1 U-Boot for LibreTech CC
2 =======================
4 LibreTech CC is a single board computer manufactured by Libre Technology
5 with the following specifications:
7 - Amlogic S905X ARM Cortex-A53 quad-core SoC @ 1.5GHz
11 - HDMI 2.0 4K/60Hz display
17 Schematics are available on the manufacturer website.
19 Currently the U-Boot port supports the following devices:
34 > export CROSS_COMPILE=aarch64-none-elf-
35 > make libretech-cc_defconfig
41 To boot the system, u-boot must be combined with several earlier stage
44 * bl2.bin: vendor-provided binary blob
45 * bl21.bin: built from vendor u-boot source
46 * bl30.bin: vendor-provided binary blob
47 * bl301.bin: built from vendor u-boot source
48 * bl31.bin: vendor-provided binary blob
49 * acs.bin: built from vendor u-boot source
51 These binaries and the tools required below have been collected and prebuilt
52 for convenience at <https://github.com/BayLibre/u-boot/releases/>
54 Download and extract the libretech-cc release from there, and set FIPDIR to
55 point to the `fip` subdirectory.
57 > export FIPDIR=/path/to/extracted/fip
59 Alternatively, you can obtain the original vendor u-boot tree which
60 contains the required blobs and sources, and build yourself.
61 Note that old compilers are required for this to build. The compilers here
62 are suggested by Amlogic, and they are 32-bit x86 binaries.
64 > wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
65 > wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
66 > tar xvfJ gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
67 > tar xvfJ gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
68 > 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:$PATH
69 > git clone https://github.com/BayLibre/u-boot.git -b libretech-cc amlogic-u-boot
71 > make libretech_cc_defconfig
73 > export FIPDIR=$PWD/fip
75 Once you have the binaries available (either through the prebuilt download,
76 or having built the vendor u-boot yourself), you can then proceed to glue
77 everything together. Go back to mainline U-Boot source tree then :
81 > cp $FIPDIR/gxl/bl2.bin fip/
82 > cp $FIPDIR/gxl/acs.bin fip/
83 > cp $FIPDIR/gxl/bl21.bin fip/
84 > cp $FIPDIR/gxl/bl30.bin fip/
85 > cp $FIPDIR/gxl/bl301.bin fip/
86 > cp $FIPDIR/gxl/bl31.img fip/
87 > cp u-boot.bin fip/bl33.bin
89 > $FIPDIR/blx_fix.sh \
98 > $FIPDIR/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
100 > $FIPDIR/blx_fix.sh \
109 > $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
110 > $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img
111 > $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin
112 > $FIPDIR/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
113 > $FIPDIR/gxl/aml_encrypt_gxl --bootmk \
114 --output fip/u-boot.bin \
115 --bl2 fip/bl2.n.bin.sig \
116 --bl30 fip/bl30_new.bin.enc \
117 --bl31 fip/bl31.img.enc \
118 --bl33 fip/bl33.bin.enc
120 and then write the image to SD with:
122 > DEV=/dev/your_sd_device
123 > dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
124 > dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=444
126 Note that Amlogic provides aml_encrypt_gxl as a 32-bit x86 binary with no
127 source code. Should you prefer to avoid that, there are open source reverse
128 engineered versions available:
130 1. gxlimg <https://github.com/repk/gxlimg>, which comes with a handy
131 Makefile that automates the whole process.
132 2. meson-tools <https://github.com/afaerber/meson-tools>
134 However, these community-developed alternatives are not endorsed by or
135 supported by Amlogic.