Startup process of uboot:

uboot Startup process ：

The first stage : Hardware initialization For loading bootloader Get ready RAM Space Copy the code to the second stage RAM Space Set the stack Jump to the second stage C entry point

The second stage : Hardware equipment used in the initial stage Detect system memory mapping Put the kernel , The root file system is from FLASH Read RAM Set the boot parameters for the kernel Call kernel

Reference resources ：https://blog.51cto.com/u_14653665/5114138