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$Id: HISTORY,v 1.982 2005/10/07 22:45:32 debug Exp $
20050816	Some success in decoding the way the SGI O2 PROM draws graphics
		during bootup; lines/rectangles and bitmaps work, enough to
		show the bootlogo etc. :-)
		Adding more PPC instructions, and (dummy) BAT registers.
20050817	Updating the pckbc to support scancode type 3 keyboards
		(required in order to interact with the SGI O2 PROM).
		Adding more PPC instructions.
20050818	Adding more ARM instructions; general register forms.
		Importing armreg.h from NetBSD (ARM cpu ids). Adding a (dummy)
		CATS machine mode (using SA110 as the default CPU).
		Continuing on general dyntrans related stuff.
20050819	Register forms for ARM load/stores. Gaah! The Compaq C Compiler
		bug is triggered for ARM loads as well, not just PPC :-(
		Adding full support for ARM PC-relative load/stores, and load/
		stores where the PC register is the destination register.
		Adding support for ARM a.out binaries.
20050820	Continuing to add more ARM instructions, and correcting some
		bugs. Continuing on CATS emulation.
		More work on the PPC stuff.
20050821	Minor PPC and ARM updates. Adding more machine types.
20050822	All ARM "data processing instructions" are now generated
		automatically.
20050824	Beginning the work on the ARM system control coprocessor.
		Adding support for ARM halfword load/stores, and signed loads.
20050825	Fixing an important bug related to the ARM condition codes.
		OpenBSD/zaurus and NetBSD/netwinder now print some boot
		messages. :)
		Adding a dummy SH (Hitachi SuperH) cpu family.
		Beginning to add some ARM virtual address translation.
		MIPS bugfixes: unaligned PC now cause an ADEL exception (at
		least for non-bintrans execution), and ADEL/ADES (not
		TLBL/TLBS) are used if userland tries to access kernel space.
		(Thanks to Joshua Wise for making me aware of these bugs.)
20050827	More work on the ARM emulation, and various other updates.
20050828	More ARM updates.
		Finally taking the time to work on translation invalidation
		(i.e. invalidating translated code mappings when memory is
		written to). Hopefully this doesn't break anything.
20050829	Moving CPU related files from src/ to a new subdir, src/cpus/.
		Moving PROM emulation stuff from src/ to src/promemul/.
		Better debug instruction trace for ARM loads and stores.
20050830	Various ARM updates (correcting CMP flag calculation, etc).
20050831	PPC instruction updates. (Flag fixes, etc.)
20050901	Various minor PPC and ARM instruction emulation updates.
		Minor OpenFirmware emulation updates.
20050903	Adding support for adding arbitrary ARM coprocessors (with
		the i80321 I/O coprocessor as a first test).
		Various other ARM and PPC updates.
20050904	Adding some SHcompact disassembly routines.
20050907	(Re)adding a dummy HPPA CPU module, and a dummy i960 module.
20050908	Began hacking on some Apple Partition Table support.
20050909	Adding support for loading Mach-O (Darwin PPC) binaries.
20050910	Fixing an ARM bug (Carry flag was incorrectly updated for some
		data processing instructions); OpenBSD/cats and NetBSD/
		netwinder get quite a bit further now.
		Applying a patch to dev_wdc, and a one-liner to dev_pcic, to
		make them work better when emulating new versions of OpenBSD.
		(Thanks to Alexander Yurchenko for the patches.)
		Also doing some other minor updates to dev_wdc. (Some cleanup,
		and finally converting to devinit, etc.)
20050912	IRIX doesn't have u_int64_t by default (noticed by Andreas
		<avr@gnulinux.nl>); configure updated to reflect this.
		Working on ARM register bank switching, CPSR vs SPSR issues,
		and beginning the work on interrupt/exception support.
20050913	Various minor ARM updates (speeding up load/store multiple,
		and fixing a ROR bug in R(); NetBSD/cats now boots as far as
		OpenBSD/cats).
20050917	Adding a dummy Atmel AVR (8-bit) cpu family skeleton.
20050918	Various minor updates.
20050919	Symbols are now loaded from Mach-O executables.
		Continuing the work on adding ARM exception support.
20050920	More work on ARM stuff: OpenBSD/cats and NetBSD/cats reach
		userland! :-)
20050921	Some more progress on ARM interrupt specifics.
20050923	Fixing linesize for VR4121 (patch by Yurchenko). Also fixing
		linesizes/cachesizes for some other VR4xxx.
		Adding a dummy Acer Labs M1543 PCI-ISA bridge (for CATS) and a
		dummy Symphony Labs 83C553 bridge (for Netwinder), usable by 
		dev_footbridge.
20050924	Some PPC progress.
20050925	More PPC progress.
20050926	PPC progress (fixing some bugs etc); Darwin's kernel gets
		slightly further than before.
20050928	Various updates: footbridge/ISA/pciide stuff, and finally
		fixing the VGA text scroll-by-changing-the-base-offset bug.
20050930	Adding a dummy S3 ViRGE pci card for CATS emulation, which
		both NetBSD and OpenBSD detects as VGA.
		Continuing on Footbridge (timers, ISA interrupt stuff).
20051001	Continuing... there are still bugs, probably interrupt-
		related.
20051002	More work on the Footbridge (interrupt stuff).
20051003	Various minor updates. (Trying to find the bug(s).)
20051004	Continuing on the ARM stuff.
20051005	More ARM-related fixes.
20051007	FINALLY! Found and fixed 2 ARM bugs: 1 memory related, and the
		other was because of an error in the ARM manual (load multiple
		with the S-bit set should _NOT_ load usermode registers, as the
		manual says, but it should load saved registers, which may or
		may not happen to be usermode registers).
		NetBSD/cats and OpenBSD/cats seem to install fine now :-)
		except for a minor bug at the end of the OpenBSD/cats install.
		Updating the documentation, preparing for the next release.
20051008	Continuing with release testing and cleanup.

1 <html><head><title>Gavare's eXperimental Emulator:&nbsp;&nbsp;&nbsp;Introduction</title>
2 <meta name="robots" content="noarchive,nofollow,noindex"></head>
3 <body bgcolor="#f8f8f8" text="#000000" link="#4040f0" vlink="#404040" alink="#ff0000">
4 <table border=0 width=100% bgcolor="#d0d0d0"><tr>
5 <td width=100% align=center valign=center><table border=0 width=100%><tr>
6 <td align="left" valign=center bgcolor="#d0efff"><font color="#6060e0" size="6">
7 <b>Gavare's eXperimental Emulator:&nbsp;&nbsp;&nbsp;</b></font>
8 <font color="#000000" size="6"><b>Introduction</b>
9 </font></td></tr></table></td></tr></table><p>
10
11 <!--
12
13 $Id: intro.html,v 1.64 2005/10/07 22:45:33 debug Exp $
14
15 Copyright (C) 2003-2005 Anders Gavare. All rights reserved.
16
17 Redistribution and use in source and binary forms, with or without
18 modification, are permitted provided that the following conditions are met:
19
20 1. Redistributions of source code must retain the above copyright
21 notice, this list of conditions and the following disclaimer.
22 2. Redistributions in binary form must reproduce the above copyright
23 notice, this list of conditions and the following disclaimer in the
24 documentation and/or other materials provided with the distribution.
25 3. The name of the author may not be used to endorse or promote products
26 derived from this software without specific prior written permission.
27
28 THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
29 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 SUCH DAMAGE.
39
40 -->
41
42 <a href="./">Back to the index</a>
43
44 <p><br>
45 <h2>Introduction</h2>
46
47 <p>
48 <ul>
49 <li><a href="#overview">Overview</a>
50 <li><a href="#free">Is GXemul Free software?</a>
51 <li><a href="#build">How to compile/build the emulator</a>
52 <li><a href="#run">How to run the emulator</a>
53 <li><a href="#cpus">Which CPU types does GXemul emulate?</a>
54 <li><a href="#accuracy">Emulation accuracy</a>
55 <li><a href="#emulmodes">Which machines does GXemul emulate?</a>
56 <li><a href="#guestos">Which guest OSes are possible to run in GXemul?</a>
57 </ul>
58
59
60
61
62
63 <p><br>
64 <a name="overview"></a>
65 <h3>Overview:</h3>
66
67 GXemul is an experimental instruction-level machine emulator. Several
68 emulation modes are available. In some modes, processors and surrounding
69 hardware components are emulated well enough to let unmodified operating
70 systems (e.g. NetBSD) run as if they were running on a real machine.
71
72 <p>The processor architecture best emulated by GXemul is MIPS, but other
73 architectures are also partially emulated.
74
75 <p>Devices and CPUs are not simulated with 100% accuracy. They are only
76 ``faked'' well enough to make operating systems (e.g. NetBSD) run without
77 complaining too much. Still, the emulator could be of interest for
78 academic research and experiments, such as when learning how to write
79 operating system code.
80
81 <p>The emulator is written in C, does not depend on external libraries
82 (except X11, but that is optional), and should compile and run on most
83 Unix-like systems. If it doesn't, then that is a bug.
84
85 <p>The emulator contains code which tries to emulate the workings of CPUs
86 and surrounding hardware found in real machines, but it does not contain
87 any ROM code. You will need some form of program (in binary form) to run
88 in the emulator. For many emulation modes, PROM calls are handled by the
89 emulator itself, so you do not need to use any ROM image at all.
90
91 <p>You can use pre-compiled kernels (for example NetBSD kernels, or
92 Linux), or other programs that are in binary format, and in some cases
93 even actual ROM images. A couple of different file formats are supported
94 (ELF, a.out, ECOFF, SREC, and raw binaries).
95
96 <p>If you do not have a kernel as a separate file, but you have a bootable
97 disk image, then it is sometimes possible to boot directly from that
98 image. (This works for example with DECstation emulation, or when booting
99 from ISO9660 CDROM images.)
100
101
102
103
104
105
106
107
108 <p><br>
109 <a name="free"></a>
110 <h3>Is GXemul Free software?</h3>
111
112 Yes. I have released GXemul under a Free license. The code in GXemul is
113 Copyrighted software, it is <i>not</i> public domain. (If this is
114 confusing to you, you might want to read up on the definitions of the
115 four freedoms associated with Free software, <a
116 href="http://www.gnu.org/philosophy/free-sw.html">http://www.gnu.org/philosophy/free-sw.html</a>.)
117
118 <p>The code I have written is released under a 3-clause BSD-style license
119 (or "revised BSD-style" if one wants to use <a
120 href="http://www.gnu.org/philosophy/bsd.html">GNU jargon</a>). Apart from
121 the code I have written, some files are copied from other sources such as
122 NetBSD, for example header files containing symbolic names of bitfields in
123 device registers. They are also covered by similar licenses, but with some
124 additional clauses. The main point, however, is that the licenses require
125 that the original Copyright and license terms are included when you make a
126 copy or modification.
127
128 <p>If you plan to redistribute GXemul <i>without</i> supplying the source
129 code, then you need to comply with each individual source file some other
130 way, for example by writing additional documentation containing copyright
131 notes. I have not done this, since I do not plan on making distributions
132 without source code. You need to check all individual files for details.
133 The "easiest way out" if you plan to redistribute code from GXemul is, of
134 course, to let it remain open source and simply supply the source code.
135
136 <p>(If a stable, unmodified release of GXemul is packaged into binary form,
137 and it is clear which version of GXemul was used to build the package,
138 then it can be argued that the source code is available, just not in that
139 specific package. Common sense should be used in this case, and not
140 pedanticism.)
141
142
143
144
145
146
147 <p><br>
148 <a name="build"></a>
149 <h3>How to compile/build the emulator:</h3>
150
151 Uncompress the .tar.gz distribution file, and run
152 <pre>
153 $ <b>./configure</b>
154 $ <b>make</b>
155 </pre>
156
157 <p>This should work on most Unix-like systems. If it doesn't, then
158 mail me a bug report.
159
160 <p>The emulator's performance is highly dependent on both runtime settings
161 and on compiler settings, so you might want to experiment with different
162 CC and CFLAGS environment variable values. For example, on a modern PC,
163 you could try the following:
164 <p><pre>
165 $ <b>CFLAGS="-mcpu=pentium4 -O3" ./configure</b>
166 $ <b>make</b>
167 </pre>
168
169
170
171
172
173
174
175 <p><br>
176 <a name="run"></a>
177 <h3>How to run the emulator:</h3>
178
179 Once you have built GXemul, running it should be rather straight-forward.
180 Running <tt><b>gxemul</b></tt> without arguments (or with the
181 <b><tt>-h</tt></b> or <b><tt>-H</tt></b> command line options) will
182 display a help message.
183
184 <p>
185 To get some ideas about what is possible to run in the emulator, please
186 read the section about <a href="guestoses.html">installing "guest"
187 operating systems</a>. If you are interested in using the emulator to
188 develop code on your own, then you should also read the section about
189 <a href="experiments.html#hello">Hello World</a>.
190
191 <p>
192 To exit the emulator, type CTRL-C to enter the
193 single-step debugger, and then type <tt><b>quit</b></tt>.
194
195 <p>
196 If you are starting an emulation by entering settings directly on the
197 command line, and you are not using the <tt><b>-x</b></tt> option, then all
198 terminal input and output will go to the main controlling terminal.
199 CTRL-C is used to break into the debugger, so in order to send CTRL-C to
200 the running (emulated) program, you may use CTRL-B.
201 (This should be a reasonable compromise to allow the emulator to be usable
202 even on systems without X Windows.)
203
204 <p>
205 There is no way to send an actual CTRL-B to the emulated program, when
206 typing in the main controlling terminal window. The solution is to either
207 use <a href="configfiles.html">configuration files</a>, or use
208 <tt><b>-x</b></tt>. Both these solutions cause new xterms to be opened for
209 each emulated serial port that is written to. CTRL-B and CTRL-C both have
210 their original meaning in those xterm windows.
211
212
213
214
215
216 <p><br>
217 <a name="cpus"></a>
218 <h3>Which CPU types does GXemul emulate?</h3>
219
220 <h4>MIPS:</h4>
221
222 Emulation of R4000, which is a 64-bit CPU, was my initial goal.
223 R2000/R3000-like CPUs (32-bit), R1x000, and generic MIPS32/MIPS64-style
224 CPUs are also emulated, and are hopefully almost as stable as the R4000
225 emulation.
226
227 <p>I have written an experimental dynamic binary translation subsystem.
228 This gives higher total performance than interpreting one instruction at a
229 time and executing it. (If you wish to disable bintrans, add <b>-B</b> to
230 the command line.)
231
232 <h4>ARM:</h4>
233
234 The ARM CPU emulation is good enough to run NetBSD/cats and OpenBSD/cats
235 (almost bugfree :-), but it is not as tested or fine-tuned as the MIPS
236 emulation.
237
238 <h4>Other CPU types:</h4>
239
240 Some other CPU architectures can also be partially emulated. These are not
241 working well enough yet to run guest operating systems.
242
243
244
245
246
247
248 <p><br>
249 <a name="accuracy"></a>
250 <h3>Emulation accuracy:</h3>
251
252 GXemul is an instruction-level emulator; things that would happen in
253 several steps within a real CPU are not taken into account (eg. pipe-line
254 stalls or out-of-order execution). Still, instruction-level accuracy seems
255 to be enough to be able to run complete guest operating systems inside the
256 emulator.
257
258 <p>Caches are by default not emulated. In some cases, the existance of
259 caches is "faked" to let operating systems think that they are there.
260 (There is some old code for R2000/R3000 caches, but it has probably
261 suffered from bitrot by now.)
262
263 <p>The emulator is <i>not</i> timing-accurate. It can be run in a
264 "deterministic" mode, <tt><b>-D</b></tt>. The meaning of deterministic is
265 simply that running two emulations with the same settings will result in
266 identical runs. Obviously, this requires that no user interaction is
267 taking place, and that clock speeds are fixed with the <tt><b>-I</b></tt>
268 option. (Deterministic in this case does <i>not</i> mean that the
269 emulation will be identical to some actual real-world machine.)
270
271
272
273
274
275 <p><br>
276 <a name="emulmodes"></a>
277 <h3>Which machines does GXemul emulate?</h3>
278
279 A few different machine types are emulated. The following machine types
280 are emulated well enough to run at least one "guest OS":
281
282 <p>
283 <ul>
284 <li><b><u>MIPS</u></b>
285 <ul>
286 <li><b>DECstation 5000/200</b>&nbsp;&nbsp;("3max")
287 <br>Serial controller (including keyboard and mouse), ethernet,
288 SCSI, and graphical framebuffers.
289 <p>
290 <li><b>Acer Pica-61</b>&nbsp;&nbsp;(an ARC machine)
291 <br>Serial controller, "VGA" text console, and SCSI.
292 <p>
293 <li><b>NEC MobilePro 770, 780, 800, and 880</b>&nbsp;&nbsp;(HPCmips machines)
294 <br>Framebuffer, keyboard, and a PCMCIA IDE controller.
295 <p>
296 <li><b>Cobalt</b>
297 <br>Serial controller and PCI IDE.
298 <p>
299 <li><b>Malta (evbmips)</b>
300 <br>Serial controller and PCI IDE.
301 <p>
302 <li><b>SGI O2 ("IP32")</b>
303 <br>Serial controller and ethernet.&nbsp;&nbsp;<small>(Enough for
304 root-on-nfs, but not for disk boot.)</small>
305 </ul>
306 <p>
307 <li><b><u>ARM</u></b>
308 <ul>
309 <li><b>CATS</b>
310 <br>VGA and PCI IDE.
311 </ul>
312 </ul>
313
314 <p>There is code in GXemul for emulation of many other machine types; the
315 degree to which these work range from almost being able to run a complete
316 OS, to almost completely unsupported (perhaps just enough support to
317 output a few boot messages via serial console).
318
319 <p>In addition to emulating real machines, there is also a "test-machine".
320 A test-machine consists of one or more CPUs and a few experimental devices
321 such as:
322
323 <p>
324 <ul>
325 <li>a console I/O device (putchar() and getchar()...)
326 <li>an inter-processor communication device, for SMP experiments
327 <li>a very simple linear framebuffer device (for graphics output)
328 <li>a simple SCSI disk controller
329 <li>a simple ethernet controller
330 </ul>
331
332 <p>This mode is useful if you wish to run experimental code, but do not
333 wish to target any specific real-world machine type, for example for
334 educational purposes.
335
336 <p>You can read more about these experimental devices <a
337 href="experiments.html#expdevices">here</a>.
338
339
340
341
342
343
344
345 <p><br>
346 <a name="guestos"></a>
347 <h3>Which guest OSes are possible to run in GXemul?</h3>
348
349 This table lists the guest OSes that run well enough to be considered
350 working in the emulator. They can boot from a harddisk image and be
351 interacted with similar to a real machine.
352
353 <p>
354 <center><table border="0">
355 <tr>
356 <td width="10"></td>
357 <td align="center"><a href="20050317-example.png"><img src="20050317-example_small.png"></a></td>
358 <td width="15"></td>
359 <td><a href="http://www.netbsd.org/Ports/pmax/">NetBSD/pmax</a>
360 <br>DECstation 5000/200</td>
361 <td width="30"></td>
362 <td align="center"><a href="20041024-netbsd-arc-installed.gif"><img src="20041024-netbsd-arc-installed_small.gif"></a></td>
363 <td width="15"></td>
364 <td><a href="http://www.netbsd.org/Ports/arc/">NetBSD/arc</a>
365 <br>Acer Pica-61</td>
366
367 </tr>
368
369 <tr><td height="10"></td></tr>
370
371 <tr>
372 <td></td>
373 <td align="center"><a href="openbsd-pmax-20040710.png"><img src="openbsd-pmax-20040710_small.png"></a></td>
374 <td></td>
375 <td><a href="http://www.openbsd.org/pmax.html">OpenBSD/pmax</a>
376 <br>DECstation 5000/200</td>
377 <td></td>
378 <td align="center"><a href="20041024-openbsd-arc-installed.gif"><img src="20041024-openbsd-arc-installed_small.gif"></a></td>
379 <td></td>
380 <td><a href="http://www.openbsd.org/arc.html">OpenBSD/arc</a>
381 <br>Acer Pica-61</td>
382 </tr>
383
384 <tr><td height="10"></td></tr>
385
386 <tr>
387 <td></td>
388 <td align="center"><a href="ultrix4.5-20040706.png"><img src="ultrix4.5-20040706_small.gif"></a></td>
389 <td></td>
390 <td>Ultrix/RISC<br>DECstation 5000/200</td>
391 <td></td>
392 <td align="center"><a href="20041213-debian_4.png"><img src="20041213-debian_4_small.gif"></a></td>
393 <td></td>
394 <td><a href="http://www.debian.org/">Debian&nbsp;GNU/Linux</a>&nbsp;<super>*</super>
395 <br>DECstation 5000/200</td>
396 </tr>
397
398 <tr><td height="10"></td></tr>
399
400 <tr>
401 <td></td>
402 <td align="center"><a href="sprite-20040711.png"><img src="sprite-20040711_small.png"></a></td>
403 <td></td>
404 <td><a href="http://www.cs.berkeley.edu/projects/sprite/retrospective.html">Sprite</a>
405 <br>DECstation 5000/200</td>
406 <td></td>
407 <td align="center"><a href="20041129-redhat_mips.png"><img src="20041129-redhat_mips_small.png"></a></td>
408 <td></td>
409 <td>Redhat&nbsp;Linux&nbsp;<super>*</super>
410 <br>DECstation 5000/200</td>
411 </tr>
412
413 <tr><td height="10"></td></tr>
414
415 <tr>
416 <td></td>
417 <td align="center"><a href="20050427-netbsd-hpcmips-2.png"><img src="20050427-netbsd-hpcmips-2_small.png"></a></td>
418 <td></td>
419 <td><a href="http://www.netbsd.org/Ports/hpcmips/">NetBSD/hpcmips</a>
420 <br>NEC MobilePro 770, 780, 800, 880</td>
421 <td></td>
422 <td align="center"><a href="20050413-netbsd-cobalt.png"><img src="20050413-netbsd-cobalt_small.png"></a></td>
423 <td></td>
424 <td><a href="http://www.netbsd.org/Ports/cobalt/">NetBSD/cobalt</a>
425 <br>Cobalt</td>
426 </tr>
427
428 <tr><td height="10"></td></tr>
429
430 <tr>
431 <td></td>
432 <td align="center"><a href="20050626-netbsd-sgimips-netboot.png"><img src="20050626-netbsd-sgimips-netboot_small.png"></a></td>
433 <td></td>
434 <td><a href="http://www.netbsd.org/Ports/sgimips/">NetBSD/sgimips</a>
435 <br>SGI O2 ("IP32")</td>
436 <td></td>
437 <td align="center"><a href="20050622-netbsd-evbmips-malta.png"><img src="20050622-netbsd-evbmips-malta_small.png"></a></td>
438 <td></td>
439 <td><a href="http://www.netbsd.org/Ports/evbmips/">NetBSD/evbmips</a>
440 <br>5Kc (and 4Kc) Malta<br>evaluation boards</td>
441 <td></td>
442 </tr>
443
444 <tr><td height="10"></td></tr>
445
446 <tr>
447 <td></td>
448 <td align="center"><a href="20051007-netbsd-cats-installed.png"><img src="20051007-netbsd-cats-installed_small.png"></a></td>
449 <td></td>
450 <td><a href="http://www.netbsd.org/Ports/cats/">NetBSD/cats</a>
451 <br>CATS</td>
452 <td></td>
453 <td align="center"><a href="20051007-openbsd-cats-installed.png"><img src="20051007-openbsd-cats-installed_small.png"></a></td>
454 <td></td>
455 <td><a href="http://www.openbsd.org/cats.html">OpenBSD/cats</a>
456 <br>CATS</td>
457 <td></td>
458 </tr>
459
460 </table></center>
461
462
463 <p><br>
464
465 <super>*</super> Although Linux runs under DECstation emulation, the
466 default 2.4.27 kernel in Debian GNU/Linux does not support keyboards on
467 the 5000/200 (the specific DECstation model being emulated), so when the
468 login prompt is reached you cannot interact with the system. Kaj-Michael
469 Lang has compiled and made available a newer kernel from the current
470 mips-linux development tree. You can find it here: <a
471 href="http://home.tal.org/~milang/o2/kernels/">http://home.tal.org/~milang/o2/kernels</a>/<a
472 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>
473 This newer kernel supports keyboard input, but it does not have Debian's
474 ethernet patches, so you will not be able to use keyboard/framebuffer
475 <i>and</i> networking at the same time.
476
477
478 </body>
479 </html>

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