STM32 READ OUT PROTECTION LEVEL 2 using openocd

Question

The STM32 has a read-out protection level 2 feature so code can't be read out via the debug interface (SWD).

Using OpenOCD, how can I enable the read-out protection LEVEL 2 via a SWD interface?

0___________ · Answer 1 · 2020-06-18T13:41:01.923

0

you will ned to write the script unloncking option bytes and programming them.

Use st-link utility instead

edited Jun 18 '20 at 13:41

answered Jun 18 '20 at 12:55

0___________

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It is windows based application I want to program the stm through raspberry pi. Need to enable the read protection level 2. – kahan Jun 18 '20 at 13:39
@kahan then write the script – 0___________ Jun 18 '20 at 13:41
can you show me how can we achive this through script ? – kahan Jun 21 '20 at 12:35

score 0 · Answer 2 · answered Apr 28 '21 at 12:26

openocd script for STM32F42x:

// unlock Option bytes
mww 0x40023C08 0x08192A3B; // OPT key1
mww 0x40023C08 0x4C5D6E7F; // OPT key2
mdw 0x40023c0c // wait until returns 00000000 that signifies flash write done

mww 0x40023C14 0x8000AAEC; // enable SPRMOD (8), disable write protection
mww 0x40023C18 0x00000000;
mww 0x40023C14 0x8000AAEE; // execute option start
mdw 0x40023c0c // wait until returns 00000000 that signifies flash write done

// at this point SPRMOD should be set, but no protection. Now invert protection bits
mww 0x40023C14 0x8FFFCCEC; // enable WRP on bank 1 and read protection lvl2
mww 0x40023C18 0x0FFF0000; // WRP on bank 2
mww 0x40023C14 0x8FFFCCEE; // execute option start
mdw 0x40023c0c // wait until returns 00000000 that signifies flash write done

Note, I haven't done this myself (at least not intentionally), but reference manual is your friend.

Note 2: this might brick your MCU

STM32 READ OUT PROTECTION LEVEL 2 using openocd

2 Answers2