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Subject[RFC 2/2] e820: Add the NvDIMM Memory type (type-12)

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 vendors I know of, tagged these chips as type-12 memory.

[THIS IS A CALL FOR ALL NvDIMM Vendors if you have used other
then type-12 NvDIMM, please email me and I will add support
for it]

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 be defined for DDR4. So DDR3 NvDIMM will continue
to be supported by the individual vendors.

I Wish and call the ACPI comity to Define that NvDIMM is type-12.
Also for DDR4

In this patch I name type-12 "NvDIMM-12", but if there
are positive responses I would like to just name it "NvDIMM",
For any kind of DDR-X.

Actually is there any reason why I should not submit the final
version as "NvDIMM" from the get go. Then if the ACPI defines
another new type-Y Memory we can name both types "NvDIMM", No?
Please comment

Signed-off-by: Boaz Harrosh <>
arch/x86/include/uapi/asm/e820.h | 2 +-
arch/x86/kernel/e820.c | 5 +++++
2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/uapi/asm/e820.h b/arch/x86/include/uapi/asm/e820.h
index d993e33..a0977e0 100644
--- a/arch/x86/include/uapi/asm/e820.h
+++ b/arch/x86/include/uapi/asm/e820.h
@@ -32,7 +32,7 @@
#define E820_ACPI 3
#define E820_NVS 4
#define E820_UNUSABLE 5
+#define E820_NvDIMM_12 12

* reserved RAM used by kernel itself
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 8cfd25f..17f7496 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -149,6 +149,9 @@ static void __init e820_print_type(u32 type)
case E820_UNUSABLE:
printk(KERN_CONT "unusable");
+ case E820_NvDIMM_12:
+ printk(KERN_CONT "NvDIMM-12");
+ break;
printk(KERN_CONT "type %u", type);
@@ -908,6 +911,7 @@ 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_NvDIMM_12: return "NvDIMM-12";
default: return "reserved-unkown";
@@ -922,6 +926,7 @@ static bool _is_reserved_type(int e820_type)
case E820_UNUSABLE:
return false;
case E820_RESERVED:
+ case E820_NvDIMM_12:
return true;

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