Postby Prinfor » Sun May 12, 2019 9:30 pm
I suppose that internal system ROM in the chip is located at 40000000 and contains basic system functions. In case if you have sdk please find a file "eagle.rom.addr.v6.ld" and it lists all the functions in there. That allows uart and download routines to program an external flash. I think It reads the 3 GPIO boot mode pins.
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