====== U-BOOT ======

===== - 一般操作 =====
  # Interupt booting process
  Ctrl + C
  
  setenv baudrate 115200

===== - 常用命令 =====
  # check env
  printenv
  
  setenv
  saveenv
  
  
===== - RK3568 =====

  # Config file, .config and *deconfig
  # .config is generated from *deconfig and make menuconfig.
  u-boot/configs/firefly-rk3568_defconfig
  u-boot/.config