Hi all:  I noticed that ND_MIN_NAMESPACE_SIZE is defined as 4MB. nvdimm_namespace_common_probe(..){..    if (size < ND_MIN_NAMESPACE_SIZE) {  dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",  &size, ND_MIN_NAMESPACE_SIZE);  return ERR_PTR(-ENODEV);  }...} In our configuration, we have a host based software enumerated PMEM device that could be much smaller than 4MB.Because of above failure, no PMEM device was exposed. Is there any reason that it cannot be smaller? ThanksCheng-mean