Personally I would expect the fallback to be reboot as without the
ability to power back on remotely e.g. IPMI this could render the
machine inaccessible, which is not ideal, thoughts?
On 25/10/2017 16:30, Warner Losh wrote:
Author: imp
Date: Wed Oct 25 15:30:20 2017
New Revision: 324983
URL: https://svnweb.freebsd.org/changeset/base/324983
Log:
Define RB_POWERCYCLE
RB_POWERCYCLE instructs the platform to power off and then power back
on a short time later, if that's possible. Otherwise, degrade to the
RB_POWEROFF behavior.
Sponsored by: Netflix
Modified:
head/lib/libc/sys/reboot.2
head/sys/sys/reboot.h
Modified: head/lib/libc/sys/reboot.2
==============================================================================
--- head/lib/libc/sys/reboot.2 Wed Oct 25 15:28:05 2017 (r324982)
+++ head/lib/libc/sys/reboot.2 Wed Oct 25 15:30:20 2017 (r324983)
@@ -28,7 +28,7 @@
.\" @(#)reboot.2 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
-.Dd September 18, 2015
+.Dd October 24, 2017
.Dt REBOOT 2
.Os
.Sh NAME
@@ -84,6 +84,14 @@ for more information.
.It Dv RB_HALT
The processor is simply halted; no reboot takes place.
This option should be used with caution.
+.It Dv RB_POWERCYCLE
+After halting, the shutdown code will do what it can to turn
+off the power and then turn the power back on.
+This requires hardware support, usually an auxiliary microprocessor
+that can sequence the power supply.
+At present only the
+.Xr ipmi 4
+driver implements this feature.
.It Dv RB_POWEROFF
After halting, the shutdown code will do what it can to turn
off the power.
Modified: head/sys/sys/reboot.h
==============================================================================
--- head/sys/sys/reboot.h Wed Oct 25 15:28:05 2017 (r324982)
+++ head/sys/sys/reboot.h Wed Oct 25 15:30:20 2017 (r324983)
@@ -60,6 +60,7 @@
#define RB_RESERVED2 0x80000 /* reserved for internal use of boot
blocks */
#define RB_PAUSE 0x100000 /* pause after each output line during
probe */
#define RB_REROOT 0x200000 /* unmount the rootfs and mount it
again */
+#define RB_POWERCYCLE 0x400000 /* Power cycle if possible */
#define RB_MULTIPLE 0x20000000 /* use multiple consoles */
#define RB_BOOTINFO 0x80000000 /* have `struct bootinfo *' arg */
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