Unable to flash firmware(Using VsCode) due to APProtect (NRF9151)

RE: Unable to flash firmware(Using VsCode) due to APProtect (NRF9151)

dejans — Wed, 02 Oct 2024 12:51:21 GMT

Hi Ethan,

Thank you for the update.

Best regards,
Dejan

RE: Unable to flash firmware(Using VsCode) due to APProtect (NRF9151)

EthanKeet — Wed, 02 Oct 2024 07:06:01 GMT

Hi Dejans,

Sorry for the delay. I have replaced the NRF9151 on my board and all is working as it should be. I assume that I accidently bricked the MCU on the previous chip. You can go ahead and close this thread. Thanks for all your time and help.

Best regards,

Ethan

RE: Unable to flash firmware(Using VsCode) due to APProtect (NRF9151)

dejans — Wed, 25 Sep 2024 14:08:34 GMT

Hi,

Does this problem appear only on one of your custom boards? Have you tried any other of your boards?

Best regards,
Dejan

RE: Unable to flash firmware(Using VsCode) due to APProtect (NRF9151)

EthanKeet — Wed, 25 Sep 2024 05:54:42 GMT

Hi,

It is a custom board. Unfortunately, I can't share the specific board due it being proprietary. If board information is necessary I can open a private ticket?

Flashing firmware worked initially, I was flashing bootloader firmware and test firmware with no issues. After re - flashing a few times I wasn't able to flash firmware anymore because of the issues stated in the post.

In the bootloader, the following values were written to the hardware registers:

volatile UINT32* pSecureApProtectDisable = (volatile UINT32 * ) 0x50039E00;
    volatile UINT32* pNonSecureApProtectDisable = (volatile UINT32 * ) 0x50039E10;
    *pSecureApProtectDisable = 0x5A;
    *pNonSecureApProtectDisable = 0x5A;

I saw in the datasheet for the NRF9151, that writing to those two register entries is necessary to disable the APProtection on the NRF.

I was not able to write to those registers using JLink commander afterwards as I was unable to connect to the device.

I suspect that it could be a hardware issue. I might have damaged the NRF during testing. It just seems odd that the debug output I am getting from the device mentions ap protection being the cause of not being able to perform a nrfjprog --recover or nrfjprog --eraseall.

RE: Unable to flash firmware(Using VsCode) due to APProtect (NRF9151)

dejans — Mon, 23 Sep 2024 15:59:46 GMT

Hi,

Which board do you use?

Did flashing work fine prior to flashing bootloader firmware to your device?

[quote user=""]I've also tried to use JLink commander to manually write to the hardware registers but I can't connect to the device because the DAP won't power up.[/quote]

Which hardware registers did you try to write to and which values?

Best regards,
Dejan