-Boot source tree then : |
| > mkdir fip |
| |
| > cp $UBOOTDIR/build/scp_task/bl301.bin fip/ |
| > cp $UBOOTDIR/build/board/amlogic/libretech_ac/firmware/bl21.bin fip/ |
| > cp $UBOOTDIR/build/board/amlogic/libretech_ac/firmware/acs.bin fip/ |
| > cp $BRDIR/bootloader/uboot-repo/bl2/bin/gxl/bl2.bin fip/ |
| > cp $BRDIR/bootloader/uboot-repo/bl30/bin/gxl/bl30.bin fip/ |
| > cp $BRDIR/bootloader/uboot-repo/bl31/bin/gxl/bl31.img fip/ |
| > cp u-boot.bin fip/bl33.bin |
| |
| > sh $UBOOTDIR/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 |
| |
| > $BRDIR/bootloader/uboot-repo/fip/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0 |
| |
| > sh $UBOOTDIR/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 |
| |
| > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin |
| > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img |
| > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin |
| > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig |
| > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bootmk \ |
| --output fip/u-boot.bin \ |
| --bl2 fip/bl2.n.bin.sig \ |
| --bl30 fip/bl30_new.bin.enc \ |
| --bl31 fip/bl31.img.enc \ |
| --bl33 fip/bl33.bin.enc |
| |
| and then write the image to SD with: |
| |
| > DEV=/dev/your_sd_device |
| > dd if=fip/u-boot.bin.sd.bin of=$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 |
