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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1869235
Title:
Ryzen 3rd gen (3900X) ECC support missing from kernel
Status in linux package in Ubuntu:
Incomplete
Bug description:
Ubuntu server:
Description: Ubuntu 19.10
Release: 19.10
Installed kernel:
linux-generic:
Installed: 5.3.0.42.36
(I could not figure out what package to select in the 'in what package did
you find this bug' chooser)
Expected behavior: ECC RAM is detected and utilized
Result instead:
Error in dmesg at boot:
EDAC amd64: Error: F0 not found, device 0x1460 (broken BIOS?) (more in the
attached KernelErrors.log)
Kernel 5.3 is missing ECC support for some families of AMD Ryzen 3rd
gen CPUs.
Support is added via these two commits in the mainline tree:
https://github.com/torvalds/linux/commit/e53a3b267fb0a79db9ca1f1e08b97889b22013e6
https://github.com/torvalds/linux/commit/3e443eb353eda6f4b4796e07f2599683fa752f1d
The second commit actually adds the missing support, but it relies on
the first commit: a partial refactor of the AMD ECC code.
I tested myself, followed the instructions at
https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel to build my own kernel,
cherry-picked the two above commits, and have working ECC support on my
self-built kernel:
Linux smaug 5.3.0-43-generic #36 SMP Sat Mar 21 02:33:30 UTC 2020 x86_64
x86_64 x86_64 GNU/Linux:
EDAC MC: Ver: 3.0.0
EDAC amd64: Node 0: DRAM ECC enabled.
EDAC amd64: F17h_M70h detected (node 0).
EDAC MC: UMC0 chip selects:
EDAC amd64: MC: 0: 0MB 1: 0MB
EDAC amd64: MC: 2: 16384MB 3: 16384MB
EDAC MC: UMC1 chip selects:
EDAC amd64: MC: 0: 0MB 1: 0MB
EDAC amd64: MC: 2: 16384MB 3: 16384MB
EDAC amd64: using x16 syndromes.
EDAC amd64: MCT channel count: 2
EDAC MC0: Giving out device to module amd64_edac controller F17h_M70h: DEV
0000:00:18.3 (INTERRUPT)
EDAC PCI0: Giving out device to module amd64_edac controller EDAC PCI
controller: DEV 0000:00:18.0 (POLLED)
AMD64 EDAC driver v3.5.0
If this could be included in a future hardware support kernel release, that
would be very helpful. I am unsure what the policy is for including this kind
of backport in non-LTS kernels, though I know the LTS releases have hardware
support updates that include this type of fix.
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