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                eCos Host-side Software
 
                =======================
 
 
 
This README file only describes the eCos host-side software. For
 
details of the eCos target-side software or the required toolchains,
 
please see other documentation. A good starting point is
 
http://sources.redhat.com/ecos
 
 
 
There are two categories of host-side software. The host subdirectory
 
contains generic software, primarily related to the eCos configuration
 
technology. All eCos users will need to use some of this technology to
 
configure and build eCos, either using pre-built binaries or by
 
building the host-side software from source. The generic software
 
should be portable to a wide range of host platforms.
 
 
 
There is also package-specific host-side software. Much of this is I/O
 
related. For example the generic USB-slave package contains some
 
programs related to testing; a test application is run on a target
 
with suitable USB slave-side hardware, and needs to interact with
 
another program running on the USB host; the latter is
 
package-specific host-side software and can be found in the
 
subdirectory packages/io/usb/slave. Code like this may have
 
significant platform dependencies and may only work on a single
 
platform or on a small number of platforms. There may also be
 
special requirements, for example it may be necessary to install some
 
programs suid root so that they have appropriate access to the
 
hardware.
 
 
 
 
 
The host subdirectory includes the following:
 
 
 
infra/
 
    This is an implementation of the eCos infrastructure that can be
 
    used on the host-side, and provides assertion, tracing and
 
    testcase support.
 
 
 
    NOTE: the eCos infrastructure facilities are not especially
 
    well-suited to host-side development, in particular they are not
 
    C++-oriented. There are plans to remove the current infrastructure
 
    completely and replace it with something more suitable. People
 
    planning new projects should be aware of this, and may wish to
 
    avoid using the current infrastructure.
 
 
 
libcdl/
 
    The CDL library lies at the heart of the eCos configuration
 
    technology.
 
 
 
tools/configtool/
 
    The sources to the various configuration tools can be found here.
 
 
 
tools/configtool/common/common/
 
    Contains sources related to makefile generation, shared by the
 
    command line and graphical tools.
 
 
 
tools/configtool/standalone/common/
 
    Contains the command line ecosconfig tool.
 
 
 
tools/configtool/standalone/wxwin/
 
    Contains sources for the wxWindows-based, Linux and Windows graphical
 
    configuration tool. The Windows version can currently only be
 
    built with Visual C++, not with cygwin g++.
 
 
 
tools/configtool/common/win32/
 
tools/configtool/standalone/win32/
 
    Contains sources for the older, MFC-based, Windows-only graphical
 
    configuration tool. Again this can currently only be built with
 
    Visual C++.
 
 
 
The two graphical configuration tools have their own build procedures,
 
described in tools/configtool/standalone/wxwin/ReadMe and
 
tools/configtool/standalone/win32/ReadMe respectively.
 
 
 
Package-specific host-side code lives in the host subdirectory of the
 
appropriate package, for example packages/io/usb/slave//host.
 
Most packages only provide target-side code and hence will not have a
 
host subdirectory. Users can install various packages from a variety
 
of sources, and where a package does have host-side software the
 
package documentation should be consulted for further information.
 
 
 
 
 
Installing on Linux, Other Unix Systems, and Cygwin
 
---------------------------------------------------
 
 
 
Both generic host-side software (infra, libcdl and ecosconfig) and
 
package-specific software can be built with the conventional
 
"configure/make/make install" sequence. However the code does not
 
conform fully to GNU coding standards so some operations such as "make
 
dist" are not supported. There is limited support for DejaGnu-based
 
testing.
 
 
 
Much of the host-side software has a dependency on Tcl. This is not
 
supplied with the sources since many users will already have a
 
suitable installation, for example it is shipped as standard with all
 
major Linux distributions. The generic host-side software should work
 
with any release of Tcl from 8.0 onwards. The package-specific
 
software requires a more recent version, 8.3 or later. If no suitable
 
Tcl installation is available then the configure step will still
 
succeed but some of the package-specific software will not be built.
 
 
 
There are two main approaches to building the host-side software:
 
 
 
1) build the generic and the package-specific code in one build tree.
 
   This uses the top-level configure script. The script automatically
 
   invokes the configure script in the main host subdirectory. In
 
   addition it searches the packages hierarchy for host subdirectories
 
   containing their own configure scripts and will invoke those.
 
 
 
   Note: the search for host subdirectories happens during configure
 
   time, not during the make. If new packages with host-side code are
 
   added to the repository then it will be necessary to re-run the
 
   toplevel configure script.
 
 
 
2) build the generic code in one build tree, using the configure
 
   script in the toplevel's host subdirectory. Then build some or all
 
   of the package-specific code in separate build trees, using the
 
   configure scripts in each package's host subdirectory.
 
 
 
The first approach is generally simpler. However some of the
 
package-specific code requires special installation, for example a
 
program may have to be installed suid root so that it has the right
 
privileges to access hardware, and hence the "make install" step has
 
to be run by the superuser. Also some of the package-specific code is
 
rather specialized and may be of no interest to many users. For
 
example, the USB testing code is only useful when developing
 
USB-based applications. Hence some users may prefer the second
 
approach, building just the generic code and a subset of the
 
package-specific code.
 
 
 
It is necessary to use a separate build tree rather than build
 
directly in the source tree. This is enforced by the configure scripts.
 
 
 
  $ mkdir build
 
  $ cd build
 
 
 
The next step is to run the desired configure script. To build all
 
the host-side software this means the toplevel configure script:
 
 
 
  $ /configure 
 
 
 
Alternatively to build just the generic host-side software, use the
 
configure script in the host subdirectory.
 
 
 
  $ mkdir host
 
  $ cd host
 
  $ /host/configure 
 
 
 
Or, to build just one package's host-side code:
 
 
 
  $ mkdir -p packages/io/usb/slave/current/host
 
  $ cd packages/io/usb/slave/current/host
 
  $ /packages/io/usb/slave/current/host/configure 
 
 
 
(It is not actually necessary to use the same directory structure in
 
the build tree as in the source tree, but doing so can avoid
 
confusion).
 
 
 
A list of all the command-line options can be obtained by running
 
"configure --help". The most important ones are as follows:
 
 
 
1) --prefix. This can be used to specify the location of the install
 
   tree, defaulting to /usr/local, so the ecosconfig program ends up
 
   in /usr/local/bin/ecosconfig and the CDL library ends up in
 
   /usr/local/lib/libcdl.a. If an alternative location is preferred
 
   this can be specified with --prefix, for example:
 
 
 
   $ /configure --prefix=/usr/local/ecos 
 
 
 
2) --enable-debug. By default all assertions and tracing are disabled.
 
   When debugging any of the generic host-side software these should
 
   be enabled. Some package-specific code may not have any extra
 
   debug support, in which case --enable-debug would be ignored.
 
 
 
   $ /configure --enable-debug
 
 
 
   It is also possible to control most of the assertion and tracing
 
   macros at a finer grain. This is intended mainly for use by the
 
   developers.
 
 
 
   --disable-asserts        disable all assertions
 
   --disable-preconditions  disable a subset of the assertions
 
   --disable-postconditions disable a subset of the assertions
 
   --disable-invariants     disable a subset of the assertions
 
   --disable-loopinvariants disable a subset of the assertions
 
   --disable-tracing        disable tracing
 
   --disable-fntracing      disable function entry/exit tracing
 
 
 
3) --with-tcl=
 
   --with-tcl-version=
 
 
 
   The host-side tools have a dependency on Tcl, which is not supplied
 
   with the sources because many people will already have a suitable
 
   installation. Specifically it is necessary to have the header file
 
   tcl.h and appropriate libraries such that -ltcl will work - this
 
   can involve either static or shared libraries. Some tools may require
 
   Tk as well as Tcl.
 
 
 
   Unfortunately there is considerable variation in Tcl installations.
 
   In theory all Tcl installations have a file tclConfig.sh which
 
   defines exactly how to compile and link code that uses Tcl, and Tk
 
   has a similar file tkConfig.sh. The eCos configure scripts look for
 
   these files, first in $(prefix)/lib, then in /usr/lib. If the system
 
   already has a Tcl installation in /usr then the configure script will
 
   automatically find /usr/lib/tclConfig.sh and it is not necessary
 
   to pass additional options when configuring the eCos host-side
 
   software. Alternatively, if for example you have installed a more
 
   recent version of Tcl/Tk in the same place that you want to install the
 
   eCos software, e.g. /usr/local, then $(prefix)/lib/tclConfig.sh
 
   will be read in.
 
 
 
   It is also possible that a more recent version of Tcl has been installed
 
   in a different location. For example, you may wish to install the eCos host
 
   tools in /opt/ecos but use a version of Tcl installed in /usr/local. The
 
   eCos configure scripts need to be told explicitly where to look for
 
   the Tcl:
 
 
 
   $ /configure --with-tcl=/usr/local ...
 
 
 
   Some systems, for example Debian Linux 3.0, do not install tclConfig.sh
 
   in /usr/lib because that makes it more difficult to have several different
 
   versions of Tcl installed at the same time. Instead tclConfig.sh is found
 
   in a versioned directory such as /usr/lib/tcl8.3. Since several versions
 
   may be installed the desired one must be specified explicitly.
 
 
 
   $ /configure --with-tcl-version=8.3
 
 
 
   The --with-tcl and --with-tcl-version options are combined to give a search path:
 
 
 
      /lib/tclConfig.sh
 
      /lib/tcl/tclConfig.sh
 
      /lib/tclConfig.sh
 
      /lib/tcl/tclConfig.sh
 
      /usr/lib/tclConfig.sh
 
      /usr/lib/tcl/tclConfig.sh
 
 
 
   If tclConfig.sh cannot be found in any of these places then it is assumed
 
   that Tcl has not been properly installed and the eCos configure script will
 
   fail. The --with-tcl and --with-tcl-version are also used to give a search
 
   path for tkConfig.sh
 
 
 
      /lib/tkConfig.sh
 
      /lib/tk/tkConfig.sh
 
      /lib/tkConfig.sh
 
      /lib/tk/tkConfig.sh
 
      /usr/lib/tkConfig.sh
 
      /usr/lib/tk/tkConfig.sh
 
 
 
   Again, the configure scripts must be able to find tkConfig.sh
 
 
 
   Once tclConfig.sh and tkConfig.sh have been found and read in, the eCos
 
   configure scripts should have all the information needed to compile and
 
   link code that uses Tcl. First the location of key headers such as
 
    is needed. A tclConfig.sh file may define TCL_INC_DIR to give
 
   a specific location, otherwise the header files should be in
 
   $(TCL_PREFIX)/include. If  cannot be found then the eCos configure
 
   scripts will fail.
 
 
 
   Next it is necessary to work out how to link applications with Tcl. This
 
   information should be provided by a tclConfig.sh variable TCL_LIB_SPEC.
 
   Unfortunately not all Tcl installations set this, for example the cygwin
 
   Tcl 8.4 release. If TCL_LIB_SPEC is not defined then instead the
 
   configure script will look for a library libtcl.a, where  is
 
   specified using --with-tcl-version, then for a library libtcl.a
 
 
 
Following the configure step the build tree should be set up
 
correctly. All that remains is the actual build and install:
 
 
 
   $ make
 
   $ make install
 
 
 
This should result in an ecosconfig executable, plus appropriate
 
libraries and header files. If the install prefix is a system
 
location, for example /usr/local/, then "make install" will normally
 
require root privileges. Also some of the package-specific software
 
has special installation requirements, for example programs that need
 
to be installed suid root, and this will also need root privileges.
 
 
 
 
 
Installing with Visual C++
 
--------------------------
 
 
 
Under Windows it is possible to build the generic host-side software
 
(infra, libcdl and ecosconfig) with Visual C++ but this is deprecated.
 
Building with g++ under cygwin is preferred.
 
 
 
It is still necessary to run the configure script and a suitable make
 
utility. That requires a shell and a Unix-like environment, as
 
provided by cygwin. The Visual C++ compiler cl.exe needs to be on the
 
shell's search path, and some environment variables such as INCLUDE
 
and LIB may need to be set to point at the Visual C++ installation -
 
the details may vary depending on the version of the compiler. Then
 
the configure command should be run like this:
 
 
 
  $ CC=cl CXX=cl /host/configure 
 
 
 
Note that the path should be a cygwin path: cygwin mount points are
 
accepted and forward slashes should be used. The various configure
 
scripts now detect that Visual C++ should be used, and adapt
 
accordingly.
 
 
 
Depending on what cygwin mount points are set up, /usr/local may or
 
may not be an appropriate install location for VC++ applications.
 
If not, the install location should be specified with --prefix:
 
 
 
  $ CC=cl CXX=cl /configure --prefix= 
 
 
 
It is also necessary to use the right version of Tcl. For a VC++ build
 
the cygwin release of Tcl should not be used. Instead a suitable
 
prebuilt Tcl package can be obtained from http://www.tcl.tk/.
 
It is necessary to tell the configure script where this has been
 
installed, for example:
 
 
 
  $ CC=cl CXX=cl /configure --prefix= \
 
    --with-tcl=/cygdrive/d/local/scriptics/Tcl/tcl8.1 
 
 
 
The library name will be of the form tcl81.lib, and there will not be
 
a symbolic link from tcl.lib to the appropriate version. It will be
 
necessary to specify the Tcl version explicitly since the default
 
version is currently 8.0.
 
 
 
  $ CC=cl CXX=cl /configure --prefix= \
 
    --with-tcl=/d/local/scriptics/Tcl/tcl8.1 --with-tcl-version=81 
 
 
 
Following a successful configure, the tools can be built and installed
 
in the normal fashion:
 
 
 
  $ make
 
  $ make install
 
 
 
 
 
More Information
 
================
 
 
 
Please see the eCos web site, http://sources.redhat.com/ecos/, for
 
further details. This includes the FAQ, a form for reporting problems,
 
and details of the various mailing lists
 
(http://sources.redhat.com/ecos/intouch.html) At the time of writing
 
there are no separate mailing lists for the eCos host-side sources,
 
the main mailing list ecos-discuss@sources.redhat.com should be used
 
instead.
 
 
 
//####COPYRIGHTBEGIN####
 
//
 
//----------------------------------------------------------------------------
 
// Copyright (C) 2002 Bart Veer
 
// Copyright (C) 2000, 2001 Red Hat, Inc.
 
//
 
// This file is part of the eCos host tools.
 
//
 
// This program is free software; you can redistribute it and/or modify it
 
// under the terms of the GNU General Public License as published by the Free
 
// Software Foundation; either version 2 of the License, or (at your option)
 
// any later version.
 
//
 
// This program is distributed in the hope that it will be useful, but WITHOUT
 
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 
// more details.
 
//
 
// You should have received a copy of the GNU General Public License along with
 
// this program; if not, write to the Free Software Foundation, Inc.,
 
// 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
//
 
// ----------------------------------------------------------------------------
 
//
 
//####COPYRIGHTEND####

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