Posted on March 14, 2006 at 10:47Hi, All.
I'm writing bootloader for st7mc2s5t6 and i got a problem. i can not erase option bytes. steps i am doing:
1) unlock rass
2)12v on Vpp switch on
3) erasing option bytes -- operation failed :-[
I get exactly this status code after command execution.
My programming frequency is ok. all sectors are erased and flashed. i do not use readout protection. option bytes code for HDFlashEraseSector() function is 0x0f.
What is wrong?
One more thing i do not understand:
i made a loop, which executes HDFlashEraseSector() function with values range from 3 up to 255. And with some values in the range 170-180 this function returns ''Operation successful'' and option bytes are 0xff 0xff. What does it mean?
Tnx in advance.
