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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: mbr.8,v 1.4 2007/05/31 19:20:03 jmc Exp $
.\"
.\" Copyright (c) 2006 Michael Shalayeff
.\" All rights reserved.
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
.\" AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
.\" OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: March 4 2008 $
.Dt MBR 8 landisk
.Os
.Sh NAME
.Nm mbr
.Nd
LANDISK-specific Master Boot Record
.Sh SYNOPSIS
.Nm
.Sh DESCRIPTION
The
.Nm MBR
program comprises only one sector (512 bytes) and includes
a partition table, since the disk is located in the 0th sector of the disk.
Upon receiving control from the system firmware
.Nm
will scan the partition table for an active partition and continue
loading the Primary Boot Record (PBR) from the beginning of the
partition, if found.
.Pp
.Nm
is installed on the disk by
.Xr fdisk 8 ,
which is also used to operate the partition table.
.Pp
The partition table consists of four entries, only one of which may be
marked as
.Dq active .
The PBR is loaded from there.
.Sh DIAGNOSTICS
A few messages are printed in case of errors:
.Bl -tag -width "no_active_partitionXX"
.It "No active partition"
Indicates that none of the partitions are marked
.Dq active .
.It Read error
An error occurred while fetching the primary boot loader.
.It "No O/S"
The partition table is empty.
.El
.Sh SEE ALSO
.Xr boot 8 ,
.Xr boot_landisk 8 ,
.Xr bootxx 8 ,
.Xr disklabel 8 ,
.Xr fdisk 8