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doc: boards: amlogic: update documentation for LePotato
Improve documentation. Signed-off-by: Christian Hewitt <christianshewitt@gmail.com> Link: https://lore.kernel.org/r/20230320114609.930145-14-christianshewitt@gmail.com [narmstrong: fixed doc build] Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
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Christian Hewitt
Neil Armstrong
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@ -1,12 +1,12 @@
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.. SPDX-License-Identifier: GPL-2.0+
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U-Boot for LibreTech CCs
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========================
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U-Boot for LibreTech CC 'LePotato' (S905X)
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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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LibreTech CC is a Single Board Computer manufactured by Libre Computer Technology with
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the following specifications:
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V1:
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v1:
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- Amlogic S905X ARM Cortex-A53 quad-core SoC @ 1.5GHz
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- ARM Mali 450 GPU
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@ -19,14 +19,14 @@ V1:
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- Infrared receiver
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- Jack for CVBS and Audio
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V2:
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v2:
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- Added SPI NOR
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- Removed Jack
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Schematics are available on the manufacturer website.
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U-Boot compilation
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U-Boot Compilation
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------------------
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.. code-block:: bash
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@ -37,36 +37,21 @@ U-Boot compilation
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Use libretech-cc_v2_defconfig for v2.
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Image creation
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--------------
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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/>. These
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apply to both v1 and v2.
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For simplified usage, pleaser refer to :doc:`pre-generated-fip` with codename `lepotato`
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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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U-Boot Signing with Pre-Built FIP repo
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--------------------------------------
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.. code-block:: bash
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$ export FIPDIR=/path/to/extracted/fip
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$ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
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$ cd amlogic-boot-fip
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$ mkdir my-output-dir
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$ ./build-fip.sh lepotato /path/to/u-boot/u-boot.bin my-output-dir
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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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U-Boot Manual Signing
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---------------------
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Amlogic does not provide sources for the firmware and tools needed to create a bootloader
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image so it is necessary to obtain binaries from sources published by the board vendor:
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.. code-block:: bash
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@ -81,9 +66,7 @@ are suggested by Amlogic, and they are 32-bit x86 binaries.
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$ make
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$ export FIPDIR=$PWD/fip
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Once you have the binaries available (either through the prebuilt download,
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or having built the vendor u-boot yourself), you can then proceed to glue
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everything together. Go back to mainline U-Boot source tree then :
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Go back to the mainline U-Boot source tree then:
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.. code-block:: bash
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@ -98,51 +81,40 @@ everything together. Go back to mainline U-Boot source tree then :
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$ cp u-boot.bin fip/bl33.bin
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$ $FIPDIR/blx_fix.sh \
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fip/bl30.bin \
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fip/zero_tmp \
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fip/bl30_zero.bin \
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fip/bl301.bin \
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fip/bl301_zero.bin \
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fip/bl30_new.bin \
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bl30
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fip/bl30.bin \
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fip/zero_tmp \
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fip/bl30_zero.bin \
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fip/bl301.bin \
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fip/bl301_zero.bin \
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fip/bl30_new.bin \
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bl30
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$ $FIPDIR/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
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$ $FIPDIR/blx_fix.sh \
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fip/bl2_acs.bin \
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fip/zero_tmp \
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fip/bl2_zero.bin \
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fip/bl21.bin \
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fip/bl21_zero.bin \
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fip/bl2_new.bin \
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bl2
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fip/bl2_acs.bin \
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fip/zero_tmp \
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fip/bl2_zero.bin \
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fip/bl21.bin \
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fip/bl21_zero.bin \
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fip/bl2_new.bin \
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bl2
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$ $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
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$ $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img
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$ $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin
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$ $FIPDIR/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
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$ $FIPDIR/gxl/aml_encrypt_gxl --bootmk \
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--output fip/u-boot.bin \
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--bl2 fip/bl2.n.bin.sig \
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--bl30 fip/bl30_new.bin.enc \
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--bl31 fip/bl31.img.enc \
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--bl33 fip/bl33.bin.enc
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--output fip/u-boot.bin \
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--bl2 fip/bl2.n.bin.sig \
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--bl30 fip/bl30_new.bin.enc \
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--bl31 fip/bl31.img.enc \
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--bl33 fip/bl33.bin.enc
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and then write the image to SD with:
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Then write U-Boot to SD or eMMC with:
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.. code-block:: bash
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$ DEV=/dev/your_sd_device
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$ DEV=/dev/boot_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=$DEV conv=fsync,notrunc bs=1 count=444
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Note that Amlogic provides aml_encrypt_gxl as a 32-bit x86 binary with no
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source code. Should you prefer to avoid that, there are open source reverse
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engineered versions available:
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1. gxlimg <https://github.com/repk/gxlimg>, which comes with a handy
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Makefile that automates the whole process.
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2. meson-tools <https://github.com/afaerber/meson-tools>
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However, these community-developed alternatives are not endorsed by or
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supported by Amlogic.
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$ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=440
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