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<title>GXemul: IBM 6050/6070 PReP emulation</title>
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<h1>GXemul: IBM 6050/6070 PReP emulation</h1>
<p>
<a href="./">Back to the index.</a>
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<p>This emulation mode attempts to emulate an IBM 6050/6070, which was a
<a href="https://en.wikipedia.org/wiki/PowerPC_Reference_Platform">PowerPC
Reference Platform</a> machine (a.k.a. PReP).
<p><br>
<a name="netbsdprepinstall"></a>
<h3>NetBSD/prep:</h3>
<p>It is possible to install and run <a
href="http://www.netbsd.org/ports/prep/">NetBSD/prep</a> 2.1 in GXemul on
an emulated IBM 6050 (PowerPC) machine. (Newer versions of NetBSD/prep use
the wdc controller in a way which isn't implemented in GXemul yet, or
there are bugs in GXemul's PowerPC CPU emulation.)
<p>
<a href="20051123-netbsd-prep.png"><img src="20051123-netbsd-prep_small.png"></a>
<p>To install NetBSD/prep onto a disk image, follow these instructions:
<p>
<ol start="1">
<li>Create an empty harddisk image, which will be the root disk
that you will install NetBSD/prep onto:<pre>
<b>dd if=/dev/zero of=nbsd_prep.img bs=1024 count=1 seek=1000000</b>
</pre>
<li>Download the NetBSD/prep 2.1 ISO image and the generic kernel:<pre>
<a href="ftp://ftp.netbsd.org/pub/NetBSD/iso/2.1/prepcd.iso">ftp://ftp.netbsd.org/pub/NetBSD/iso/2.1/prepcd.iso</a>
<a href="ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-2.1/prep/binary/kernel/netbsd-GENERIC.gz">ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-2.1/prep/binary/kernel/netbsd-GENERIC.gz</a>
</pre>
<p>
<li>Start the installation like this:<pre>
<b>gxemul -X -e ibm6050 -d nbsd_prep.img -d rdb:prepcd.iso -j prep/binary/kernel/netbsd-INSTALL.gz</b>
</pre>
<p>
<li>Installation is a bit unsmooth, possibly due to bugs in GXemul,
possibly due to bugs in NetBSD itself; others have been having
problems on real hardware: <a href="http://mail-index.NetBSD.org/port-prep/2005/11/25/0004.html">http://mail-index.NetBSD.org/port-prep/2005/11/25/0004.html</a>.
Creating an MBR slice and a disklabel with sysinst bugs out, so
some things have to be done manually:<p>
At "<tt>(I)nstall, (S)hell, or (H)alt</tt>", choose
<tt><b><u>s</u></b></tt>.
<br><tt># <b><u>fdisk -u wd0</u></b></tt>
<br><tt>Do you want to change our idea of what BIOS thinks? [n]</tt>
(just press <b>ENTER</b>)
<br><tt>Which partition do you want to change?: [none] <b><u>0</u></b></tt>
<br><tt>sysid: ... </tt> (just press <B>ENTER</b>)
<br><tt>start: ... <b><u>1cyl</u></b></tt>
<br><tt>size: ... </tt> (just press <B>ENTER</b>)
<br><tt>Which partition do you want to change?: [none]</tt> (press <b>ENTER</b>)
<br><tt>Should we write new partition table? [n] <b><u>y</u></b></tt>
<br><tt># <b><u>disklabel -I -i wd0</u></b></tt>
<br><tt>partition> <b><u>a</u></b></tt>
<br><tt>Filesystem type [?] [unused]: <b><u>4.2BSD</u></b></tt>
<br><tt>Start offset ('x' to start after partition 'x') [0c, 0s, 0M]: <b><u>1c</u></b></tt>
<br><tt>Partition size ('$' for all remaining) [0c, 0s, 0M]: <b><u>900M</u></b></tt>
<br><tt>partition> <b><u>b</u></b></tt>
<br><tt>Filesystem type [?] [unused]: <b><u>swap</u></b></tt>
<br><tt>Start offset ('x' to start after partition 'x') [0c, 0s, 0M]: <b><u>a</u></b></tt>
<br><tt>Partition size ('$' for all remaining) [0c, 0s, 0M]: <b><u>$</u></b></tt>
<br><tt>partition> <b><u>W</u></b></tt>
<br><tt>Label disk [n]? <b><u>y</u></b></tt>
<br><tt>partition> <b><u>Q</u></b></tt>
<br><tt># <b><u>newfs wd0a</u></b></tt>
<br><tt># <b><u>sysinst</u></b></tt>
<br>Choose to install onto <b>wd0</b>. Choose
"<tt>a: Edit the MBR partition table</tt>"
when presented with that option.
<br>Choose the 'a' partition/slice,
set the 'e' ("active") and 'f' ("install") fields to <b>Yes</b>,
and then choose "<tt>x: Partition table OK</tt>".
<br>Choose "<tt>b: Use existing partition sizes</tt>" in the next
menu.
<br>Select partition 'a' and press ENTER. Set field 'k' (mount point)
to '<tt><b>/</b></tt>'.
<br>Get out of the partitioner by selecting
"<tt>x: Partition sizes ok</tt>" twice.
<br>At "<tt>Write outside MBR partition? [n]:</tt>", just press
<b>ENTER</b>.
<br>Install from CD-ROM, device <b>wd1c</b>.
</ol>
<p>If everything worked, NetBSD should now be installed on the disk image.
Use the following command line to boot the emulated machine:<pre>
<b>gxemul -X -e ibm6050 -d nbsd_prep.img netbsd-GENERIC.gz</b>
</pre>
<p>When asked which the root device is, type <tt><b>wd0</b></tt> and
just press ENTER to select the default values for dump device, file
system type, and init path.
<p><br>
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