introduce /etc/bsd.re-config which can be used to configure the kernel

using config(8);

the contents of this configuration file will be fed to config(8) after
kernel relinking is done, so on the next boot the new kernel will have
all the configuration changes set by the user

this comes handy if you still want to use KARL while making changes
to the GENERIC kernel

diff from Paul de Weerd with input from several developers

1 files changed, 9 insertions, 2 deletions

diff --git a/share/man/man8/boot_config.8 b/share/man/man8/boot_config.8
index 3e5d606e573..7816fd38cf0 100644
--- a/share/man/man8/boot_config.8
+++ b/share/man/man8/boot_config.8
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: boot_config.8,v 1.31 2019/09/06 21:30:32 cheloha Exp $
+.\"	$OpenBSD: boot_config.8,v 1.32 2021/09/13 11:49:21 robert Exp $
 .\"
 .\" Copyright (c) 1996 Mats O Jansson
 .\" All rights reserved.
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: September 6 2019 $
+.Dd $Mdocdate: September 13 2021 $
 .Dt BOOT_CONFIG 8
 .Os
 .Sh NAME
@@ -60,6 +60,12 @@ UKC>
 .Pp
 Changes made can be saved for the next reboot, by using
 .Xr config 8 .
+However, those would not be persisted across system upgrades and would
+prevent kernel relinking.
+To ensure these changes are carried over to upgraded kernels, they can
+be save to the
+.Xr bsd.re-config 5
+configuration file.
 .Sh COMMANDS
 .Bl -tag -width "disable devno | dev"
 .It Ic add Ar dev
@@ -189,6 +195,7 @@ Continuing...
 mainbus0 (root)
 .Ed
 .Sh SEE ALSO
+.Xr bsd.re-config 5
 .Xr config 8
 .Sh AUTHORS
 .An Mats O Jansson Aq Mt moj@stacken.kth.se