What does "No firmware reserved region can cover this RMRR" warning mean?
Issue
-
The following warning is seen in the kernel log:
DMAR: RMRR base: 0x0000006f55f000 end: 0x0000006f561fff DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x000000006f55f000-0x000000006f561fff], contact BIOS vendor for fixes DMAR: [Firmware Bug]: Your BIOS is broken; bad RMRR [0x000000006f55f000-0x000000006f561fff] BIOS vendor: Dell Inc.; Ver: 2.9.3
Environment
- Red Hat Enterprise Linux 8.3 and above
- Red Hat Enterprise Linux 9 and above
- Intel Skylake and Cascade Lake CPUs and Coffee Lake
- Intel Atom® Processor C3708(Products formerly Denverton)
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