Added section on ddd.

doc/FAQ/freesw.t

@@ -37,7 +37,91 @@ compiler (GNAT) is available and has excellent support for RTEMS.
 
 @subsection DDD
 
-XXX insert information from Charles Gauthier and Jiri Gaisler
+By far the easiest way to use DDD if you are on a Redhat Linux system is
+to retrieve the latest RPM package. I got mine from
+ftp://ftp.crc.ca/systems/linux/redhat/contrib.redhat.com/libc6/i386/ddd-dynamic-
+3.1.5-1.i386.rpm.
+This particular one is for Redhat 6.0 on i386. For 5.2, I guess you
+should use libc5 instead of libc6.
+
+You also need Lesstif 0.88. I got mine from
+ftp://ftp.hungry.com/pub/hungry/lesstif/bindist/lesstif-0.88.1-1.i386.rpm
+
+Installed as RPMs, DDD and Lesstif work out-of-the-box.
+
+Both Lesstif and DDD can be built from scratch without any problems.
+
+The isntruction on how to install Lesstif are at
+http://www.cs.tu-bs.de/softech/ddd/.  They indicate that
+
+@itemize @bullet
+LessTif should be used in (default) Motif 1.2 compatibility mode.
+
+The Motif 2.0 compatibility mode of LessTif is still incomplete.
+@end itemize
+
+So configure lesstif with --enable-default-12.
+
+The configure script is broken (see  www.lesstif.org --> known problems)
+for 0.88.1. I didn't fix the script as they show, so I just have links
+in /usr/local/lib (also shown).
+
+Watch out: Lesstif installs its libraries in /usr/local/Lesstif. You
+will need to update /etc/ld.so.conf and regenerate the cache of shared
+library paths to point to the Motif 1.2 library.
+
+The student configure DDD --with-motif-libraries=/usr/local/lib
+--with-motif-includes=/usr/local/include
+
+You will need gnuplot 3.7. I got mine from
+ftp://ftp.dartmouth.edu/pub/gnuplot/gnuplot-3.7.tar.gz. Build and
+install from scratch.
+
+I start DDD from a script in $HOME/bin:
+
+@example
+#!/bin/bash
+ddd --debugger m68k-elf-gdb $1
+@end example
+
+
+Now for the hard part:
+
+under RH Linux, to get gdb to use the serial ports while running as a
+mere mortal, edit /etc/security/console.perms, and create a <serial>
+class (call it whatever you want).
+
+@example
+<serial>=/dev/ttyS* /dev/cua*
+@end example
+
+Now enable the change of ownership of these devices when users log in
+from the console:
+
+@example
+<console> 0600 <serial> 0600 root
+@end example
+
+And voila!
+
+I use minicom to communicate with the target to initiate a TFTP
+download. I then suspend minicom,  lauch DDD, and begin debugging.
+
+The procedure should be the same on other platforms, modulo the choice
+of terminal emulator program and the scheme used to access the serial
+ports. From the cygwin mailing list, I have the impression that GDB has
+some problems communicating over serial lines on that platform.
+
+P.S. GDB doesn't like getting lots of input from the program under test
+over the serial line. Actually, it doesn't care, but it looses
+characters. It would appear that flow control is not re-enabled when it
+resumes program execution. At times, it looked like the test were
+failing, but everything was OK. We modified the MVME167 serial driver to
+send test output to another serial port.
+
+Information provided by Charles-Antoine Gauthier (charles.gauthier@@iit.nrc.ca)
+and Jiri Gaisler (jgais@@ws.estec.esa.nl).
+
 
 @section omniORB