Fedora 21 Workstation 64-bit with Linux test27.engr.enmotus.com 3.19.0-rc3+ #1 SMP Wed Feb 4 10:08:29 PST 2015 x86_64 x86_64 x86_64 GNU/Linux [ 0.000000] Linux version 3.19.0-rc3+ (rcpao(a)test27.engr.enmotus.com) (gcc version 4.9.2 20141101 (Red Hat 4.9.2-1) (GCC) ) #1 SMP Wed Feb 4 10:08:29 PST 2015 [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.19.0-rc3+ root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/swap rd.lvm.lv=fedora/root rhgb quiet LANG=en_US.UTF-8 [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009abff] usable [ 0.000000] BIOS-e820: [mem 0x000000000009ac00-0x000000000009ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000733fcfff] usable [ 0.000000] BIOS-e820: [mem 0x00000000733fd000-0x000000007dc53fff] reserved [ 0.000000] BIOS-e820: [mem 0x000000007dc54000-0x000000007df4dfff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x000000007df4e000-0x000000007e6edfff] reserved [ 0.000000] BIOS-e820: [mem 0x000000007e6ee000-0x000000007e71dfff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x000000007e71e000-0x000000007f35bfff] reserved [ 0.000000] BIOS-e820: [mem 0x000000007f35c000-0x000000007f7fffff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x0000000080000000-0x000000008fffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed3ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000180000000-0x000000047fffffff] usable [ 0.000000] BIOS-e820: [mem 0x0000000480000000-0x000000057fffffff] type 12 [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] SMBIOS 2.7 present. [ 0.000000] DMI: Supermicro X9DRH-iF-NV/X9DRH-iF-NV, BIOS 3.1 06/27/2014 $ sudo modprobe pmem map=4G@18G modprobe: ERROR: could not insert 'pmem': Invalid argument 1. I am trying to load pmem over a 4GB NVDIMM after 2*8GB RDIMMs. I initially tried map=4G@16G, but then tried map=4G@18G due to the BIOS-e820 type 12 entry. Either argument results in "Invalid argument'. What am I doing wrong? 2. Will PMEM be modified to scan for NVDIMMs in the future or is this manual map= method final?