Document softraid boot process for i386/amd64.

Requested by Adam Thompson.
suggestions and ok deraadt, earlier version ok jmc

1 files changed, 14 insertions, 2 deletions

diff --git a/sys/arch/i386/stand/biosboot/biosboot.8 b/sys/arch/i386/stand/biosboot/biosboot.8
index 679b79bc35f..b154093d068 100644
--- a/sys/arch/i386/stand/biosboot/biosboot.8
+++ b/sys/arch/i386/stand/biosboot/biosboot.8
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: biosboot.8,v 1.24 2011/12/03 23:01:21 schwarze Exp $
+.\"	$OpenBSD: biosboot.8,v 1.25 2013/10/28 15:15:08 stsp Exp $
 .\"
 .\" Copyright (c) 2003 Tom Cosgrove <tom.cosgrove@arches-consulting.com>
 .\" Copyright (c) 1997 Michael Shalayeff
@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: December 3 2011 $
+.Dd $Mdocdate: October 28 2013 $
 .Dt BIOSBOOT 8 i386
 .Os
 .Sh NAME
@@ -54,6 +54,17 @@ inode,
 the offset within this block of the inode,
 and various filesystem parameters (taken from the superblock)
 required to convert filesystem blocks to disk sectors.
+Usually,
+.Xr boot 8
+is loaded from the root filesystem of the boot disk.
+If the boot disk is a
+.Xr softraid 4
+volume,
+.Xr installboot 8
+arranges for a copy of
+.Xr boot 8
+to be loaded from a dedicated single-inode filesystem located within
+the volume's meta data area.
 .Pp
 You must re-run
 .Xr installboot 8
@@ -252,6 +263,7 @@ kernel for multiprocessor machines
 kernel for installation/recovery
 .El
 .Sh SEE ALSO
+.Xr softraid 4 ,
 .Xr boot 8 ,
 .Xr boot_i386 8 ,
 .Xr disklabel 8 ,