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doc: mediatek: add documentation for mt7621 reference boards

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The MT7621 requires external binary blob being executed during u-boot's
boot-up flow. It's necessary to provide a guide here for users to correctly
build the u-boot.

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
This commit is contained in:
Weijie Gao 2022-05-20 11:22:31 +08:00 committed by Daniel Schwierzeck
parent 0eaee027f7
commit 46c7e9ed03
3 changed files with 58 additions and 0 deletions
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1
doc/board/index.rst
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@ -23,6 +23,7 @@ Board-specific doc
highbank/index
intel/index
kontron/index
mediatek/index
microchip/index
nokia/index
nxp/index

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doc/board/mediatek/index.rst Normal file
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@ -0,0 +1,9 @@
.. SPDX-License-Identifier: GPL-2.0+
Mediatek
=========
.. toctree::
:maxdepth: 2
mt7621

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doc/board/mediatek/mt7621.rst Normal file
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.. SPDX-License-Identifier: GPL-2.0
mt7621_rfb/mt7621_nand_rfb
==========================
U-Boot for the MediaTek MT7621 boards
Quick Start
-----------
- Get the DDR initialization binary blob
- Configure CPU and DDR parameters
- Build U-Boot
Get the DDR initialization binary blob
--------------------------------------
Download one from:
- https://raw.githubusercontent.com/mtk-openwrt/mt7621-lowlevel-preloader/master/mt7621_stage_sram.bin
- https://raw.githubusercontent.com/mtk-openwrt/mt7621-lowlevel-preloader/master/mt7621_stage_sram_noprint.bin
mt7621_stage_sram_noprint.bin has removed all output logs. To use this one,
download and rename it to mt7621_stage_sram.bin
Put the binary blob to the u-boot build directory.
Configure CPU and DDR parameters
--------------------------------
menuconfig > MIPS architecture > MediaTek MIPS platforms > CPU & DDR configuration
Select the correct DDR timing parameters for your board. The size shown here
must match the DDR size of you board.
The frequency of CPU and DDR can also be adjusted.
Build U-Boot
------------
.. code-block:: bash
$ export CROSS_COMPILE=mipsel-linux-
$ make O=build mt7621_rfb_defconfig # or mt7621_nand_rfb_defconfig
$ cp mt7621_stage_sram.bin ./build/mt7621_stage_sram.bin
$ # or cp mt7621_stage_sram_noprint.bin ./build/mt7621_stage_sram.bin
$ make O=build
Burn the u-boot-mt7621.bin to the SPI-NOR or NAND flash.