Date: Tue, 28 Aug 2018 17:14:47 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r338354 - head/stand/defaults Message-ID: <201808281714.w7SHElsf067743@repo.freebsd.org>
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Author: markj Date: Tue Aug 28 17:14:46 2018 New Revision: 338354 URL: https://svnweb.freebsd.org/changeset/base/338354 Log: 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 Modified: head/stand/defaults/loader.conf.5 Modified: head/stand/defaults/loader.conf.5 ============================================================================== --- head/stand/defaults/loader.conf.5 Tue Aug 28 17:12:37 2018 (r338353) +++ head/stand/defaults/loader.conf.5 Tue Aug 28 17:14:46 2018 (r338354) @@ -23,7 +23,7 @@ .\" SUCH DAMAGE. .\" .\" $FreeBSD$ -.Dd March 23, 2018 +.Dd August 28, 2018 .Dt LOADER.CONF 5 .Os .Sh NAME @@ -289,6 +289,29 @@ See the entropy entries in .Pq Dq /boot/entropy The name of the very early boot-time entropy cache file. +.It Va cpu_microcode_load +.Pq Dq NO +If set to +.Dq YES , +the microcode update file specified by +.Va cpu_microcode_name +will be loaded and applied very early during boot. +This provides functionality similar to +.Xr cpucontrol 8 +but ensures that CPU features enabled by microcode updates can be +used by the kernel. +The update will be re-applied automatically when resuming from an +ACPI sleep state. +If the update file contains updates for multiple processor models, +the kernel will search for and extract a matching update. +Currently this setting is supported only on Intel +.Dv i386 +and +.Dv amd64 +processors. +It has no effect on other processor types. +.It Va cpu_microcode_name +A path to a microcode update file. .El .Sh OTHER SETTINGS Other settings that may be used in @@ -319,6 +342,7 @@ machine-specific settings for sites with a common load .Sh SEE ALSO .Xr rc.conf 5 , .Xr boot 8 , +.Xr cpucontrol 8 , .Xr loader 8 , .Xr loader.4th 8 .Sh HISTORY
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