126 lines
4.3 KiB
Groff
126 lines
4.3 KiB
Groff
.\" $NetBSD: boot.8,v 1.2 2006/12/31 09:40:18 wiz Exp $
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.\"
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.\" Copyright (c) 2006 Stephen M. Rumble
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.\" All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd December 30, 2006
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.Dt BOOT 8 sgimips
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.Os
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.Sh NAME
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.Nm boot
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.Nd sgimips system bootstrapping procedures
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.Sh DESCRIPTION
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.Tn Silicon Graphics
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MIPS-based computers all feature essentially similar firmware systems.
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However, as of the Indigo R4x00 series (IP20), quasi-
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.Tn ARCS
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(Advanced RISC Computing Specification) compatible features are also present.
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All known PROM implementations support loading executables from disk
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devices, as well as from the network via BOOTP and TFTP.
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.Sh Disk Booting
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.Tn SGI
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provides a small filesystem at the beginning of each bootable disk called
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a Volume Header, which contains a boot loader and other standalone utilities.
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Booting
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.Nx
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requires that we write our bootloader into to the volume header using
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.Xr sgivol 8 .
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.Pp
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Once a bootloader is present in the volume header, it may be executed
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directly by the PROM either manually, or at boot time using the
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.Dq OSLoader
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PROM environment variable.
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The
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.Nx
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bootloader will obtain the kernel filename to boot from the PROM or EEPROM.
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This is specified by setting the PROM environment variable
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.Dq OSLoadFilename
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to an appropriate value.
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For instance,
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.Dq /netbsd.ecoff .
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.Pp
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For example, the following will configure the PROM to use the bootloader
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.Dq aoutboot
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to load the kernel
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.Dq netbsd.old
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.Pp
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.Dl Ic setenv OSLoader aoutboot
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.Dl Ic setenv OSLoadFilename netbsd.old
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.Sh Network Booting
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The system firmware will obtain an IP address, TFTP server address, and an
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optional filename from the BOOTP server and download it via TFTP.
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The PROM's configurable network address environment variable
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.Dq netaddr
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must match the address provided by the BOOTP server.
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.Pp
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An example BOOTP entry for
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.Xr dhcpd 8
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follows:
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.Pp
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.Bd -unfilled -offset indent
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host indigo3k {
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hardware ethernet 08:00:69:42:42:42;
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fixed-address 192.168.0.2;
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option host-name "indigo3k.foo";
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#filename "/netbsd.ecoff";
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next-server 192.168.185.1;
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option root-path "/export/indigo3k/root";
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server-name "192.168.0.1";
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}
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.Ed
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.Pp
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To boot a kernel named
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.Dq netbsd.ecoff
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the user would type:
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.Dl Ic boot -f bootp():/netbsd.ecoff
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.Pp
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See
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.Xr dhcpd.conf 5
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for more information on configuring
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.dhcpd 8
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as a BOOTP server.
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.Sh SEE ALSO
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.Xr dhcpd.conf 5 ,
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.Xr dhcpd 8 ,
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.Xr sgivol 8
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.Sh CAVEATS
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Some older PROM revisions do not support loading of ELF images.
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The build system automatically prepares ECOFF versions, which are
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correctly interpreted.
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.Sh BUGS
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.Nx
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does not support booting from disk on systems lacking an ARCS-compatible
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firmware (presently supported systems include Personal Iris and Indigo R3000).
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It is possible to work around this by creating a sufficiently large volume
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header and placing the kernel in it, or by network booting.
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.Pp
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Some firmware revisions have a bug, which precludes them from communicating
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with TFTP servers using ports above 32767.
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When using
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.Nx
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as the TFTP server, this problem may be worked around as follows:
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.Pp
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.Dl Ic sysctl -w net.inet.ip.anonportmin=20000
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.Dl Ic sysctl -w net.inet.ip.anonportmax=32767
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.Pp
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This man page is horribly incomplete.
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