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1. Compile the fw_printenv tool Execute under the uboot source path, and then generate the executable file of the fw _ printenv under tools/env. . /opt/fsl-imx-x11/4.1.15-2.0.0/environment-setup-cortexa7hf-neon-poky-linux-gnueabimake env 2. Configure fw_env.config file Modify the fw_env.config file under tools/env in the uboot source directory according to the mtd partition, the location and size of the UBOOT environment variables, etc. See the instructions in the fw_env.config file and the /tools/env/README file for specific modifications. Among them, Device offset, Env size, and Flash sector size should correspond respectively to the three macro definitions CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, and CONFIG_ENV_SECT_SIZE in the include/configs/xxxx.h file in the U-Boot source code directory. vi include/configs/mx6ul_14x14_evk.h Take the test 256nand as an example: CONFIG_ENV_OFFSET = 0x600000 ONFIG_ENV_SECT_SIZE = 0x20000 Open the tools/env/fw_env.config and modify as shown in the following figures: Take the test 1gnand as an example: CONFIG_ENV_OFFSET = 0x1000000 ONFIG_ENV_SECT_SIZE = 0x20000 nand model number MT29F8G08ABACA Refer to the manual to change the ENV_SECT_SIZE value to 256K. Open the tools/env/fw_env.config and modify as shown in the following figures: nand model number MT29F8G08ABABA Refer to the manual to change the ENV_SECT_SIZE value to 512K. Open the tools/env/fw_env.config and modify as shown in the following figures: 3. Copy the file Copy tools/env/fw_env.config to the /etc path of the development board; Copy tools/env/fw_printenv to the root file system of the development board under the path /usr/bin. And create a soft link to fw_setenv ln -s /usr/bin/fw_printenv /usr/bin/fw_setenv 4. Read and write environment variable test Read environment: Write environment variable: The uboot phase has been modified synchronously. 5. Problems and solutions Problem: make env reports an error in the uboot source code Solution: Comment out the CC in the top-level Makefile and use the environment variable in the CC.