Based on spruhe5c info, I have succesfully set a password and managed to unlock/unsecure Zone2. Status Z2_CR (0x0BD9) starts at 0x0040 (dummy read done) and goes to 0x0060 (pasword matched) after unlocking.
Writing 0x8000 to Z2_CR does again secure the zone and sets status Z2_CR to 0.
From this point, attempts to unlock Z2 again have failed. I have not managed to get do a successfull dummy read and get Z2_CR from 0 to 0x04. What is the exact sequence needed to do this?
The datasheet menstions that at startup this is done in bootrom, but I want to do this switching between secure and unsecure in usercode.
(BTW, this is on a instaspin device so Zone_1 is reserved/locked for that.)
Thanks,
Harry
