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-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 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