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NVDIMM(4)		 amd64 Kernel Interfaces Manual 	       NVDIMM(4)

NAME
     nvdimm -- ACPI NVDIMM driver

SYNOPSIS
     To load the driver as a module at boot, place the following line in
     loader.conf(5):

	   nvdimm_load="YES"

DESCRIPTION
     Note: The nvdimm driver is under development and has some important limita-
     tions described below.

     The  nvdimm driver provides access to Non-Volatile DIMM (NVDIMM) persistent
     memory devices, which are ACPI-enumerated under the root NVDIMM device with
     a _HID of ACPI0012 and in the NFIT table.

     For each System Physical Address (SPA) Range described by	NFIT,  a  device
     node  /dev/nvdimm_spaNNN  is  created, where NNN is the SPA position in the
     table.  The node can be used to read(2), write(2), or mmap(2) the device.

     Also, for each SPA, the geom provider spaNNN is created, which can be  used
     to  create a conventional filesystem (e.g., by newfs(8)) and mount(8) it as
     any  storage  volume.   Content  accessible   by	/dev/nvdimm_spaNNN   and
     /dev/spaNNN is coherent.

     The  nvdimm  driver has support for reading NVDIMM namespaces (if supported
     by your hardware and already configured by some other  mechanism,	e.g.,  a
     BIOS    configuration    screen).	   The	  driver    will    provide    a
     /dev/nvdimm_spaNNNnsMMM device node and spaNNNnsMMM geom provider for  each
     namespace	in a SPA, which behave analogously to their full-SPA cousins de-
     scribed above.

SEE ALSO
     acpi(4), GEOM(4), geom(8), mount(8), newfs(8), disk(9)

HISTORY
     The nvdimm driver first appeared in FreeBSD 12.0.

AUTHORS
     The  nvdimm  driver  was  originally   written   by   Konstantin	Belousov
     <kib@FreeBSD.org>,    and	  then	  updated    by    D.	Scott	Phillips
     <scottph@FreeBSD.org>.

BUGS
     The nvdimm driver does not utilize the Block  Window  interface,  so  if  a
     write  to	an  NVDIMM is interrupted due to a system crash or power outage,
     the corresponding page might be left in a partially updated state.

     There is no support for Device-Specific Methods (DSM), used to  report  and
     control device health and wearing.

     The  driver  depends  on the pmap_largemap(9) pmap interface, which is cur-
     rently only implemented on amd64.	The interface can be only reasonable im-
     plemented on 64bit architectures.

FreeBSD ports 15.quarterly	September 5, 2019		       NVDIMM(4)

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