On Thu, Mar 5, 2015 at 2:24 AM, Boaz Harrosh <[email protected]> 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.
There's no relation between E820 types and DDR technology revisions. > I Wish and call the ACPI comity to Define that NvDIMM is type-12. > Also for DDR4 > > The motivation of this patch is to be able to differentiate > this NvDIMM type from a real future "unknown-reserved" type. > > In this patch I name type-12 "unknown-12". This is because of > ACPI politics that refuse to reserve type-12 as DDR3-NvDIMM It's not "politics". Setting standards takes time and the platforms in question simply jumped the gun to enable a proof-of-concept. > and members keep saying: > "What if ACPI assigns type-12 for something else in future" > > [And I say: Then just don't. Please?] Once a standard number is assigned, platform firmwares can update type-12 to that number. We might consider a compile time override for these niche/pre-standard systems that can't/won't update, but it's not clear to me that we even need to go that far. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
