Holy shit, why are u so fast
I am still struggling with u-boot

The technical reference manual is not finished yet, sorry.

OK :roll:
There is another point: I find your current approach quite unusual. You are enabling the mwdt, rwdt, and swd simultaneously within the BootROM; in reality, this should be handled in the bootloader, and hardcoding it into the ...

I just wanna run u-boot on it, but I can only find out the address of peripherals by esp-idf sdk
Could you please provide the Technical Reference Sheet ?