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