How to enable ECC with AsRock X470D4U and Ryzen 7

[Axel Rau]

Hi all,

both, the mainboard (with recent firmware P3.10) and Ryzen 7 CPU
should work with ECC RAM (while not officially supported).
RAM is KSM26ED8/16ME DDR4-2666 ECC DIMM.

AFAIdmesg and dmidecode do not indicate ECC (see below), I think.
Data path should show additional ECC bits.

There is only one related BIOS setting, I’m aware of.
Changing this from AUTO to ENABLED makes no difference.

Quick answer would be very helpfull.

Thanks Axel
PS: parts from dmesg and demidecode:

---<<BOOT>>---
Copyright (c) 1992-2019 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
	The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 12.1-RC1 r353428 GENERIC amd64
FreeBSD clang version 8.0.1 (tags/RELEASE_801/final 366581) (based on LLVM 8.0.1)
VT(efifb): resolution 800x600
CPU: AMD Ryzen 7 3700X 8-Core Processor              (3593.32-MHz K8-class CPU)
  Origin="AuthenticAMD"  Id=0x870f10  Family=0x17  Model=0x71  Stepping=0
  Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
  Features2=0x7ed8320b<SSE3,PCLMULQDQ,MON,SSSE3,FMA,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
  AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
  AMD Features2=0x75c237ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,SKINIT,WDT,TCE,Topology,PCXC,PNXC,DBE,PL2I,MWAITX,<b30>>
  Structured Extended Features=0x219c91a9<FSGSBASE,BMI1,AVX2,SMEP,BMI2,PQM,PQE,RDSEED,ADX,SMAP,CLFLUSHOPT,CLWB,SHA>
  Structured Extended Features2=0x400004<UMIP,RDPID>
  XSAVE Features=0xf<XSAVEOPT,XSAVEC,XINUSE,XSAVES>
  AMD Extended Feature Extensions ID EBX=0x10eb757<CLZERO,IRPerf,XSaveErPtr>
  SVM: NP,NRIP,VClean,AFlush,DAssist,NAsids=32768
  TSC: P-state invariant, performance statistics
real memory  = 68719476736 (65536 MB)
avail memory = 66818646016 (63723 MB)

. . .

root at b5:~ # dmidecode  -t memory
# dmidecode 3.2
# SMBIOS entry point at 0xed2b3000
Found SMBIOS entry point in EFI, reading table from /dev/mem.
SMBIOS 3.2 present.

Handle 0x000F, DMI type 16, 23 bytes
Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: Multi-bit ECC
	Maximum Capacity: 128 GB
	Error Information Handle: 0x000E
	Number Of Devices: 4

Handle 0x0017, DMI type 17, 84 bytes
Memory Device
	Array Handle: 0x000F
	Error Information Handle: 0x0016
	Total Width: 128 bits
	Data Width: 64 bits
	Size: 16384 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM 0
	Bank Locator: P0 CHANNEL A
	Type: DDR4
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 2666 MT/s
	Manufacturer: Kingston
	Serial Number: E72F267D
	Asset Tag: Not Specified
	Part Number: 9965745-002.A00G
	Rank: 2
	Configured Memory Speed: 2400 MT/s
	Minimum Voltage: 1.2 V
	Maximum Voltage: 1.2 V
	Configured Voltage: 1.2 V
	Memory Technology: DRAM
	Memory Operating Mode Capability: Volatile memory
	Firmware Version: Unknown
	Module Manufacturer ID: Bank 2, Hex 0x98
	Module Product ID: Unknown
	Memory Subsystem Controller Manufacturer ID: Unknown
	Memory Subsystem Controller Product ID: Unknown
	Non-Volatile Size: None
	Volatile Size: 16 kB
	Cache Size: None
	Logical Size: None

. . .
---
PGP-Key: CDE74120  ☀  computing @ chaos claudius

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