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board: amlogic: document alternative libretech-cc installation methods

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As already documented in this README, several binaries must be
glued together in order to boot the device.

Extend the documentation to cover the prebuilt binaries
(saving you the hassle of installing ancient cross-compilers),
and also mention the open source replacements for the encryption
tool (which is especially useful if you want to avoid requiring
32-bit x86 binaries in your build system).

Signed-off-by: Daniel Drake <drake@endlessm.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Daniel Drake 2019-08-06 16:10:42 +08:00 committed by Neil Armstrong
parent a2fce50455
commit 4ae9747804
1 changed files with 37 additions and 4 deletions
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41
board/amlogic/p212/README.libretech-cc
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@ -38,9 +38,28 @@ U-Boot compilation
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:
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
@ -53,7 +72,10 @@ the git tree published by the board vendor:
> make
> export FIPDIR=$PWD/fip
Go back to mainline U-Boot source tree then :
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 $FIPDIR/gxl/bl2.bin fip/
@ -100,3 +122,14 @@ and then write the image to SD with:
> DEV=/dev/your_sd_device
> dd if=fip/u-boot.bin.sd.bin of=$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.