在 kernel init 中修改 u-boot 环境

Question

I'm trying to modify a u-boot env arg within the kernel code. I've found boot_command_line var in main.c and setup.c , which contains an arg, so that made me think it is possible, however, I coudn't find where this var is being updated with the u-boot env arg value, or how to get a different arg and then write it back

Answer 1

This is the wrong approach. There are user-space tools to access the U-Boot environment, fw_printenv and fw_setenv and that's how you access the environment outside of U-Boot.