Improve documentation.
Signed-off-by: Christian Hewitt christianshewitt@gmail.com --- doc/board/amlogic/libretech-cc.rst | 109 +++++++++++------------------ 1 file changed, 40 insertions(+), 69 deletions(-)
diff --git a/doc/board/amlogic/libretech-cc.rst b/doc/board/amlogic/libretech-cc.rst index 596ce45dc4..d1d3ce49f6 100644 --- a/doc/board/amlogic/libretech-cc.rst +++ b/doc/board/amlogic/libretech-cc.rst @@ -1,12 +1,12 @@ .. SPDX-License-Identifier: GPL-2.0+
-U-Boot for LibreTech CCs -======================== +U-Boot for LibreTech CC 'LePotato' (S905X) +==========================================
-LibreTech CC is a single board computer manufactured by Libre Technology -with the following specifications: +LibreTech CC is a Single Board Computer manufactured by Libre Computer Technology with +the following specifications:
-V1: +v1:
- Amlogic S905X ARM Cortex-A53 quad-core SoC @ 1.5GHz - ARM Mali 450 GPU @@ -19,14 +19,14 @@ V1: - Infrared receiver - Jack for CVBS and Audio
-V2: +v2:
- Added SPI NOR - Removed Jack
Schematics are available on the manufacturer website.
-U-Boot compilation +U-Boot Compilation ------------------
.. code-block:: bash @@ -37,36 +37,20 @@ U-Boot compilation
Use libretech-cc_v2_defconfig for v2.
-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/. These -apply to both v1 and v2. - -For simplified usage, pleaser refer to :doc:`pre-generated-fip` with codename `lepotato` - -Download and extract the libretech-cc release from there, and set FIPDIR to -point to the `fip` subdirectory. +U-Boot Signing with Pre-Built FIP repo +--------------------------------------
.. code-block:: bash + $ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1 + $ cd amlogic-boot-fip + $ mkdir my-output-dir + $ ./build-fip.sh lepotato /path/to/u-boot/u-boot.bin my-output-dir
- $ export FIPDIR=/path/to/extracted/fip +U-Boot Manual Signing +---------------------
-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. +Amlogic does not provide sources for the firmware and tools needed to create a bootloader +image so it is necessary to obtain binaries from sources published by the board vendor:
.. code-block:: bash
@@ -81,9 +65,7 @@ are suggested by Amlogic, and they are 32-bit x86 binaries. $ 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 : +Go back to the mainline U-Boot source tree then:
.. code-block:: bash
@@ -98,51 +80,40 @@ everything together. Go back to mainline U-Boot source tree then : $ 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 + 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 + 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 + --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: +Then write U-Boot to SD or eMMC with:
.. code-block:: bash
- $ DEV=/dev/your_sd_device + $ DEV=/dev/boot_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. + $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=440