| Message ID | 54EB2124.7040701@plexistor.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Feb 23, 2015 at 4:46 AM, Boaz Harrosh <boaz@plexistor.com> 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. > I have no problem with this patch. > 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. s/comity/committee? > > I Wish and call the ACPI comity to Define that NvDIMM is type-12. > Also for DDR4 > > In this patch I name type-12 "unknown-12". This is because of > ACPI politics that refuse to reserve type-12 as DDR3-NvDIMM > and members keep saying: > "What if ACPI assigns type-12 for something else in future" > > [And I say: Then just don't. Please?] Good luck :) --Andy
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 18a9850..023dd29 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -25,6 +25,11 @@ #include <asm/proto.h> #include <asm/setup.h> +/* These are nonstandard Memory types that we do not want in the exported + * header. + */ +#define E820_UNKNOWN_12 12 /* This is the unofficial DDR3-NVDIMM */ + /* * The e820 map is the map that gets modified e.g. with command line parameters * and that is also registered with modifications in the kernel resource tree @@ -169,6 +174,9 @@ static void __init e820_print_type(u32 type) case E820_UNUSABLE: printk(KERN_CONT "unusable"); break; + case E820_UNKNOWN_12: + printk(KERN_CONT "unknown-12"); + break; default: printk(KERN_CONT "type %u", type); break; @@ -928,6 +936,7 @@ static inline const char *e820_type_to_string(int e820_type) case E820_NVS: return "ACPI Non-volatile Storage"; case E820_UNUSABLE: return "Unusable memory"; case E820_RESERVED: return "reserved"; + case E820_UNKNOWN_12: return "unkown-12"; default: return "reserved-unkown"; } }
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 name type-12 "unknown-12". This is because of ACPI politics that refuse to reserve type-12 as DDR3-NvDIMM and members keep saying: "What if ACPI assigns type-12 for something else in future" [And I say: Then just don't. Please?] Signed-off-by: Boaz Harrosh <boaz@plexistor.com> --- arch/x86/kernel/e820.c | 9 +++++++++ 1 file changed, 9 insertions(+)