failure to setup devdax over fake nvdimm

Hello Dan, On a machine emulating nvdimms over DDR using the memmap kernel parameter, I can't enable devdax anymore with ndctl, when using your libnvdimm-pending branch (1ffc664f9b8ca7346f2af0fb4f62b923193bf65c): # ndctl create-namespace -f -e namespace1.0 -t pmem -m devdax libndctl: ndctl_dax_enable: dax1.0: failed to enable Error: namespace1.0: failed to enable failed to reconfigure namespace: No such device or address In the previous version of your libnvdimm-pending branch that I used before (8d4a7e3da68e88a6efd3acb5cc971d0c2ca219a4 from January 8th) this ndctl line worked fine right after boot. The difference between strace ndctl doesn't show anything obvious. * /sys/devices/platform/e820_pmem/ndbus0/region1/namespace1.0/holder_class contains nothing instead of "dax" * /sys/devices/platform/e820_pmem/ndbus0/region1/dax_seed contains dax1.0 instead of dax1.1 Any idea where to look? Thanks Brice