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.. SPDX-License-Identifier: GPL-2.0+
U-Boot for LibreTech-AC 'LaFrite' (S805X)
=========================================
LibreTech-AC aka 'LaFrite' is a Single Board Computer manufactured by Libre Computer
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
- SPI NOR Flash
- Removable eMMC module
- Infrared receiver
Schematics are available on the manufacturer website.
U-Boot Compilation
------------------
.. code-block:: bash
$ export CROSS_COMPILE=aarch64-none-elf-
$ make libretech-ac_defconfig
$ make
U-Boot Signing with Pre-Built FIP repo
--------------------------------------
.. code-block:: bash
$ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
$ cd amlogic-boot-fip
$ mkdir my-output-dir
$ ./build-fip.sh lafrite /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:
.. code-block:: bash
$ 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:
.. code-block:: bash
$ 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 the mainline U-Boot source tree then:
.. code-block:: bash
$ 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
Then write U-Boot to USB or SPI-NOR with:
.. code-block:: bash
$ 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
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