I am trying to get application level RDP progression into my bootloader to kind of self protect my firmware once it has started. I have set level 1 and the firmware still runs and I can no longer read out flash or debug, so that's the positive side.
But now I want to continue debugging the board, so I want to get back to level 0.
I already found out that (for whatever reason) the only way to at least start a connection is now to use Hotplug and only release the reset of the board by hand once Hotplug is selected.
But I can not read or write the option bytes or use the specific downgrade command.
What I tried and didn't work via CLI:
- ./STM32_Programmer_CLI.exe -c port=swd mode=HOTPLUG -rdu
- ./STM32_Programmer_CLI.exe -c port=swd mode=HOTPLUG -ob rdp=0xAA
UPLOADING OPTION BYTES DATA ...
Bank : 0x00
Address : 0x40022040
Size : 36 Bytes
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ 0%
Error: Uploading Option Bytes bank: 0 failed
Error: Initializing the Option Bytes failed
- ./STM32_Programmer_CLI.exe -c port=swd mode=HOTPLUG -ob rdp=0x55
UPLOADING OPTION BYTES DATA ...
Bank : 0x00
Address : 0x40022040
Size : 36 Bytes
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ 0%
Error: Uploading Option Bytes bank: 0 failed
Error: Initializing the Option Bytes failed
- ./STM32_Programmer_CLI.exe -c port=swd mode=HOTPLUG -ob OptByte=0x8BEFF0AA
UPLOADING OPTION BYTES DATA ...
Bank : 0x00
Address : 0x40022040
Size : 36 Bytes
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ 0%
Error: Uploading Option Bytes bank: 0 failed
Error: Initializing the Option Bytes failed
- ./STM32_Programmer_CLI.exe -c port=swd mode=HOTPLUG -w32 0x50022040 0x8BEFF0AA
Downloading...
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ 0%
Error: Failed to download data! If it's a Flash memory, it may be not erased or protected
- ./STM32_Programmer_CLI.exe -c port=swd mode=HOTPLUG -r32 0x50022040 0x04
- Error: failed to read the requested memory content
The board is an B-U585I-IOT02A and I have boot_lock on, so some ways using Boot0 are probably blocked. TZEN is set and no password were set up for RDP1 or RDP2 downgrade.
Any pointers what to try next are appreciated.
