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Rooting on non-boot device GPT partition

On older Pi systems, rooting on any other device & partition was as simple as editing cmdline.txt and setting root= to whatever we wanted, be it sd0a, dk0, whatever.

I see the default entry there now refers to the GPT partition on the image (netbsd-root), but changing that doesn't do anything.

Also, we can't compile a kernel with NAME or with dk0.

I COULD make a hybrid MBR / GPT with root on the MBR which is in the first two terabytes of the disk, but that seems kludgy.

What's the proper way these days to root off of a GPT partition on a USB adapter on a Pi 4? Or any other system?


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