I do not have Windows, but if only to confirm ECC can work on my hardware, I figured I can probably run that wmic memphysical get memoryerrorcorrection command from the Windows installation ISO, without installing the OS. When the installer starts, select “Repair Windows”, open a command prompt, and, indeed, the wmic command prints 6, meaning Multi-bit ECC is working

The instructions below for Debian 12 (bookworm) are minimally intrusive. They install only one modified kernel module (amd64_edac.ko) while keeping the kernel image and other modules unmodified.

First, install dependencies to compile the kernel module:

$ apt install build-essential bc kmod cpio bison flex gnupg wget linux-headers-amd64 libncurses-dev libelf-dev libssl-dev rsync dwarves

Get the kernel source and extract it:

$ apt install linux-source
$ cd /usr/src/
$ tar xf linux-source-5.15.tar.xz
$ cd linux-source-5.15

Obtain the configuration of the running kernel, disable signing of the modules (or else compilation would fail as we do not possess Debian’s signing key):

$ cp /usr/src/linux-headers-$(uname -r)/.config .
$ sed -r -i -e 's,^CONFIG_SYSTEM_TRUSTED_KEYS=.+,CONFIG_SYSTEM_TRUSTED_KEYS="",g' .config

Download my patch ecc-amd-cezanne.patch and apply it:

$ curl https://blog.zorinaq.com/assets/ecc-amd-cezanne.patch | patch -Np0

Compile:

$ make -j $(nproc) bindeb-pkg

Strip the .BTF section from the module amd64_edac.ko, or else attempting to load it will fail with the error failed to validate module [amd64_edac] BTF: -22 in dmesg. This seems to be a subtle bug due to a corner case in the BTF validation framework:

$ objcopy --remove-section .BTF debian/linux-image/lib/modules/*/kernel/drivers/edac/amd64_edac.ko

Install the module amd64_edac.ko in the updates directory which is given higher priority by depmod (so our patched module will load instead of the original module):

$ DEST="/lib/modules/$(uname -r)/updates"
$ mkdir -p "$DEST"
$ cp debian/linux-image/lib/modules/*/kernel/drivers/edac/amd64_edac.ko "$DEST"
$ depmod -a

Try loading the module. If it works, edac-util -v should show ECC statistics:

$ modprobe amd64_edac
$ edac-util -v
mc0: 0 Uncorrected Errors with no DIMM info
mc0: 0 Corrected Errors with no DIMM info
mc0: csrow0: 0 Uncorrected Errors
mc0: csrow0: mc#0csrow#0channel#0: 0 Corrected Errors
mc0: csrow0: mc#0csrow#0channel#1: 0 Corrected Errors
mc0: csrow1: 0 Uncorrected Errors
mc0: csrow1: mc#0csrow#1channel#0: 0 Corrected Errors
mc0: csrow1: mc#0csrow#1channel#1: 0 Corrected Errors
mc0: csrow2: 0 Uncorrected Errors
mc0: csrow2: mc#0csrow#2channel#0: 0 Corrected Errors
mc0: csrow2: mc#0csrow#2channel#1: 0 Corrected Errors
mc0: csrow3: 0 Uncorrected Errors
mc0: csrow3: mc#0csrow#3channel#0: 0 Corrected Errors
mc0: csrow3: mc#0csrow#3channel#1: 0 Corrected Errors
edac-util: No errors to report.