NUC6I5SYK shows error when booting linux:
kernel: DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x000000007b800000-0x000000007fffffff], contact BIOS vendor for fixes kernel: DMAR: [Firmware Bug]: Your BIOS is broken; bad RMRR [0x000000007b800000-0x000000007fffffff] BIOS vendor: Intel Corp.; Ver: SYSKLi35.86A.0072.2019.1001.1636; Product Version: H81131-505
'Your BIOS is broken' sounds alarming to me.
Is it a real threat or just some typically hysterical linux-journal babble?
Thank you in advance;
Thank you for posting on the Intel® communities.
I need to inform you that due to this product being discontinued, Intel Customer Service no longer supports inquiries for it, but perhaps fellow community members have the knowledge to jump in and help.
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Intel Technical Support Technician
What distro of Linux are you using and what kernel version? Does this error stop the Linux from working? Could this be a false positive error? Are you overclocking your memory beyond 2133MHz?
These questions need to be answered since your post does not provide enough information.
Saw this on an Arch Linux forum post that might answer your question:
Hello @MRoss5200 and thank you for your reply.
I'am using Archlinux, mainline kernel 5.8.13-arch1-1.
Memory (Crucial DDR4 2133) is not overclocked. All stock settings in BIOS.
The "error" appeared with one of the latest kernel (5.X) updates but I did not notice any impacts beside the alarming red "Your BIOS is broken!" entry in logs.
I found the thread in the archlinux forum too but everything there is speculation only.
hi @GerKel1 - I just posted the following security related post. Hoping intel come back to us with commitment on fixing the cpu microcode issue and you DMAR issue. Both security related. I’m sure an easy fix for Intel.
both within the security fix timeline.
the NUC product line is such a great solution.