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0e1f616
(Get the code!)
I'm having a hard time in getting a VM up and running with the correct support for the ndctl commands, and I'm not sure what is going on. @paelzer also tried, and got the same error. Basically any enable-namespace or create-namespace command fails complaining about "no such device".
I also tried using just one emulated nvdimm device, given comment #11, but it still fails.
I tried both bionic (ndctl 61.2, also the one from Tinoco's ppa; kernel 4.15.0-76-generic #86), and focal-devel (ndctl 67.1, kernel 5.4.0-9-generic #12).
I can enable and disable dimms, regions, mess with labels, but namespaces can only be listed (disabled) and disabled (they are already disabled). I cannot enable or create them.