Re: [Linux-nvdimm] [PATCH 0/2] e820: Fix handling of NvDIMM chips

From: Boaz Harrosh
Date: Thu Feb 19 2015 - 04:25:56 EST

On 02/19/2015 02:47 AM, Christoph Hellwig wrote:
> On Wed, Feb 18, 2015 at 10:15:32AM -0800, Dan Williams wrote:
>> In fact it was originally "type-6" until ACPI 5 claimed that number
>> for official use, so these platforms, with early proof-of-concept
>> nvdimm support, have already gone through one transition to a new
>> number. They need to do the same once an official number for nvdimm
>> support is published.
>> Put another way, these early platforms are already using out-of-tree
>> patches for nvdimm enabling. They can continue to do so, or switch to
>> standard methods when the standard is published.
> Not supporting hardware that is widely avaiable (I have some, too)
> is not very user friendly.
> I'll submit a patch allowing a nvdimm_type= kernel option that allows
> to detect them, but will do nothing by default. The code needed is very
> small and it would be very useful for all kinds of projects.

I do not see why you need the nvdimm_type= kernel option at all.

I have here a script that auto detects any NvDIMM. It works with all
the chips that I have access to. And Also it has support for if you have
For all these detected regions it will load a pmem device.

It is easy to filter for any type of memory you want. What
will the (annoying) kernel option give you?

OK I might be jumping the guns, send the patch and I'll look
at it.


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