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Import of OpenBSD 4.2 release kernel tree with initial code to support 
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO

Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)

.\"	$OpenBSD: sgivol.8,v 1.5 2007/05/31 19:20:05 jmc Exp $
.\"
.\" Copyright (c) 2005 Theo de Raadt
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.Dd $Mdocdate: March 4 2008 $
.Dt SGIVOL 8 sgi
.Os
.Sh NAME
.Nm sgivol
.Nd installs a volume header on disk
.Sh SYNOPSIS
.Nm sgivol
.Op Fl fq
.Op Fl d Ar vhfilename
.Ar disk
.Nm sgivol
.Op Fl fiq
.Op Fl h Ar vhsize
.Ar disk
.Nm sgivol
.Op Fl fq
.Op Fl l Ar vhfilename1 Ar vhfilename2
.Ar disk
.Nm sgivol
.Op Fl fq
.Op Fl r Ar vhfilename Ar diskfilename
.Ar disk
.Nm sgivol
.Op Fl fq
.Op Fl w Ar vhfilename Ar diskfilename
.Ar disk
.Sh DESCRIPTION
.Nm
is used to initialize, and then add or remove programs from the
SGI disk volume header.
.Pp
The SGI volume header is a disklabel-like structure located at the
start of a disk.
It is typically 3135 (512-byte) blocks in size, and can store a
variety of files inside it, typically boot programs.
.Pp
The options are as follows:
.Bl -tag -width flag_opt
.It Fl d Ar vhfilename
Delete the file
.Ar vhfilename
from the filesystem storage space in the volume header.
.It Fl f
Force.
Do not ask yes/no questions.
.It Fl h Ar vhsize
Choose an alternate volume header size, in (512-byte) disk blocks.
The default is 3135 blocks.
.It Fl i
Initialize a volume header on the supplied device.
.It Fl l Ar vhfilename1 Ar vhfilename2
Link the file
.Ar vhfilename1
to the file
.Ar vhfilename2
within the filesystem storage space in the volume header.
.It Fl q
Be quiet about various diagnostic issues.
.It Fl r Ar vhfilename Ar diskfilename
Locate the file
.Ar diskfilename
in the storage space of the volume header, and copy it to the
standard file
.Ar vhfilename .
.It Fl w Ar vhfilename Ar diskfilename
Copy the standard file
.Ar vhfilename
to the filesystem storage space in the volume header, placing
it there with the name
.Ar diskfilename .
.It Ar disk
The name of the disk containing the partition in which the second-stage
boot program resides and the first-stage boot program is to be installed.
This can either be specified in short form (e.g.,
.Sq sd0
or as the explicit device node, such as
.Pa /dev/rsd0c ) .
.Pp
Note that you must be in single-user mode or have your kernel in
insecure mode (see the
.Xr sysctl 8
.Va kern.securelevel
variable or
.Pa /etc/rc.securelevel )
to enable access to the raw partition of a mounted disk.
.El
.Pp
If no special flags are supplied,
.Nm
will display the current volume header information.
.Sh EXAMPLES
The typical use is
.Bd -literal -offset indent
# /usr/mdec/sgivol -f -i sd0
# /usr/mdec/sgivol -f -w boot /usr/mdec/boot sd0
.Ed
.Sh SEE ALSO
.Xr disklabel 8 ,
.Xr init 8