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Jlink is closed source.

Better use dirtyJTAG on an rp2040.

Good to see an "organic" J-Link + RISC-V use case :)
I bought a Pinecil so I could run it off a battery. I really came to appreciate the excellent temperature control and rapid heating, and use it instead of my soldering station for jobs away from the bench.

I have felt absolutely no need to touch the firmware. I try to forget that it is more powerful than my first three personal computers combined. Plug in, turn on, get hot. It meets my needs and exceeded my expectations. I suppose I could run a website from it if I wanted to make a point but as long as it doesn't require wifi and phone home to verify the license and leak my biometric data I expect to use it until I wear it out.

Do you run it at 20V or USB 5V? I ask because I found it heated up very slowly at 5V (and had trouble maintaining high heat), while once I got a nice USB PD power supply, it worked very well.

It replaced my weller almost instantly (the weller just inserts heat insert nuts now).

It's been a long time since I messed around with this stuff, proprietary JTAG devices and debuggers used to be leaps and bounds ahead of open source ones. Is it still the same?