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SubjectAMD Ryzen: pci 0000:00:00.2: can't derive routing for PCI INT A
Date
Dear Linux folks,


On most (if not all) AMD Ryzen systems, including the Dell OptiPlex
5055, [1][2], Linux prints the warning below:

$ dmesg --level=warn
[ 0.871377] pci 0000:00:00.2: can't derive routing for PCI INT A
[ 0.871732] pci 0000:00:00.2: PCI INT A: not connected
[ 0.884890] PPR NX GT IA GA PC GA_vAPIC
$ more /proc/version
Linux version 5.4.39.mx64.334 (root@lol.molgen.mpg.de) (gcc version
7.5.0 (GCC)) #1 SMP Thu May 7 14:27:50 CEST 2020
pmenzel@donut:~$ dmesg | grep 'DMI:'
[ 0.000000] DMI: Dell Inc. OptiPlex 5055 Ryzen CPU/0P03DX, BIOS
1.1.20 05/31/2019

The system seems to work fine. What effect might be caused by the
missing routing information?

I assume this is a firmware issue? Can I patch the ACPI tables to
provide the correct information?

Should this indeed be an AMD AGESA issue, it be great, if somebody with
contacts at AMD could be forward this to the appropriate folks.


Kind regards,

Paul


[1]: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1804589
[2]: https://bugs.launchpad.net/dell-sputnik/+bug/1881121

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