Document the cpu_microcode_* tunables.
Reviewed by: bcr (previous version), kib Approved by: re (gjb) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D16923
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@ -23,7 +23,7 @@
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.Dd March 23, 2018
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.Dd August 28, 2018
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.Dt LOADER.CONF 5
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.Os
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.Sh NAME
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@ -289,6 +289,29 @@ See the entropy entries in
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.Pq Dq /boot/entropy
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The name of the very early
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boot-time entropy cache file.
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.It Va cpu_microcode_load
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.Pq Dq NO
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If set to
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.Dq YES ,
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the microcode update file specified by
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.Va cpu_microcode_name
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will be loaded and applied very early during boot.
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This provides functionality similar to
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.Xr cpucontrol 8
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but ensures that CPU features enabled by microcode updates can be
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used by the kernel.
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The update will be re-applied automatically when resuming from an
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ACPI sleep state.
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If the update file contains updates for multiple processor models,
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the kernel will search for and extract a matching update.
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Currently this setting is supported only on Intel
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.Dv i386
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and
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.Dv amd64
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processors.
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It has no effect on other processor types.
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.It Va cpu_microcode_name
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A path to a microcode update file.
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.El
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.Sh OTHER SETTINGS
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Other settings that may be used in
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@ -319,6 +342,7 @@ machine-specific settings for sites with a common loader.conf.
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.Sh SEE ALSO
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.Xr rc.conf 5 ,
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.Xr boot 8 ,
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.Xr cpucontrol 8 ,
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.Xr loader 8 ,
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.Xr loader.4th 8
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.Sh HISTORY
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