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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: installboot.8,v 1.9 2007/05/31 19:20:05 jmc Exp $
.\"	$NetBSD: installboot.8,v 1.1 1995/09/30 21:32:14 pk Exp $
.\"
.\" Copyright (c) 1995 Paul Kranenburg
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
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.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"      This product includes software developed by Paul Kranenburg.
.\" 3. The name of the author may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission
.\"
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.Dd $Mdocdate: March 4 2008 $
.Dt INSTALLBOOT 8 sparc
.Os
.Sh NAME
.Nm installboot
.Nd install a bootstrap on an FFS filesystem partition
.Sh SYNOPSIS
.Nm installboot
.Op Fl nvh
.Op Fl a Ar karch
.Ar boot
.Ar bootxx
.Ar device
.Sh DESCRIPTION
.Nm installboot
prepares an FFS filesystem partition for boot-strapping from the PROM.
The sparc bootblocks are split into two parts: a small first-stage program that
is written into the superblock area in a partition
.Po
and hence is limited in size to SBSIZE - DEV_BSIZE bytes
.Pc ,
and a second-stage program that resides in the filesystem proper.
The first-stage program is loaded into memory by the PROM.
After it receives control, it loads the second stage program from a set of
filesystem block numbers that have been hard-coded into it by the
.Nm installboot
program.
The second-stage boot program uses the device driver interface to
the PROM and the stand-alone filesystem code in
.Dq libsa.a
to locate and load the kernel.
The second-stage boot program and the prototype code for the
first-stage bootprogram can be found in
.Pa /usr/mdec/boot
and
.Pa /usr/mdec/bootxx
respectively.
The second-stage program commonly resides in the root directory as
.Pa /boot .
The utility
.Pa /usr/mdec/binstall
can be used to properly copy the second-stage bootprogram to its destination.
This script takes care of post-processing that is required on
.Pf non- Tn Openboot
machines.
.Pp
The options are as follows:
.Bl -tag -width flag
.It Fl a Ar karch
Set the machine architecture.
The argument
.Ar karch
can be one of
.Dq sun4 ,
.Dq sun4c
or
.Dq sun4m .
Sun 4c models with
.Tn Openboot
PROMs need the header to be present, while Sun 4 systems with the
.Dq old monitor
interface require the header to be stripped off.
This is normally taken care of by
.Nm installboot
automatically, but it's useful when preparing a bootable filesystem for
another system.
.It Fl h
Leave the
.Xr a.out 5
header on the installed
.Ar bootxx
program.
This option has been superseded by the
.Fl a Ar karch
option.
.It Fl n
Do not actually write anything on the disk.
.It Fl v
Verbose mode.
.El
.Pp
The arguments are:
.Bl -tag -width bootxx
.It Ar boot
the name of the second-stage boot program in the file system
where the first-stage boot program is to be installed.
.It Ar bootxx
the name of the prototype file for the first stage boot program.
.It Ar device
the name of the raw device in which the first-stage boot program
is to be installed.
This should correspond to the block device on which the file system containing
.Ar boot
is mounted.
.El
.Sh EXAMPLES
The following command will install the first-stage bootblocks in the
root filesystem
.Pq assumed to be mounted on Dq sd0a
using the file
.Pa /boot
as the second-level boot program:
.Bd -literal -offset indent
installboot /boot /usr/mdec/bootxx /dev/rsd0a
.Ed
.Sh SEE ALSO
.Xr disklabel 8 ,
.Xr init 8
.Sh HISTORY
The
.Nm installboot
first appeared in
.Nx 1.1 .
.Sh BUGS
.Nm installboot
requires simultaneous access to the mounted file system and
the raw device, but that is not allowed with the kernel
.Dv securelevel
variable set to a value greater than zero
.Pq the default ,
so
.Nm installboot
only works in single-user mode
.Pq or insecure mode - see Xr init 8 .