Passwords for RDP1 and RDP2

[PChoq.780]

Hi there. Before attempting any password locking on my STM32575, I read the password lock location and it returned all zeroes like so

Reading 32-bit memory content

 Size     : 4 Bytes

 Address:   : 0x40022020

0x40022020 : 00000000

After setting the PW, it now returns non zero like so

Reading 32-bit memory content

 Size     : 4 Bytes

 Address:   : 0x40022020

0x40022020 : 000C0000

I've tried disabling the PW, writing to all zeroes and writing it to all FFs, but I can't get back to the point where all zeroes are returned. Can you advise how to get to that state?

thanks in advance

Paul

[FBL]

Hello @PChoq.780​ 

Do you mean STM32U575? If yes, how do you read the password lock location?

Note that:

• OEM1KEY can always be modified when RDP = 0. It can be changed when RDP = 0.5 or 1 if OEM1LOCK = 0.
• OEM2KEY can always be modified when RDP = 0 or 0.5. It can be changed when RDP = 1 if OEM2LOCK = 0.

[PChoq.780 · Accepted solution]

Hello F Belaid

I did figure this issue out. I needed to reset both RDP1 and RDP2 passwords. Thanks for reaching out

[FBL]

Thank you for your feedback.