2017-11-27 09:16:19 +00:00
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U-Boot for LibreTech CC
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=======================
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LibreTech CC is a single board computer manufactured by Libre Technology
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with the following specifications:
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2018-06-27 15:19:02 +00:00
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- Amlogic S905X ARM Cortex-A53 quad-core SoC @ 1.5GHz
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2017-11-27 09:16:19 +00:00
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- ARM Mali 450 GPU
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- 2GB DDR3 SDRAM
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2018-06-27 15:19:02 +00:00
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- 10/100 Ethernet
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2017-11-27 09:16:19 +00:00
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- HDMI 2.0 4K/60Hz display
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- 40-pin GPIO header
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2018-06-27 15:19:02 +00:00
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- 4 x USB 2.0 Host
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2017-11-27 09:16:19 +00:00
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- eMMC, microSD
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- Infrared receiver
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Schematics are available on the manufacturer website.
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Currently the U-Boot port supports the following devices:
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- serial
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- eMMC, microSD
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- Ethernet
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2018-06-27 15:19:02 +00:00
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- I2C
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- Regulators
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- Reset controller
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- Clock controller
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- USB Host
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- ADC
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2017-11-27 09:16:19 +00:00
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U-Boot compilation
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==================
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> export CROSS_COMPILE=aarch64-none-elf-
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> make libretech-cc_defconfig
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> make
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Image creation
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==============
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2019-08-06 08:10:42 +00:00
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To boot the system, u-boot must be combined with several earlier stage
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bootloaders:
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* bl2.bin: vendor-provided binary blob
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* bl21.bin: built from vendor u-boot source
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* bl30.bin: vendor-provided binary blob
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* bl301.bin: built from vendor u-boot source
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* bl31.bin: vendor-provided binary blob
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* acs.bin: built from vendor u-boot source
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These binaries and the tools required below have been collected and prebuilt
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for convenience at <https://github.com/BayLibre/u-boot/releases/>
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Download and extract the libretech-cc release from there, and set FIPDIR to
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point to the `fip` subdirectory.
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> export FIPDIR=/path/to/extracted/fip
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Alternatively, you can obtain the original vendor u-boot tree which
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contains the required blobs and sources, and build yourself.
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Note that old compilers are required for this to build. The compilers here
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are suggested by Amlogic, and they are 32-bit x86 binaries.
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2017-11-27 09:16:19 +00:00
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> wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
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> wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
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> tar xvfJ gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
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> tar xvfJ gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
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> 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:$PATH
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> git clone https://github.com/BayLibre/u-boot.git -b libretech-cc amlogic-u-boot
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> cd amlogic-u-boot
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> make libretech_cc_defconfig
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> make
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> export FIPDIR=$PWD/fip
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2019-08-06 08:10:42 +00:00
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Once you have the binaries available (either through the prebuilt download,
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or having built the vendor u-boot yourself), you can then proceed to glue
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everything together. Go back to mainline U-Boot source tree then :
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2017-11-27 09:16:19 +00:00
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> mkdir fip
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> cp $FIPDIR/gxl/bl2.bin fip/
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> cp $FIPDIR/gxl/acs.bin fip/
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> cp $FIPDIR/gxl/bl21.bin fip/
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> cp $FIPDIR/gxl/bl30.bin fip/
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> cp $FIPDIR/gxl/bl301.bin fip/
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> cp $FIPDIR/gxl/bl31.img fip/
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> cp u-boot.bin fip/bl33.bin
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> $FIPDIR/blx_fix.sh \
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fip/bl30.bin \
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fip/zero_tmp \
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fip/bl30_zero.bin \
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fip/bl301.bin \
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fip/bl301_zero.bin \
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fip/bl30_new.bin \
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bl30
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> $FIPDIR/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
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> $FIPDIR/blx_fix.sh \
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fip/bl2_acs.bin \
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fip/zero_tmp \
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fip/bl2_zero.bin \
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fip/bl21.bin \
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fip/bl21_zero.bin \
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fip/bl2_new.bin \
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bl2
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> $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
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> $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img
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> $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin
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> $FIPDIR/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
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> $FIPDIR/gxl/aml_encrypt_gxl --bootmk \
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--output fip/u-boot.bin \
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--bl2 fip/bl2.n.bin.sig \
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--bl30 fip/bl30_new.bin.enc \
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--bl31 fip/bl31.img.enc \
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--bl33 fip/bl33.bin.enc
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and then write the image to SD with:
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> DEV=/dev/your_sd_device
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> dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
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> dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=444
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2019-08-06 08:10:42 +00:00
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Note that Amlogic provides aml_encrypt_gxl as a 32-bit x86 binary with no
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source code. Should you prefer to avoid that, there are open source reverse
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engineered versions available:
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1. gxlimg <https://github.com/repk/gxlimg>, which comes with a handy
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Makefile that automates the whole process.
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2. meson-tools <https://github.com/afaerber/meson-tools>
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However, these community-developed alternatives are not endorsed by or
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supported by Amlogic.
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