/[gxemul]/trunk/doc/intro.html
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
ViewVC logotype

Contents of /trunk/doc/intro.html

Parent Directory Parent Directory | Revision Log Revision Log


Revision 20 - (show annotations)
Mon Oct 8 16:19:23 2007 UTC (13 years, 3 months ago) by dpavlin
File MIME type: text/html
File size: 17906 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1055 2005/11/25 22:48:36 debug Exp $
20051031	Adding disassembly support for more ARM instructions (clz,
		smul* etc), and adding a hack to support "new tiny" pages
		for StrongARM.
20051101	Minor documentation updates (NetBSD 2.0.2 -> 2.1, and OpenBSD
		3.7 -> 3.8, and lots of testing).
		Changing from 1-sector PIO mode 0 transfers to 128-sector PIO
		mode 3 (in dev_wdc).
		Various minor ARM dyntrans updates (pc-relative loads from
		within the same page as the instruction are now treated as
		constant "mov").
20051102	Re-enabling instruction combinations (they were accidentally
		disabled).
		Dyntrans TLB entries are now overwritten using a round-robin
		scheme instead of randomly. This increases performance.
		Fixing a typo in file.c (thanks to Chuan-Hua Chang for
		noticing it).
		Experimenting with adding ATAPI support to dev_wdc (to make
		emulated *BSD detect cdroms as cdroms, not harddisks).
20051104	Various minor updates.
20051105	Continuing on the ATAPI emulation. Seems to work well enough
		for a NetBSD/cats installation, but not OpenBSD/cats.
		Various other updates.
20051106	Modifying the -Y command line option to allow scaleup with
		certain graphic controllers (only dev_vga so far), not just
		scaledown.
		Some minor dyntrans cleanups.
20051107	Beginning a cleanup up the PCI subsystem (removing the
		read_register hack, etc).
20051108	Continuing the cleanup; splitting up some pci devices into a
		normal autodev device and some separate pci glue code.
20051109	Continuing on the PCI bus stuff; all old pci_*.c have been
		incorporated into normal devices and/or rewritten as glue code
		only, adding a dummy Intel 82371AB PIIX4 for Malta (not really
		tested yet).
		Minor pckbc fix so that Linux doesn't complain.
		Working on the DEC 21143 NIC (ethernet mac rom stuff mostly).
		Various other minor fixes.
20051110	Some more ARM dyntrans fine-tuning (e.g. some instruction
		combinations (cmps followed by conditional branch within the
		same page) and special cases for DPIs with regform when the
		shifter isn't used).
20051111	ARM dyntrans updates: O(n)->O(1) for just-mark-as-non-
		writable in the generic pc_to_pointers function, and some other
		minor hacks.
		Merging Cobalt and evbmips (Malta) ISA interrupt handling,
		and some minor fixes to allow Linux to accept harddisk irqs.
20051112	Minor device updates (pckbc, dec21143, lpt, ...), most
		importantly fixing the ALI M1543/M5229 so that harddisk irqs
		work with Linux/CATS.
20051113	Some more generalizations of the PCI subsystem.
		Finally took the time to add a hack for SCSI CDROM TOCs; this
		enables OpenBSD to use partition 'a' (as needed by the OpenBSD
		installer), and Windows NT's installer to get a bit further.
		Also fixing dev_wdc to allow Linux to detect ATAPI CDROMs.
		Continuing on the DEC 21143.
20051114	Minor ARM dyntrans tweaks; ARM cmps+branch optimization when
		comparing with 0, and generalizing the xchg instr. comb.
		Adding disassembly of ARM mrrc/mcrr and q{,d}{add,sub}.
20051115	Continuing on various PPC things (BATs, other address trans-
		lation things, various loads/stores, BeBox emulation, etc.).
		Beginning to work on PPC interrupt/exception support.
20051116	Factoring out some code which initializes legacy ISA devices
		from those machines that use them (bus_isa).
		Continuing on PPC interrupt/exception support.
20051117	Minor Malta fixes: RTC year offset = 80, disabling a speed hack
		which caused NetBSD to detect a too fast cpu, and adding a new
		hack to make Linux detect a faster cpu.
		Continuing on the Artesyn PM/PPC emulation mode.
		Adding an Algor emulation skeleton (P4032 and P5064);
		implementing some of the basics.
		Continuing on PPC emulation in general; usage of unimplemented
		SPRs is now easier to track, continuing on memory/exception
		related issues, etc.
20051118	More work on PPC emulation (tgpr0..3, exception handling,
		memory stuff, syscalls, etc.).
20051119	Changing the ARM dyntrans code to mostly use cpu->pc, and not
		necessarily use arm reg 15. Seems to work.
		Various PPC updates; continuing on the PReP emulation mode.
20051120	Adding a workaround/hack to dev_mc146818 to allow NetBSD/prep
		to detect the clock.
20051121	More cleanup of the PCI bus (memory and I/O bases, etc).
		Continuing on various PPC things (decrementer and timebase,
		WDCs on obio (on PReP) use irq 13, not 14/15).
20051122	Continuing on the CPC700 controller (interrupts etc) for PMPPC,
		and on PPC stuff in general.
		Finally! After some bug fixes to the virtual to physical addr
		translation, NetBSD/{prep,pmppc} 2.1 reach userland and are
		stable enough to be interacted with.
		More PCI updates; reverse-endian device access for PowerPC etc.
20051123	Generalizing the IEEE floating point subsystem (moving it out
		from src/cpus/cpu_mips_coproc.c into a new src/float_emul.c).
		Input via slave xterms was sometimes not really working; fixing
		this for ns16550, and a warning message is now displayed if
		multiple non-xterm consoles are active.
		Adding some PPC floating point support, etc.
		Various interrupt related updates (dev_wdc, _ns16550, _8259,
		and the isa32 common code in machine.c).
		NetBSD/prep can now be installed! :-) (Well, with some manual
		commands necessary before running sysinst.) Updating the
		documentation and various other things to reflect this.
20051124	Various minor documentation updates.
		Continuing the work on the DEC 21143 NIC.
20051125	LOTS of work on the 21143. Both OpenBSD and NetBSD work fine
		with it now, except that OpenBSD sometimes gives a time-out
		warning.
		Minor documentation updates.

==============  RELEASE 0.3.7  ==============


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 1.66 2005/11/23 22:03:24 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 such as ARM and PowerPC are also partially emulated.
74
75 <p>Devices and CPUs are not simulated with 100% accuracy. They are only
76 ``faked'' well enough to allow guest operating systems 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 third-party libraries
82 (except X11, but that is optional), and should compile and run on most
83 Unix-like systems.
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 an AMD Athlon
163 host, you might want to try setting <tt>CFLAGS</tt> to <tt>-march=athlon
164 -O3</tt> before running <tt>configure</tt>.
165
166
167
168
169
170
171
172 <p><br>
173 <a name="run"></a>
174 <h3>How to run the emulator:</h3>
175
176 Once you have built GXemul, running it should be rather straight-forward.
177 Running <tt><b>gxemul</b></tt> without arguments (or with the
178 <b><tt>-h</tt></b> or <b><tt>-H</tt></b> command line options) will
179 display a help message.
180
181 <p>
182 To get some ideas about what is possible to run in the emulator, please
183 read the section about <a href="guestoses.html">installing "guest"
184 operating systems</a>. If you are interested in using the emulator to
185 develop code on your own, then you should also read the section about
186 <a href="experiments.html#hello">Hello World</a>.
187
188 <p>
189 To exit the emulator, type CTRL-C to enter the
190 single-step debugger, and then type <tt><b>quit</b></tt>.
191
192 <p>
193 If you are starting an emulation by entering settings directly on the
194 command line, and you are not using the <tt><b>-x</b></tt> option, then all
195 terminal input and output will go to the main controlling terminal.
196 CTRL-C is used to break into the debugger, so in order to send CTRL-C to
197 the running (emulated) program, you may use CTRL-B.
198 (This should be a reasonable compromise to allow the emulator to be usable
199 even on systems without X Windows.)
200
201 <p>
202 There is no way to send an actual CTRL-B to the emulated program, when
203 typing in the main controlling terminal window. The solution is to either
204 use <a href="configfiles.html">configuration files</a>, or use
205 <tt><b>-x</b></tt>. Both these solutions cause new xterms to be opened for
206 each emulated serial port that is written to. CTRL-B and CTRL-C both have
207 their original meaning in those xterm windows.
208
209
210
211
212
213 <p><br>
214 <a name="cpus"></a>
215 <h3>Which CPU types does GXemul emulate?</h3>
216
217 <h4>MIPS:</h4>
218
219 Emulation of R4000, which is a 64-bit CPU, was my initial goal.
220 R2000/R3000-like CPUs (32-bit), R1x000, and generic MIPS32/MIPS64-style
221 CPUs are also emulated, and are hopefully almost as stable as the R4000
222 emulation. Several guest operating systems for MIPS can run inside
223 the emulator.
224
225 <p>(For MIPS emulation, I have written an experimental dynamic binary
226 translation subsystem, for Alpha and i386 hosts. This gives higher total
227 performance than interpreting one instruction at a time and executing it.
228 If you wish to disable bintrans, add <b>-B</b> to the command line.)
229
230 <h4>ARM:</h4>
231
232 ARM emulation is good enough to run NetBSD/cats 2.1 and OpenBSD/cats 3.8,
233 but it is not as tested or fine-tuned as the MIPS emulation mode.
234
235 <h4>PowerPC:</h4>
236
237 PowerPC emulation is still in its beginning stages, but good enough
238 to run NetBSD/prep 2.1.
239
240 <p>Non-MIPS emulation modes use dynamic translation, but not recompilation
241 into native code. This makes it possible to run on any host platform.
242
243
244
245
246
247 <p><br>
248 <a name="accuracy"></a>
249 <h3>Emulation accuracy:</h3>
250
251 GXemul is an instruction-level emulator; things that would happen in
252 several steps within a real CPU are not taken into account (eg. pipe-line
253 stalls or out-of-order execution). Still, instruction-level accuracy seems
254 to be enough to be able to run complete guest operating systems inside the
255 emulator.
256
257 <p>Caches are by default not emulated. In some cases, the existance of
258 caches is "faked" to let operating systems think that they are there.
259 (There is some old code for R2000/R3000 caches, but it has probably
260 suffered from bitrot by now.)
261
262 <p>The emulator is <i>not</i> timing-accurate. It can be run in a
263 "deterministic" mode, <tt><b>-D</b></tt>. The meaning of deterministic is
264 simply that running two emulations with the same settings will result in
265 identical runs. Obviously, this requires that no user interaction is
266 taking place, and that clock speeds are fixed with the <tt><b>-I</b></tt>
267 option. (Deterministic in this case does <i>not</i> mean that the
268 emulation will be identical to some actual real-world machine.)
269
270 <p><font color="#ff0000">(Oops/TODO: User interaction means <i>both</i>
271 input to the emulated program/OS, and interacting with the emulator
272 itself. Breaking into the debugger and then continuing execution may
273 affect when/how interrupts occur.)</font>
274
275
276
277
278
279
280 <p><br>
281 <a name="emulmodes"></a>
282 <h3>Which machines does GXemul emulate?</h3>
283
284 A few different machine types are emulated. The following machine types
285 are emulated well enough to run at least one "guest OS":
286
287 <p>
288 <ul>
289 <li><b><u>MIPS</u></b>
290 <ul>
291 <li><b>DECstation 5000/200</b>&nbsp;&nbsp;("3max")
292 <p>
293 <li><b>Acer Pica-61</b>&nbsp;&nbsp;(an ARC machine)
294 <p>
295 <li><b>NEC MobilePro 770, 780, 800, and 880</b>&nbsp;&nbsp;(HPCmips machines)
296 <p>
297 <li><b>Cobalt</b>
298 <p>
299 <li><b>Malta</b> (evbmips)
300 <p>
301 <li><b>SGI O2 ("IP32")</b>
302 <br><small>(Enough for root-on-nfs, but not for disk boot.)</small>
303 </ul>
304 <p>
305 <li><b><u>ARM</u></b>
306 <ul>
307 <li><b>CATS</b>
308 </ul>
309 <p>
310 <li><b><u>PowerPC</u></b>
311 <ul>
312 <li><b>PReP (PowerPC Reference Platform)</b>
313 </ul>
314 </ul>
315
316 <p>There is code in GXemul for emulation of many other machine types; the
317 degree to which these work range from almost being able to run a complete
318 OS, to almost completely unsupported (perhaps just enough support to
319 output a few boot messages via serial console).
320
321 <p>In addition to emulating real machines, there is also a "test-machine".
322 A test-machine consists of one or more CPUs and a few experimental devices
323 such as:
324
325 <p>
326 <ul>
327 <li>a console I/O device (putchar() and getchar()...)
328 <li>an inter-processor communication device, for SMP experiments
329 <li>a very simple linear framebuffer device (for graphics output)
330 <li>a simple SCSI disk controller
331 <li>a simple ethernet controller
332 </ul>
333
334 <p>This mode is useful if you wish to run experimental code, but do not
335 wish to target any specific real-world machine type, for example for
336 educational purposes.
337
338 <p>You can read more about these experimental devices <a
339 href="experiments.html#expdevices">here</a>.
340
341
342
343
344
345
346
347 <p><br>
348 <a name="guestos"></a>
349 <h3>Which guest OSes are possible to run in GXemul?</h3>
350
351 This table lists the guest OSes that run well enough to be considered
352 working in the emulator. They can boot from a harddisk image and be
353 interacted with similar to a real machine.
354
355 <p>
356 <center><table border="0">
357 <tr>
358 <td width="10"></td>
359 <td align="center"><a href="20050317-example.png"><img src="20050317-example_small.png"></a></td>
360 <td width="15"></td>
361 <td><a href="http://www.netbsd.org/Ports/pmax/">NetBSD/pmax</a>
362 <br>DECstation 5000/200</td>
363 <td width="30"></td>
364 <td align="center"><a href="20041024-netbsd-arc-installed.gif"><img src="20041024-netbsd-arc-installed_small.gif"></a></td>
365 <td width="15"></td>
366 <td><a href="http://www.netbsd.org/Ports/arc/">NetBSD/arc</a>
367 <br>Acer Pica-61</td>
368
369 </tr>
370
371 <tr><td height="10"></td></tr>
372
373 <tr>
374 <td></td>
375 <td align="center"><a href="openbsd-pmax-20040710.png"><img src="openbsd-pmax-20040710_small.png"></a></td>
376 <td></td>
377 <td><a href="http://www.openbsd.org/pmax.html">OpenBSD/pmax</a>
378 <br>DECstation 5000/200</td>
379 <td></td>
380 <td align="center"><a href="20041024-openbsd-arc-installed.gif"><img src="20041024-openbsd-arc-installed_small.gif"></a></td>
381 <td></td>
382 <td><a href="http://www.openbsd.org/arc.html">OpenBSD/arc</a>
383 <br>Acer Pica-61</td>
384 </tr>
385
386 <tr><td height="10"></td></tr>
387
388 <tr>
389 <td></td>
390 <td align="center"><a href="ultrix4.5-20040706.png"><img src="ultrix4.5-20040706_small.gif"></a></td>
391 <td></td>
392 <td>Ultrix/RISC<br>DECstation 5000/200</td>
393 <td></td>
394 <td align="center"><a href="20041213-debian_4.png"><img src="20041213-debian_4_small.gif"></a></td>
395 <td></td>
396 <td><a href="http://www.debian.org/">Debian&nbsp;GNU/Linux</a>&nbsp;<super>*</super>
397 <br>DECstation 5000/200</td>
398 </tr>
399
400 <tr><td height="10"></td></tr>
401
402 <tr>
403 <td></td>
404 <td align="center"><a href="sprite-20040711.png"><img src="sprite-20040711_small.png"></a></td>
405 <td></td>
406 <td><a href="http://www.cs.berkeley.edu/projects/sprite/retrospective.html">Sprite</a>
407 <br>DECstation 5000/200</td>
408 <td></td>
409 <td align="center"><a href="20041129-redhat_mips.png"><img src="20041129-redhat_mips_small.png"></a></td>
410 <td></td>
411 <td>Redhat&nbsp;Linux&nbsp;<super>*</super>
412 <br>DECstation 5000/200</td>
413 </tr>
414
415 <tr><td height="10"></td></tr>
416
417 <tr>
418 <td></td>
419 <td align="center"><a href="20050427-netbsd-hpcmips-2.png"><img src="20050427-netbsd-hpcmips-2_small.png"></a></td>
420 <td></td>
421 <td><a href="http://www.netbsd.org/Ports/hpcmips/">NetBSD/hpcmips</a>
422 <br>NEC MobilePro 770, 780, 800, 880</td>
423 <td></td>
424 <td align="center"><a href="20050413-netbsd-cobalt.png"><img src="20050413-netbsd-cobalt_small.png"></a></td>
425 <td></td>
426 <td><a href="http://www.netbsd.org/Ports/cobalt/">NetBSD/cobalt</a>
427 <br>Cobalt</td>
428 </tr>
429
430 <tr><td height="10"></td></tr>
431
432 <tr>
433 <td></td>
434 <td align="center"><a href="20050626-netbsd-sgimips-netboot.png"><img src="20050626-netbsd-sgimips-netboot_small.png"></a></td>
435 <td></td>
436 <td><a href="http://www.netbsd.org/Ports/sgimips/">NetBSD/sgimips</a>
437 <br>SGI O2 ("IP32")</td>
438 <td></td>
439 <td align="center"><a href="20050622-netbsd-evbmips-malta.png"><img src="20050622-netbsd-evbmips-malta_small.png"></a></td>
440 <td></td>
441 <td><a href="http://www.netbsd.org/Ports/evbmips/">NetBSD/evbmips</a>
442 <br>5Kc (and 4Kc) Malta<br>evaluation boards</td>
443 <td></td>
444 </tr>
445
446 <tr><td height="10"></td></tr>
447
448 <tr>
449 <td></td>
450 <td align="center"><a href="20051007-netbsd-cats-installed.png"><img src="20051007-netbsd-cats-installed_small.png"></a></td>
451 <td></td>
452 <td><a href="http://www.netbsd.org/Ports/cats/">NetBSD/cats</a>
453 <br>CATS</td>
454 <td></td>
455 <td align="center"><a href="20051007-openbsd-cats-installed.png"><img src="20051007-openbsd-cats-installed_small.png"></a></td>
456 <td></td>
457 <td><a href="http://www.openbsd.org/cats.html">OpenBSD/cats</a>
458 <br>CATS</td>
459 <td></td>
460 </tr>
461
462 <tr><td height="10"></td></tr>
463
464 <tr>
465 <td></td>
466 <td align="center"><a href="20051123-netbsd-prep.png"><img src="20051123-netbsd-prep_small.png"></a></td>
467 <td></td>
468 <td><a href="http://www.netbsd.org/Ports/prep/">NetBSD/prep</a>
469 <br>PReP</td>
470 <td></td>
471 </tr>
472
473 </table></center>
474
475
476 <p><br>
477
478 <super>*</super> Although Linux runs under DECstation emulation, the
479 default 2.4.27 kernel in Debian GNU/Linux does not support keyboards on
480 the 5000/200 (the specific DECstation model being emulated), so when the
481 login prompt is reached you cannot interact with the system. Kaj-Michael
482 Lang has compiled and made available a newer kernel from the current
483 mips-linux development tree. You can find it here: <a
484 href="http://home.tal.org/~milang/o2/kernels/">http://home.tal.org/~milang/o2/kernels</a>/<a
485 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>
486 This newer kernel supports keyboard input, but it does not have Debian's
487 ethernet patches, so you will not be able to use keyboard/framebuffer
488 <i>and</i> networking at the same time.
489
490
491 </body>
492 </html>

  ViewVC Help
Powered by ViewVC 1.1.26