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.
Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- v5 changes: none v4 changes: new --- doc/board/mediatek/mt7621.rst | 48 +++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 doc/board/mediatek/mt7621.rst
diff --git a/doc/board/mediatek/mt7621.rst b/doc/board/mediatek/mt7621.rst new file mode 100644 index 0000000000..4f400a4ca4 --- /dev/null +++ b/doc/board/mediatek/mt7621.rst @@ -0,0 +1,48 @@ +.. 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/mast... + - https://raw.githubusercontent.com/mtk-openwrt/mt7621-lowlevel-preloader/mast... + +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.