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STM32L152 no JTAG after wrong page erase

Question asked by wichert.henrik on Aug 8, 2015
Latest reply on Aug 10, 2015 by wichert.henrik
after an (possibly) invalid page erase attemp I can't reach the micro controller via JTAG.

Here is the scenario:
I have a bootloader (location 0x8000000 to 0x8003FFF).
And a firmware (location 0x8004000 and above).
Also there is a external EEPROM attached via SPI to buffer data for updates of subcomponents as well as of the bootloader (it can't overwrite itself).

I tried to update the bootloader from within my firmware, but instead of the addresses from 0x8000000 to 0x8003FFF I used the addresses 0x0 to 0x3FFF for the page erase and write word functions of the ST library. It seemed practial to me because it was the same address in the EEPROM as in the micro controller and I assumed that it was vaild because of the memory remapping of address 0x0 to 0x8000000.
But the update did not work and now I can't even reach the micro controller via JTAG.
Looking at the library I saw that there is a check of the address and 0x0 seems to be invalid. Unfortunately the assert_param macro was disabled.
So what may have happened and how could I fix it?