procount

Have you read the Lineage FAQ? https://konstakang.com/devices/rpi4/LineageOS19/

I found this post -> https://www.riscosopen.org/wiki/documentation/show/Software%20information:%20RaspberryPi:%20RISC%20OS%20Pico%20RC5 which directed me to the downloads page -> https://www.riscosopen.org/content/downloads/raspberry-pi but I could not find the pico version there. But in any case, RiscOS uses...

Not really. PINN searches all devices in /sys/class/block that are not virtual devices by mounting them and trying to locate recovery.rfs. Does your drive show up in there?

Maybe it is missing a driver?

@XECDesign - Do I need any additional drivers for NVME drives in the CM4 PCIe slot?

Thanks @pelwell. I enabled CONFIG_NVMEM_RMEM after adding required CONFIG_PCI, but CONFIG_NVMEM_RMEM was not available. Guess I need a newer kernel for that. I'm using 5.4.51

3.7.1 is the latest. It has a later 5.10 kernel but I haven't enabled the additional CONFIG_NVMEM_RMEM config yet so it may still not work. I'll check if it is...

Yes it seems to be available now, so I'll push up a version for you to test if you wouldn't mind.

https://sourceforge.net/projects/pinn/files/testing/pinn-3753.zip/download

I have no idea if it will work.....