1.. SPDX-License-Identifier: GPL-2.0
2
3mt7621_rfb/mt7621_nand_rfb
4==========================
5
6U-Boot for the MediaTek MT7621 boards
7
8Quick Start
9-----------
10
11- Get the DDR initialization binary blob
12- Configure CPU and DDR parameters
13- Build U-Boot
14
15Get the DDR initialization binary blob
16--------------------------------------
17
18Download one from:
19 - https://raw.githubusercontent.com/mtk-openwrt/mt7621-lowlevel-preloader/master/mt7621_stage_sram.bin
20 - https://raw.githubusercontent.com/mtk-openwrt/mt7621-lowlevel-preloader/master/mt7621_stage_sram_noprint.bin
21
22mt7621_stage_sram_noprint.bin has removed all output logs. To use this one,
23download and rename it to mt7621_stage_sram.bin
24
25Put the binary blob to the u-boot build directory.
26
27Configure CPU and DDR parameters
28--------------------------------
29
30menuconfig > MIPS architecture > MediaTek MIPS platforms > CPU & DDR configuration
31
32Select the correct DDR timing parameters for your board. The size shown here
33must match the DDR size of you board.
34
35The frequency of CPU and DDR can also be adjusted.
36
37Build U-Boot
38------------
39
40.. code-block:: bash
41
42   $ export CROSS_COMPILE=mipsel-linux-
43   $ make O=build mt7621_rfb_defconfig # or mt7621_nand_rfb_defconfig
44   $ cp mt7621_stage_sram.bin ./build/mt7621_stage_sram.bin
45   $ # or cp mt7621_stage_sram_noprint.bin ./build/mt7621_stage_sram.bin
46   $ make O=build
47
48Burn the u-boot-mt7621.bin to the SPI-NOR or NAND flash.
49