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| author | Chris Morgan <macromorgan@hotmail.com> | 2023-05-15 11:00:32 -0500 |
|---|---|---|
| committer | Kever Yang <kever.yang@rock-chips.com> | 2023-07-28 18:45:02 +0800 |
| commit | 182d0ba6d6fe2155571babcc7b09f7a838e00e92 (patch) | |
| tree | 0a0a5f054850c78ecf99ad69a85a8b754f0675fe /doc | |
| parent | 12b715bd4f7847358b2d3f6d454e0f8136c9be12 (diff) | |
| download | u-boot-182d0ba6d6fe2155571babcc7b09f7a838e00e92.zip u-boot-182d0ba6d6fe2155571babcc7b09f7a838e00e92.tar.gz u-boot-182d0ba6d6fe2155571babcc7b09f7a838e00e92.tar.bz2 | |
doc: anbernic: Update RGxx3 Docs for panel detection
Update the Anbernic RGxx3 documentation to note that panel detection
has been added and how it works.
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/board/anbernic/rgxx3.rst | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/doc/board/anbernic/rgxx3.rst b/doc/board/anbernic/rgxx3.rst index afa7538..7d1beb4 100644 --- a/doc/board/anbernic/rgxx3.rst +++ b/doc/board/anbernic/rgxx3.rst @@ -7,27 +7,36 @@ This allows U-Boot to boot the following Anbernic devices: - Anbernic RG353M - Anbernic RG353P + - Anbernic RG353PS - Anbernic RG353V - Anbernic RG353VS - Anbernic RG503 The correct device is detected automatically by comparing ADC values -from ADC channel 1. In the event of an RG353V, an attempt is then made -to probe for an eMMC and if it fails the device is assumed to be an -RG353VS. Based on the detected device, the environment variables -"board", "board_name", and "fdtfile" are set to the correct values -corresponding to the board which can be read by a boot script to boot -with the correct device tree. - -Please note that there are some versions of the RG353 devices with -different panels. Panel auto-detection is planned for a later date. +from ADC channel 1. In the event of an RG353V or RG353P, an attempt +is then made to probe for an eMMC and if it fails the device is assumed +to be an RG353VS or RG353PS. Based on the detected device, the +environment variables "board", "board_name", and "fdtfile" are set to +the correct values corresponding to the board which can be read by a +boot script to boot with the correct device tree. If the board detected +is not of type RG503 (which currently has only 1 panel revision) a +panel detect is then performed by probing a "dummy" display on the DSI +bus and then querying the display ID. The display ID is then compared +to a table to get the known compatible string for use in Linux, and +this string is saved as an environment variable of "panel". + +FDT fixups are performed in the event of an RG353M to change the device +name, or in the event the panel detected does not match the devicetree. +This allows Linux to load the correct panel driver without having to +know exactly which panel is used (as there is no user distingushable +way to tell). Building U-Boot --------------- .. code-block:: bash - $ export CROSS_COMPILE=aarch64-none-elf- + $ export CROSS_COMPILE=aarch64-linux-gnu- $ export BL31=../rkbin/bin/rk35/rk3568_bl31_v1.34.elf $ export ROCKCHIP_TPL=../rkbin/bin/rk35/rk3568_ddr_1056MHz_v1.13.bin $ make anbernic-rgxx3_defconfig @@ -40,7 +49,7 @@ Image installation ------------------ Write the ``u-boot-rockchip.bin`` to an SD card offset 32kb from the -start. +start. Please note that eMMC booting has not been tested at this time. .. code-block:: bash |