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AM62A7-Q1: yocto build for am62a project

Part Number: AM62A7-Q1

Hello:

Right now i have modify the am62a linux and uboot. and i have make some patch in the yocoto project. And i can build the project. but there is a problem. 
1. I have change the makefile_linux. I do not know how to update the makerule in yocoto project
2. Right now i use the falcon mode to skip the uboot step. and i have run a scripts in the project to manual update the spl.bin and transfer to the project.  how i add this step in the yocoto project. thanks very much

3.  the system dose not startup using systemd service. I will using the myinit.sh script as the init. How i add this into the yocoto project. thanks very much

Here is the detail change of linux falcon mode. I need to add this into yocoto project

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1510026/am62a7-soc-system-startup-time-is-more-than-20s/5841837?tisearch=e2e-sitesearch&keymatch=%25252525252520user%2525252525253A643802