Programming external target using nRF54L15 DK

[Sai]

I am trying to external target using the nRF54L15DK and I get the following error.

Error: Failed with exit code 1. Failed to device info one or more devices: * 1057767167: [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1), code: Generic. Message: Operation device-info failed, [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1).

My external target is an Ezurio nRF54L15 module. I have connected the following pins using a standard 10 pin SWD connector .

• Reset
• VDD
• GND
• SWDIO
• SWDCLK
• Pin 3 is connected to ground. 

I have programmed VOUT 1 to 3.2V. My target voltage is 3.25 V

[Simonr]

That sounds very strange, can you show me an image of how you connect the board to the nRF54L15 DK on your end so I can double check it's all correctly connected. Based on your description it seems good.

Best regards,

Simon

[Sai]

Attached is my image of my programming setup. As I mentioned before, the same cable works on an nRF52840-DK board. 

[Simonr]

Okay, so the SWD cable length supported for flashing external boards is shorter than for previous DKs. This will make it into the DK user guide in the future. If you have an SWD cable shorter than 10cm I suggest giving that a try. The shorter the better really. Also note that the DKs VDD and the external VDD needs to be the same, and the target power jumper must be mounted.

Best regards,

Simon

[Sai]

Just to be clear:

• I need to use a shorter cable. 
• The VDD for the external target and the DK need to be the same. I am powering the external target using a 3.3V power supply. Is this enough? 
• Which jumper are you referring to? The instructions in the documentation didn't specifically mention any jumper unless I missed it.