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Extend the geom-related info and put in the NOTE section, not

Browse source 
in BUGS, as this is a feature.

Bump the date, as it was forgotten in previous commits and the
page has had significant changes recently
This commit is contained in:
Luigi Rizzo 2009-01-13 21:55:39 +00:00
parent 2568138fcd
commit 789a82a6db
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=187195
1 changed files with 19 additions and 14 deletions
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33
usr.sbin/boot0cfg/boot0cfg.8
View file

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd June 7, 2007
.Dd January 13, 2009
.Dt BOOT0CFG 8
.Os
.Sh NAME
@ -153,6 +153,21 @@ Set the timeout value to
.It Fl v
Verbose: display information about the slices defined, etc.
.El
.Sh NOTE
Protection mechanisms in the
.Xr geom 4
subsystem might prevent
.Nm
from being able to update the MBR on a mounted disk.
Instructions for temporarily disabling these protection mechanisms
can be found in the
.Xr geom 4
manpage. Specifically, do a
.Pp
.Dl sysctl kern.geom.debugflags=0x10
.Pp
to allow writing to the MBR, and restore it to 0 afterwards.
.Pp
.Sh FILES
.Bl -tag -width /boot/boot0sio -compact
.It Pa /boot/boot0
@ -186,16 +201,6 @@ to install the default MBR:
.Sh AUTHORS
.An Robert Nordier Aq rnordier@FreeBSD.org .
.Sh BUGS
Protection mechanisms in the
.Xr geom 4
subsystem might prevent
.Nm
from being able to update the MBR on a mounted disk.
Instructions for temporarily disabling these protection mechanisms
can be found in the
.Xr geom 4
manpage.
.Pp
Use of the
.Sq packet
option may cause
@ -204,6 +209,6 @@ to fail, depending on the nature of BIOS support.
.Pp
Use of the
.Sq setdrv
option with an incorrect -d operand may cause the MBR to be written
to the wrong disk.
Be careful!
option with an incorrect -d operand may cause the boot0 code
to write the MBR to the wrong disk, thus trashing its previous
content. Be careful.