What does "No firmware reserved region can cover this RMRR" warning mean?

Solution Verified - Updated -

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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