Bootstrap questions

I have 32k words of flash at external address 0 on a C167CR-LM board. I load a preloader at 0fa40h and a loader at 0e000h. I want to burn the flash in bootstrap mode. If I clear SYSCON's ROMEN bit in my loader when running in internal RAM, does the internal BSL rom disappear immediately, or is there an instruction sequence I have to execute before the SYSCON change takes effect? I have not yet set EINIT.

My bootstrap code works on an emulator but not on a native board.

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