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README.md: Note importance of microcode updates

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@ -137,7 +137,9 @@ Networking:
Mitigations for known CPU vulnerabilities are enabled in their strictest form Mitigations for known CPU vulnerabilities are enabled in their strictest form
and simultaneous multithreading (SMT) is disabled. See the and simultaneous multithreading (SMT) is disabled. See the
`/etc/default/grub.d/40_cpu_mitigations.cfg` configuration file. `/etc/default/grub.d/40_cpu_mitigations.cfg` configuration file. Note, to achieve
complete protection for known CPU vulnerabilities, the latest security microcode
(BIOS/UEFI) updates must also be installed on the system.
Boot parameters relating to kernel hardening, DMA mitigations, and entropy Boot parameters relating to kernel hardening, DMA mitigations, and entropy
generation are outlined in the `/etc/default/grub.d/40_kernel_hardening.cfg` generation are outlined in the `/etc/default/grub.d/40_kernel_hardening.cfg`