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SubjectRe: [PATCH 00/21] ND: NFIT-Defined / NVDIMM Subsystem
On Fri, Apr 17, 2015 at 6:35 PM, Dan Williams <> wrote:
> Since 2010 Intel has included non-volatile memory support on a few
> storage-focused platforms with a feature named ADR (Asynchronous DRAM
> Refresh). These platforms were mostly targeted at custom applications
> and never enjoyed standard discovery mechanisms for platform firmware
> to advertise non-volatile memory capabilities. This now changes with
> the publication of version 6 of the ACPI specification [1] and its
> inclusion of a new table for describing platform memory capabilities.
> The NVDIMM Firmware Interface Table (NFIT), along with new EFI and E820
> memory types, enumerates persistent memory ranges, memory-mapped-I/O
> apertures, physical memory devices (DIMMs), and their associated
> properties.
> The ND-subsystem wraps a Linux device driver model around the objects
> and address boundaries defined in the specification and introduces 3 new
> drivers.
> nd_pmem: NFIT enabled version of the existing 'pmem' driver [2]
> nd_blk: mmio aperture method for accessing persistent storage
> nd_btt: give persistent memory disk semantics (atomic sector update)
> See the documentation in patch2 for more details, and there is
> supplemental documentation on [4]. Please review, and
> patches welcome...
> For kicking the tires, this release is accompanied by a userspace
> management library 'ndctl' that includes unit tests (make check) for all
> of the kernel ABIs. The nfit_test.ko module can be used to explore a
> sample NFIT topology.
> [1]:
> [2]:
> [3]:
> [4]:

nd.git and ndctl.git trees are now up to date. I'll aim to keep
nd.git non-rebasing, but what eventually goes upstream is likely to be
a re-flowed patch set. ndctl.git won't rebase.

nd.git: git:// nd

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