nrfjprog "Cannot connect to J-Link" though libjlinkarm.so.6.88.1 found

RE: nrfjprog "Cannot connect to J-Link" though libjlinkarm.so.6.88.1 found

Håkon Alseth — Mon, 27 Sep 2021 07:22:37 GMT

Hi Ted,

Which physical debugger are you using?

Note that some older versions are unable to program Cortex M33 devices, as per segger's wiki page:

https://wiki.segger.com/Software_and_Hardware_Features_Overview

[quote user="tedhavelka"]What kind of warnings or errors would I be looking for there? Is it possible those errors would not name "JLink" itself, but refer only to the USB subsystem in more general or abstract ways?[/quote]

This was just a thought, but if do not see any highlights in red after plugging in the debugger, you should be fine.

Kind regards,

Håkon

RE: nrfjprog "Cannot connect to J-Link" though libjlinkarm.so.6.88.1 found

tedhavelka — Sat, 25 Sep 2021 08:16:26 GMT

Hi Håkon,

JLink's udev rules by that very filename are installed. I've rebooted a number of times since installing the driver, and on a Linux system like I am using I don't recall explicitly installing a JLink driver. I assumed any driver got installed as part of the larger nRF Connect toolchain and SDK installation.

I have not studied the full record of `dmesg`. What kind of warnings or errors would I be looking for there? Is it possible those errors would not name "JLink" itself, but refer only to the USB subsystem in more general or abstract ways?

- Ted

RE: nrfjprog "Cannot connect to J-Link" though libjlinkarm.so.6.88.1 found

Håkon Alseth — Fri, 24 Sep 2021 13:52:49 GMT

Hi,

Your user does not seem to have access to your device.

Are the udev rules present on your computer? It should be located in "/etc/udev/rules.d/99-jlink.rules".

Have you rebooted (or reloaded udev rules) after installing the JLink driver?

[quote user=""]As an anecdote, I am able to flash a Zephyr based application via `west flash` to a Nordic nRF9160DK development board. This board has a JLink programmer+debugger integrated within itself. West's flash runner has actually detected when I have both the Segger JLink connected to the host computer, and the nRF9160DK. In that set up `nrfjprog` prompts me for which programmer I wish to use to flash firmware.[/quote]

nrfjprog --ids shows the correct one as well? Nothing in "dmesg" that suggests there should be any problems with the usb device?

Kind regards,

Håkon