ECC RAM

[skodde]

Does anyone use an ECC RAM module and they actually see it active as such on Linux (i.e. via dmesg, edac-util, dmidecode, etc.)?

I just installed a CT16G4WFD8266 module and it’s not recognized as ECC (dmidecode shows 64 bits of total width instead of the expected 72). Also, no EDAC memory controller is found on the system.

Kernel version is 4.20.12 with the following options enabled:

CONFIG_EDAC_SUPPORT=y
CONFIG_EDAC=y
CONFIG_EDAC_LEGACY_SYSFS=y
CONFIG_EDAC_DEBUG=y
CONFIG_EDAC_GHES=y
CONFIG_EDAC_THUNDERX=y
CONFIG_EDAC_XGENE=y

Firmware is EDK II compiled using:

atf-v1.5-armada-18.09
binaries-marvell-armada-18.06
uefi-2.7-armada-18.09
mv_ddr-armada-18.12

Is this expected or ECC RAM is indeed not (yet?) supported?

[nanasi]

Hi.
If ECC is initialized correctly, the next message will appear.

mv_ddr: scrubbing memory...
mv_ddr: completed successfully

There is no easy way to check whether ECC is working.
Since there is no open source memory controller driver for A8k/A7k.(AFAIK)

In addition, the memory width is hardcoded into UEFI source.
From dmidecode manpage:

BUGS
       More often than not, information contained in the DMI tables is inaccurate, incomplete or simply wrong.

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