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<table border=0 width=100% bgcolor="#d0d0d0"><tr> |
<table border=0 width=100% bgcolor="#d0d0d0"><tr> |
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<td width=100% align=center valign=center><table border=0 width=100%><tr> |
<td width=100% align=center valign=center><table border=0 width=100%><tr> |
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<td align="left" valign=center bgcolor="#d0efff"><font color="#6060e0" size="6"> |
<td align="left" valign=center bgcolor="#d0efff"><font color="#6060e0" size="6"> |
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<b>Gavare's eXperimental Emulator: </b></font> |
<b>Gavare's eXperimental Emulator:</b></font><br> |
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<font color="#000000" size="6"><b>Introduction</b> |
<font color="#000000" size="6"><b>Introduction</b> |
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</font></td></tr></table></td></tr></table><p> |
</font></td></tr></table></td></tr></table><p> |
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<!-- |
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$Id: intro.html,v 1.66 2005/11/23 22:03:24 debug Exp $ |
$Id: intro.html,v 1.110 2007/04/28 00:12:03 debug Exp $ |
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Copyright (C) 2003-2005 Anders Gavare. All rights reserved. |
Copyright (C) 2003-2007 Anders Gavare. All rights reserved. |
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Redistribution and use in source and binary forms, with or without |
Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are met: |
modification, are permitted provided that the following conditions are met: |
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<h2>Introduction</h2> |
<h2>Introduction</h2> |
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<p> |
<p> |
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<table border="0" width="99%"><tr><td valign="top" align="left"> |
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<ul> |
<ul> |
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<li><a href="#overview">Overview</a> |
<li><a href="#overview">Overview</a> |
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<li><a href="#free">Is GXemul Free software?</a> |
<li><a href="#free">Is GXemul Free software?</a> |
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<li><a href="#build">How to compile/build the emulator</a> |
<li><a href="#build">How to compile/build the emulator</a> |
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<li><a href="#run">How to run the emulator</a> |
<li><a href="#run">How to run the emulator</a> |
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<li><a href="#cpus">Which CPU types does GXemul emulate?</a> |
<li><a href="#cpus">Which processor architectures does GXemul emulate?</a> |
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<li><a href="#hosts">Which host architectures are supported?</a> |
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<li><a href="#accuracy">Emulation accuracy</a> |
<li><a href="#accuracy">Emulation accuracy</a> |
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<li><a href="#emulmodes">Which machines does GXemul emulate?</a> |
<li><a href="#emulmodes">Which machines does GXemul emulate?</a> |
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<li><a href="#guestos">Which guest OSes are possible to run in GXemul?</a> |
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</ul> |
</ul> |
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</td><td valign="center" align="center"> |
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<a href="20050317-example.png"><img src="20050317-example_small.png"></a> |
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<p>NetBSD/pmax 1.6.2 with X11<br>running in GXemul</td></tr></table> |
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hardware components are emulated well enough to let unmodified operating |
hardware components are emulated well enough to let unmodified operating |
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systems (e.g. NetBSD) run as if they were running on a real machine. |
systems (e.g. NetBSD) run as if they were running on a real machine. |
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<p>The processor architecture best emulated by GXemul is MIPS, but other |
<p>Devices and processors are not simulated with 100% accuracy. They are |
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architectures such as ARM and PowerPC are also partially emulated. |
only ``faked'' well enough to allow guest operating systems to run without |
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complaining too much. Still, the emulator could be of interest for |
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<p>Devices and CPUs are not simulated with 100% accuracy. They are only |
academic research and experiments, such as when learning how to write |
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``faked'' well enough to allow guest operating systems run without |
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complaining too much. Still, the emulator could be of interest for |
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academic research and experiments, such as when learning how to write |
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operating system code. |
operating system code. |
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<p>The emulator is written in C, does not depend on third-party libraries |
<p>The emulator is written in C, does not depend on third-party libraries, |
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(except X11, but that is optional), and should compile and run on most |
and should compile and run on most 64-bit and 32-bit Unix-like systems. |
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Unix-like systems. |
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<p>The emulator contains code which tries to emulate the workings of CPUs |
<p>The emulator contains code which tries to emulate the workings of CPUs |
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and surrounding hardware found in real machines, but it does not contain |
and surrounding hardware found in real machines, but it does not contain |
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<p>If you do not have a kernel as a separate file, but you have a bootable |
<p>If you do not have a kernel as a separate file, but you have a bootable |
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disk image, then it is sometimes possible to boot directly from that |
disk image, then it is sometimes possible to boot directly from that |
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image. (This works for example with DECstation emulation, or when booting |
image. (This works for example with DECstation emulation, Dreamcast |
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from ISO9660 CDROM images.) |
emulation, or when booting from generic ISO9660 CDROM images if the |
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kernel is included in the image as a plain file.) |
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<p>Thanks to (in no specific order) Joachim Buss, Olivier Houchard, Juli |
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Mallett, Juan Romero Pardines, Carl van Schaik, Alec Voropay, Göran |
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Weinholt, Alexander Yurchenko, and everyone else who has provided me with |
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feedback. |
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The "easiest way out" if you plan to redistribute code from GXemul is, of |
The "easiest way out" if you plan to redistribute code from GXemul is, of |
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course, to let it remain open source and simply supply the source code. |
course, to let it remain open source and simply supply the source code. |
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<p>(If a stable, unmodified release of GXemul is packaged into binary form, |
<p>In case you want to reuse parts of GXemul, but you need to do that |
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and it is clear which version of GXemul was used to build the package, |
under a different license (e.g. the GPL), then contact me and I might |
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then it can be argued that the source code is available, just not in that |
re-license/dual-license files on a case-by-case basis. |
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specific package. Common sense should be used in this case, and not |
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pedanticism.) |
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$ <b>make</b> |
$ <b>make</b> |
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</pre> |
</pre> |
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<p>This should work on most Unix-like systems. If it doesn't, then |
<p>This should work on most Unix-like systems. GXemul does not require any |
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mail me a bug report. |
specific libraries to build, however, if you build on a system which does |
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not have X11 libraries installed, some functionality will be lost. |
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<p>The emulator's performance is highly dependent on both runtime settings |
<p>The emulator's performance is highly dependent on both runtime settings |
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and on compiler settings, so you might want to experiment with different |
and on compiler settings, so you might want to experiment with different |
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CC and CFLAGS environment variable values. For example, on an AMD Athlon |
CC and CFLAGS environment variable values. For example, on an AMD Athlon |
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host, you might want to try setting <tt>CFLAGS</tt> to <tt>-march=athlon |
host, you might want to try setting <tt>CFLAGS</tt> to <tt>-march=athlon</tt> |
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-O3</tt> before running <tt>configure</tt>. |
before running <tt>configure</tt>. |
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<p><br> |
<p><br> |
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<a name="cpus"></a> |
<a name="cpus"></a> |
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<h3>Which CPU types does GXemul emulate?</h3> |
<h3>Which processor architectures does GXemul emulate?</h3> |
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<h4>MIPS:</h4> |
The architectures that are emulated well enough to let at least one |
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guest operating system run (per architecture) are ARM, MIPS, PowerPC, |
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and SuperH. |
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<p>Please read the page about <a href="guestoses.html">guest operating |
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systems</a> for more information about the machines and operating systems |
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that can be considered "working" in the emulator. |
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Emulation of R4000, which is a 64-bit CPU, was my initial goal. |
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R2000/R3000-like CPUs (32-bit), R1x000, and generic MIPS32/MIPS64-style |
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CPUs are also emulated, and are hopefully almost as stable as the R4000 |
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emulation. Several guest operating systems for MIPS can run inside |
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the emulator. |
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<p>(For MIPS emulation, I have written an experimental dynamic binary |
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translation subsystem, for Alpha and i386 hosts. This gives higher total |
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performance than interpreting one instruction at a time and executing it. |
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If you wish to disable bintrans, add <b>-B</b> to the command line.) |
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<h4>ARM:</h4> |
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ARM emulation is good enough to run NetBSD/cats 2.1 and OpenBSD/cats 3.8, |
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but it is not as tested or fine-tuned as the MIPS emulation mode. |
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<h4>PowerPC:</h4> |
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PowerPC emulation is still in its beginning stages, but good enough |
<p><br> |
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to run NetBSD/prep 2.1. |
<a name="hosts"></a> |
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<h3>Which host architectures are supported?</h3> |
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GXemul should compile and run on any modern host architecture (64-bit or |
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32-bit word-length). |
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<p>Non-MIPS emulation modes use dynamic translation, but not recompilation |
<p>Note: The <a href="translation.html">dynamic translation</a> engine |
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into native code. This makes it possible to run on any host platform. |
does <i>not</i> require backends for native code generation to be written |
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for each individual host architecture; the intermediate representation |
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that the dyntrans system uses can be executed on any host architecture. |
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<h3>Emulation accuracy:</h3> |
<h3>Emulation accuracy:</h3> |
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GXemul is an instruction-level emulator; things that would happen in |
GXemul is an instruction-level emulator; things that would happen in |
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several steps within a real CPU are not taken into account (eg. pipe-line |
several steps within a real CPU are not taken into account (e.g. pipe-line |
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stalls or out-of-order execution). Still, instruction-level accuracy seems |
stalls or out-of-order execution). Still, instruction-level accuracy seems |
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to be enough to be able to run complete guest operating systems inside the |
to be enough to be able to run complete guest operating systems inside the |
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emulator. |
emulator. |
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<p>Caches are by default not emulated. In some cases, the existance of |
<p>The existance of instruction and data caches is "faked" to let |
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caches is "faked" to let operating systems think that they are there. |
operating systems think that they are there, but for all practical |
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(There is some old code for R2000/R3000 caches, but it has probably |
purposes, these caches are non-working. |
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suffered from bitrot by now.) |
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<p>The emulator is in general <i>not</i> timing-accurate, neither at the |
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<p>The emulator is <i>not</i> timing-accurate. It can be run in a |
instruction level nor on any higher level. An attempt is made to let |
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"deterministic" mode, <tt><b>-D</b></tt>. The meaning of deterministic is |
emulated clocks run at the same speed as the host (i.e. an emulated timer |
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simply that running two emulations with the same settings will result in |
running at 100 Hz will interrupt around 100 times per real second), but |
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identical runs. Obviously, this requires that no user interaction is |
since the host speed may vary, e.g. because of other running processes, |
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taking place, and that clock speeds are fixed with the <tt><b>-I</b></tt> |
there is no guarantee as to how many instructions will be executed in |
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option. (Deterministic in this case does <i>not</i> mean that the |
each of these 100 Hz cycles. |
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emulation will be identical to some actual real-world machine.) |
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<p>If the host is very slow, the emulated clocks might even lag behind |
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<p><font color="#ff0000">(Oops/TODO: User interaction means <i>both</i> |
the real-world clock. |
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input to the emulated program/OS, and interacting with the emulator |
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itself. Breaking into the debugger and then continuing execution may |
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affect when/how interrupts occur.)</font> |
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<p> |
<p> |
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<ul> |
<ul> |
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<li><b><u>MIPS</u></b> |
<li><b><u>ARM</u></b> |
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<ul> |
<ul> |
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<li><b>DECstation 5000/200</b> ("3max") |
<li><b>CATS</b> (<a href="guestoses.html#netbsdcatsinstall">NetBSD/cats</a>, |
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<p> |
<a href="guestoses.html#openbsdcatsinstall">OpenBSD/cats</a>) |
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<li><b>Acer Pica-61</b> (an ARC machine) |
<li><b>IQ80321</b> (<a href="guestoses.html#netbsdevbarminstall">NetBSD/evbarm</a>) |
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<p> |
<li><b>NetWinder</b> (<a href="guestoses.html#netbsdnetwinderinstall">NetBSD/netwinder</a>) |
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<li><b>NEC MobilePro 770, 780, 800, and 880</b> (HPCmips machines) |
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<p> |
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<li><b>Cobalt</b> |
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<p> |
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<li><b>Malta</b> (evbmips) |
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<p> |
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<li><b>SGI O2 ("IP32")</b> |
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<br><small>(Enough for root-on-nfs, but not for disk boot.)</small> |
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</ul> |
</ul> |
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<p> |
<p> |
295 |
<li><b><u>ARM</u></b> |
<li><b><u>MIPS</u></b> |
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<ul> |
<ul> |
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<li><b>CATS</b> |
<li><b>DECstation 5000/200</b> (<a href="guestoses.html#netbsdpmaxinstall">NetBSD/pmax</a>, |
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<a href="guestoses.html#openbsdpmaxinstall">OpenBSD/pmax</a>, |
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<a href="guestoses.html#ultrixinstall">Ultrix</a>, |
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<a href="guestoses.html#declinux">Linux/DECstation</a>, |
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<a href="guestoses.html#sprite">Sprite</a>) |
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<li><b>Acer Pica-61</b> (<a href="guestoses.html#netbsdarcinstall">NetBSD/arc</a>) |
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<li><b>NEC MobilePro 770, 780, 800, 880</b> (<a href="guestoses.html#netbsdhpcmipsinstall">NetBSD/hpcmips</a>) |
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<li><b>Cobalt</b> (<a href="guestoses.html#netbsdcobaltinstall">NetBSD/cobalt</a>) |
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<li><b>Malta</b> (<a href="guestoses.html#netbsdevbmipsinstall">NetBSD/evbmips</a>, Linux/Malta <font color="#0000e0">(<super>*1</super>)</font>) |
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<li><b>Algorithmics P5064</b> (<a href="guestoses.html#netbsdalgorinstall">NetBSD/algor</a>) |
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<li><b>SGI O2 (aka IP32)</b> <font color="#0000e0">(<super>*2</super>)</font> |
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(<a href="guestoses.html#netbsdsgimips">NetBSD/sgi</a>) |
309 |
</ul> |
</ul> |
310 |
<p> |
<p> |
311 |
<li><b><u>PowerPC</u></b> |
<li><b><u>PowerPC</u></b> |
312 |
<ul> |
<ul> |
313 |
<li><b>PReP (PowerPC Reference Platform)</b> |
<li><b>IBM 6050/6070 (PReP, PowerPC Reference Platform)</b> (<a href="guestoses.html#netbsdprepinstall">NetBSD/prep</a>) |
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<li><b>MacPPC (generic "G4" Macintosh)</b> (<a href="guestoses.html#netbsdmacppcinstall">NetBSD/macppc</a>) |
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</ul> |
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<p> |
317 |
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<li><b><u>SuperH</u></b> |
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<ul> |
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<li><b>Sega Dreamcast</b> (<a href="dreamcast.html#netbsd_generic_md">NetBSD/dreamcast</a>, <a href="dreamcast.html#linux_live_cd">Linux/dreamcast</a>) |
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<li><b>Landisk</b> (<a href="guestoses.html#openbsdlandiskinstall">OpenBSD/landisk</a>) |
321 |
</ul> |
</ul> |
322 |
</ul> |
</ul> |
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<p> |
325 |
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<small><font color="#0000e0">(<super>*1</super>)</font> = |
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Linux/Malta may be run as a guest OS, however I have not yet found any stable |
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URL to pre-compiled Linux/Malta kernels. Thus, Linux/Malta emulation is not |
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tested for every release of the emulator; sometimes it works, sometimes |
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it doesn't.</small> |
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<br><small><font color="#0000e0">(<super>*2</super>)</font> = |
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SGI O2 emulation is enough for root-on-nfs, but not for disk boot.</small> |
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<p>There is code in GXemul for emulation of many other machine types; the |
<p>There is code in GXemul for emulation of many other machine types; the |
336 |
degree to which these work range from almost being able to run a complete |
degree to which these work range from almost being able to run a complete |
337 |
OS, to almost completely unsupported (perhaps just enough support to |
OS, to almost completely unsupported (perhaps just enough support to |
346 |
<li>a console I/O device (putchar() and getchar()...) |
<li>a console I/O device (putchar() and getchar()...) |
347 |
<li>an inter-processor communication device, for SMP experiments |
<li>an inter-processor communication device, for SMP experiments |
348 |
<li>a very simple linear framebuffer device (for graphics output) |
<li>a very simple linear framebuffer device (for graphics output) |
349 |
<li>a simple SCSI disk controller |
<li>a simple disk controller |
350 |
<li>a simple ethernet controller |
<li>a simple ethernet controller |
351 |
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<li>a real-time clock device |
352 |
</ul> |
</ul> |
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354 |
<p>This mode is useful if you wish to run experimental code, but do not |
<p>This mode is useful if you wish to run experimental code, but do not |
363 |
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364 |
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365 |
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<p><br> |
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<a name="guestos"></a> |
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<h3>Which guest OSes are possible to run in GXemul?</h3> |
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This table lists the guest OSes that run well enough to be considered |
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working in the emulator. They can boot from a harddisk image and be |
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interacted with similar to a real machine. |
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<p> |
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<center><table border="0"> |
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<tr> |
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<td width="10"></td> |
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<td align="center"><a href="20050317-example.png"><img src="20050317-example_small.png"></a></td> |
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<td width="15"></td> |
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<td><a href="http://www.netbsd.org/Ports/pmax/">NetBSD/pmax</a> |
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<br>DECstation 5000/200</td> |
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<td width="30"></td> |
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<td align="center"><a href="20041024-netbsd-arc-installed.gif"><img src="20041024-netbsd-arc-installed_small.gif"></a></td> |
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<td width="15"></td> |
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<td><a href="http://www.netbsd.org/Ports/arc/">NetBSD/arc</a> |
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<br>Acer Pica-61</td> |
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</tr> |
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<tr><td height="10"></td></tr> |
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<tr> |
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<td></td> |
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<td align="center"><a href="openbsd-pmax-20040710.png"><img src="openbsd-pmax-20040710_small.png"></a></td> |
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<td></td> |
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<td><a href="http://www.openbsd.org/pmax.html">OpenBSD/pmax</a> |
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<br>DECstation 5000/200</td> |
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<td></td> |
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<td align="center"><a href="20041024-openbsd-arc-installed.gif"><img src="20041024-openbsd-arc-installed_small.gif"></a></td> |
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<td></td> |
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<td><a href="http://www.openbsd.org/arc.html">OpenBSD/arc</a> |
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<br>Acer Pica-61</td> |
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</tr> |
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<tr><td height="10"></td></tr> |
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<tr> |
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<td></td> |
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<td align="center"><a href="ultrix4.5-20040706.png"><img src="ultrix4.5-20040706_small.gif"></a></td> |
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<td></td> |
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<td>Ultrix/RISC<br>DECstation 5000/200</td> |
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<td></td> |
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<td align="center"><a href="20041213-debian_4.png"><img src="20041213-debian_4_small.gif"></a></td> |
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<td></td> |
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<td><a href="http://www.debian.org/">Debian GNU/Linux</a> <super>*</super> |
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<br>DECstation 5000/200</td> |
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</tr> |
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<tr><td height="10"></td></tr> |
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<tr> |
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<td></td> |
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<td align="center"><a href="sprite-20040711.png"><img src="sprite-20040711_small.png"></a></td> |
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<td></td> |
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<td><a href="http://www.cs.berkeley.edu/projects/sprite/retrospective.html">Sprite</a> |
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<br>DECstation 5000/200</td> |
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<td></td> |
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<td align="center"><a href="20041129-redhat_mips.png"><img src="20041129-redhat_mips_small.png"></a></td> |
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<td></td> |
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<td>Redhat Linux <super>*</super> |
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<br>DECstation 5000/200</td> |
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</tr> |
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<tr><td height="10"></td></tr> |
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<tr> |
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<td></td> |
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<td align="center"><a href="20050427-netbsd-hpcmips-2.png"><img src="20050427-netbsd-hpcmips-2_small.png"></a></td> |
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<td></td> |
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<td><a href="http://www.netbsd.org/Ports/hpcmips/">NetBSD/hpcmips</a> |
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<br>NEC MobilePro 770, 780, 800, 880</td> |
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<td></td> |
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<td align="center"><a href="20050413-netbsd-cobalt.png"><img src="20050413-netbsd-cobalt_small.png"></a></td> |
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<td></td> |
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<td><a href="http://www.netbsd.org/Ports/cobalt/">NetBSD/cobalt</a> |
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<br>Cobalt</td> |
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</tr> |
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<tr><td height="10"></td></tr> |
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<tr> |
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<td></td> |
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<td align="center"><a href="20050626-netbsd-sgimips-netboot.png"><img src="20050626-netbsd-sgimips-netboot_small.png"></a></td> |
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<td></td> |
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<td><a href="http://www.netbsd.org/Ports/sgimips/">NetBSD/sgimips</a> |
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<br>SGI O2 ("IP32")</td> |
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<td></td> |
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<td align="center"><a href="20050622-netbsd-evbmips-malta.png"><img src="20050622-netbsd-evbmips-malta_small.png"></a></td> |
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<td></td> |
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<td><a href="http://www.netbsd.org/Ports/evbmips/">NetBSD/evbmips</a> |
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<br>5Kc (and 4Kc) Malta<br>evaluation boards</td> |
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<td></td> |
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</tr> |
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<tr><td height="10"></td></tr> |
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<tr> |
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<td></td> |
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<td align="center"><a href="20051007-netbsd-cats-installed.png"><img src="20051007-netbsd-cats-installed_small.png"></a></td> |
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<td></td> |
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<td><a href="http://www.netbsd.org/Ports/cats/">NetBSD/cats</a> |
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<br>CATS</td> |
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<td></td> |
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<td align="center"><a href="20051007-openbsd-cats-installed.png"><img src="20051007-openbsd-cats-installed_small.png"></a></td> |
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<td></td> |
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<td><a href="http://www.openbsd.org/cats.html">OpenBSD/cats</a> |
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<br>CATS</td> |
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<td></td> |
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</tr> |
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<tr><td height="10"></td></tr> |
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<tr> |
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<td></td> |
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<td align="center"><a href="20051123-netbsd-prep.png"><img src="20051123-netbsd-prep_small.png"></a></td> |
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<td></td> |
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<td><a href="http://www.netbsd.org/Ports/prep/">NetBSD/prep</a> |
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<br>PReP</td> |
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<td></td> |
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</tr> |
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</table></center> |
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<p><br> |
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<super>*</super> Although Linux runs under DECstation emulation, the |
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default 2.4.27 kernel in Debian GNU/Linux does not support keyboards on |
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the 5000/200 (the specific DECstation model being emulated), so when the |
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login prompt is reached you cannot interact with the system. Kaj-Michael |
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Lang has compiled and made available a newer kernel from the current |
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mips-linux development tree. You can find it here: <a |
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href="http://home.tal.org/~milang/o2/kernels/">http://home.tal.org/~milang/o2/kernels</a>/<a |
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href="http://home.tal.org/~milang/o2/kernels/vmlinux-2.4.29-rc2-r3k-mipsel-decstation">vmlinux-2.4.29-rc2-r3k-mipsel-decstation</a> |
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This newer kernel supports keyboard input, but it does not have Debian's |
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ethernet patches, so you will not be able to use keyboard/framebuffer |
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<i>and</i> networking at the same time. |
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366 |
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367 |
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