131 lines
5.0 KiB
Groff
131 lines
5.0 KiB
Groff
.\" $NetBSD: installboot.8,v 1.21 2008/04/30 13:10:57 martin Exp $
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.\"
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.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Paul Kranenburg.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd November 29, 1996
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.Dt INSTALLBOOT 8 amiga
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.Os
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.Sh NAME
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.Nm installboot
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.Nd install a bootstrap on an FFS filesystem partition
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.Sh SYNOPSIS
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.Nm /usr/mdec/installboot
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.Op Fl l Ar newcommandline
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.Ar bootblock
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.Ar device
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.Sh DESCRIPTION
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.Nm installboot
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copies the bootblock to a bootable partition. The
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bootstrap is written into the bootblock area on the partition, right
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in front of the superblock, and hence limited in size to
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8192 bytes.
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.Pp
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The bootstrap resides in the first few blocks on the partition
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.Pq as specified by Commodore-Amiga Inc.
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The bootstrap is loaded into memory by the ROM from bootable devices:
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RDB devices, where the partition is marked as bootable, or (not on the
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DraCo) floppy disks in Amiga format (880K/1760k).
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.Pp
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In the presence of more than one bootable partition/floppy disk, the partition
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is chosen by the bootpriority (from the RDB), which can be overridden by
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the operator from the boot menu (on Amiga machines, hold down the outer
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mouse buttons during boot; on DraCo machines, press the left mouse button
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when prompted).
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.Pp
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On RDB devices, the whole bootblock is loaded by the ROM. The number of
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boot blocks in the RDB partition entry must be correct.
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.Pp
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On floppy disks, the ROM always loads the first two blocks (1024 bytes),
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and the bootblock allocates memory and loads the whole bootblock on startup.
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.Pp
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After receiving control, the bootblock uses the stand-alone
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filesystem code in
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.Dq libsa.a
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to load the kernel from the filesystem on the partition it was started from.
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The code for the boot program can be found in
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.Pa /usr/mdec/bootxx_fd
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.Pq floppy disk code
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or
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.Pa /usr/mdec/bootxx_ffs
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.Pq generic RDB disk code .
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.Pp
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The arguments are:
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.Bl -tag -width bootblock
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.It Fl l Ar newcommandline
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Specify a different command line to replace the default.
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.It Ar bootblock
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The file containing the bootblock (normally /usr/mdec/bootxx_ffs for RDB devices).
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.It Ar device
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The name of the character special device specifying the partition on which the
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bootstrap is to be installed.
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.El
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.Sh EXAMPLES
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The following command will install the
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boot program in the bootblock area on
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.Dq sd0a :
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.Bd -literal -offset indent
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installboot /usr/mdec/bootxx_ffs /dev/rsd0a
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.Ed
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.Sh SEE ALSO
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.Xr dd 1 ,
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.Xr boot 8
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.Sh HISTORY
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The
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.Nm
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command first appeared in
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.Nx 1.3 .
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.Sh BUGS
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If
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.Nm
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is accidentally used on the whole disk partition, the RDB will be overwritten,
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making your system unusable after the next reboot.
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.Pp
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Some third-party accelerator boards are not autoconfiguring. You won't
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be able to use their memory when booting from the bootblock after a cold
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start.
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.Pp
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Some third-party disk controllers don't support bootblock booting.
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.Pp
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DraCo ROMs don't support bootblock booting from floppy disks.
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.Pp
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Most 68060 boards, unlike the DraCo, don't set the SysBase-\*[Gt]AttnFlags
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bit for the 68060 CPU (a patch program which is called during
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AmigaOS startup does this). You need to add options BB060STUPIDROM
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to your kernel to boot on such a machine.
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.Pp
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There is currently no easy way to edit the RDB from within
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.Nx .
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Therefore, you have to use HDTOOLBOX or a similar tool to
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set the partition to bootable, "use custom bootblocks" and the number
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of bootblocks to 16 (for bootxx_ffs) or 2 (for bootxx_fd), at least the first
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time you install the bootblock.
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.Pp
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As normal dd is used to install the bootblock, you can only install onto
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your currently used root (or any other mounted) partition from single-user
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mode, or while otherwise running in insecure mode.
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