Hello,
U-boot source codes are located in git repository.
For example, for the recent Linux BSP, customers can refer to Chapter 3 (Porting U-Boot)
in "i.MX_BSP_Porting_Guide.pdf".
https://www.nxp.com/webapp/Download?colCode=L4.9.88_2.0.0_LINUX_DOCS&Parent_nodeId=13376994810717061...
Have a great day,
Yuri
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