Re: [PATCH 3B/3 fat] e820: dynamic unknown-xxx names (for DDR3-NvDIMM)

From: Andy Lutomirski
Date: Mon Feb 23 2015 - 10:50:04 EST

On Mon, Feb 23, 2015 at 4:48 AM, Boaz Harrosh <boaz@xxxxxxxxxxxxx> wrote:
> There are multiple vendors of DDR3 NvDIMMs out in the market today.
> At various stages of development/production. It is estimated that
> there are already more the 100ds of thousands chips sold to
> testers and sites.
> All the BIOS vendors I know of, tagged these chips at e820 table
> as type-12 memory.
> Now the ACPI comity, as far as I know, did not yet define a
> standard type for NvDIMM. Also, as far as I know any NvDIMM
> standard will only be defined for DDR4. So DDR3 NvDIMM is
> probably stuck with this none STD type.
> I Wish and call the ACPI comity to Define that NvDIMM is type-12.
> Also for DDR4
> In this patch I dynamically sprintf names into a static buffer
> (max two unknown names) of the form "unknown-XXX" where XXX
> is the type number. This is so we can return static string to
> caller.

I prefer the other variant.

For Pete's sake, people, defining new e820 types is ludicrous. It's
already sort of happened for nvdimms (and I really hope that type 12
is on its way out), and if it every happens again, we can deal with it

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