mirror of
https://git.rtems.org/rtems-docs/
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391 lines
19 KiB
ReStructuredText
391 lines
19 KiB
ReStructuredText
.. SPDX-License-Identifier: CC-BY-SA-4.0
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.. Copyright (C) 2016 Chris Johns <chrisj@rtems.org>
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.. _rtems-kernel:
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RTEMS Kernel
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============
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RTEMS is an open source real-time operating system. As a user you have access
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to all the source code. The ``RTEMS Kernel`` section will show you how you
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build the RTEMS kernel on your host.
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Development Sources
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-------------------
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Create a new location to build the RTEMS kernel:
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.. code-block:: none
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$ cd
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$ cd development/rtems
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$ mkdir kernel
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$ cd kernel
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Clone the RTEMS respository:
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.. code-block:: none
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$ git clone git://git.rtems.org/rtems.git rtems
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Cloning into 'rtems'...
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remote: Counting objects: 483342, done.
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remote: Compressing objects: 100% (88974/88974), done.
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remote: Total 483342 (delta 390053), reused 475669 (delta 383809)
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Receiving objects: 100% (483342/483342), 69.88 MiB | 1.37 MiB/s, done.
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Resolving deltas: 100% (390053/390053), done.
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Checking connectivity... done.
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Tools Path Set Up
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-----------------
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We need to set our path to include the RTEMS tools we built in the previous
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section. The RTEMS tools needs to be first in your path because RTEMS provides
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specific versions of the ``autoconf`` and ``automake`` tools. We want to use
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the RTEMS version and not your host's versions:
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.. code-block:: none
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$ export PATH=$HOME/development/rtems/5/bin:$PATH
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.. _bootstrapping:
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Bootstrapping
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-------------
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The developers version of the code from git requires we ``bootstrap`` the
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source code. This is an ``autoconf`` and ``automake`` bootstrap to create the
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various files generated by ``autoconf`` and ``automake``. RTEMS does not keep
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these generated files under version control. The bootstrap process is slow so
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to speed it up the RSB provides a command that can perform the bootstrap in
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parallel using your available cores. We need to enter the cloned source
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directory then run the bootstrap commands:
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.. code-block:: none
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$ cd rtems
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$ ./bootstrap -c && $HOME/development/rtems/rsb/source-builder/sb-bootstrap
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removing automake generated Makefile.in files
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removing configure files
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removing aclocal.m4 files
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RTEMS Source Builder - RTEMS Bootstrap, 5 (089327b5dcf9)
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1/139: autoreconf: configure.ac
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2/139: autoreconf: cpukit/configure.ac
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3/139: autoreconf: tools/cpu/configure.ac
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4/139: autoreconf: tools/cpu/generic/configure.ac
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5/139: autoreconf: tools/cpu/sh/configure.ac
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6/139: autoreconf: tools/cpu/nios2/configure.ac
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7/139: autoreconf: tools/build/configure.ac
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8/139: autoreconf: doc/configure.ac
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......
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124/139: autoreconf: c/src/make/configure.ac
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125/139: autoreconf: c/src/librtems++/configure.ac
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126/139: autoreconf: c/src/ada-tests/configure.ac
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127/139: autoreconf: testsuites/configure.ac
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128/139: autoreconf: testsuites/libtests/configure.ac
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129/139: autoreconf: testsuites/mptests/configure.ac
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130/139: autoreconf: testsuites/fstests/configure.ac
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131/139: autoreconf: testsuites/sptests/configure.ac
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132/139: autoreconf: testsuites/tmtests/configure.ac
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133/139: autoreconf: testsuites/smptests/configure.ac
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134/139: autoreconf: testsuites/tools/configure.ac
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135/139: autoreconf: testsuites/tools/generic/configure.ac
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136/139: autoreconf: testsuites/psxtests/configure.ac
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137/139: autoreconf: testsuites/psxtmtests/configure.ac
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138/139: autoreconf: testsuites/rhealstone/configure.ac
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139/139: autoreconf: testsuites/samples/configure.ac
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Bootstrap time: 0:02:47.398824
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Building a BSP
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--------------
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We build RTEMS in a directory outside of the source tree we have just cloned
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and ``bootstrapped``. You cannot build RTEMS while in the source tree. Lets
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create a suitable directory using the name of the BSP we are going to build:
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.. code-block:: none
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$ cd ..
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$ mkdir erc32
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$ cd erc32
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Configure RTEMS using the ``configure`` command. We use a full path to
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``configure`` so the object files built contain the absolute path of the source
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files. If you are source level debugging you will be able to access the source
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code to RTEMS from the debugger. We will build for the ``erc32`` BSP with POSIX
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enabled and the networking stack disabled:
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.. code-block:: none
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$ $HOME/development/rtems/kernel/rtems/configure --prefix=$HOME/development/rtems/5 \
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--target=sparc-rtems5 --enable-rtemsbsp=erc32 --enable-posix \
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--disable-networking
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checking for gmake... no
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checking for make... make
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checking for RTEMS Version... 4.11.99.0
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checking build system type... x86_64-pc-linux-gnu
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checking host system type... x86_64-pc-linux-gnu
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checking target system type... sparc-unknown-rtems5
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checking for a BSD-compatible install... /usr/bin/install -c
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checking whether build environment is sane... yes
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checking for a thread-safe mkdir -p... /bin/mkdir -p
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checking for gawk... no
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checking for mawk... mawk
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checking whether make sets $(MAKE)... yes
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checking whether to enable maintainer-specific portions of Makefiles... no
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checking that generated files are newer than configure... done
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......
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checking target system type... sparc-unknown-rtems5
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checking rtems target cpu... sparc
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checking for a BSD-compatible install... /usr/bin/install -c
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checking whether build environment is sane... yes
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checking for sparc-rtems5-strip... sparc-rtems5-strip
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checking for a thread-safe mkdir -p... /bin/mkdir -p
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checking for gawk... no
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checking for mawk... mawk
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checking whether make sets $(MAKE)... yes
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checking whether to enable maintainer-specific portions of Makefiles... no
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checking that generated files are newer than configure... done
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configure: creating ./config.status
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config.status: creating Makefile
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target architecture: sparc.
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available BSPs: erc32.
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'make all' will build the following BSPs: erc32.
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other BSPs can be built with 'make RTEMS_BSP="bsp1 bsp2 ..."'
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config.status: creating Makefile
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Build RTEMS using two cores:
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.. code-block:: none
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$ make -j 2
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Making all in tools/build
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make[1]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/build'
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make all-am
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/build'
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gcc -DHAVE_CONFIG_H -I. -I/home/chris/development/rtems/kernel/rtems/tools/build -g -O2 -MT cklength.o -MD -MP -MF .deps/cklength.Tpo -c -o cklength.o /home/chris/development/rtems/kernel/rtems/tools/build/cklength.c
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gcc -DHAVE_CONFIG_H -I. -I/home/chris/development/rtems/kernel/rtems/tools/build -g -O2 -MT eolstrip.o -MD -MP -MF .deps/eolstrip.Tpo -c -o eolstrip.o /home/chris/development/rtems/kernel/rtems/tools/build/eolstrip.c
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mv -f .deps/cklength.Tpo .deps/cklength.Po
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mv -f .deps/eolstrip.Tpo .deps/eolstrip.Po
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gcc -DHAVE_CONFIG_H -I. -I/home/chris/development/rtems/kernel/rtems/tools/build -g -O2 -MT compat.o -MD -MP -MF .deps/compat.Tpo -c -o compat.o /home/chris/development/rtems/kernel/rtems/tools/build/compat.c
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gcc -DHAVE_CONFIG_H -I. -I/home/chris/development/rtems/kernel/rtems/tools/build -g -O2 -MT packhex.o -MD -MP -MF .deps/packhex.Tpo -c -o packhex.o /home/chris/development/rtems/kernel/rtems/tools/build/packhex.c
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mv -f .deps/compat.Tpo .deps/compat.Po
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gcc -DHAVE_CONFIG_H -I. -I/home/chris/development/rtems/kernel/rtems/tools/build -g -O2 -MT unhex.o -MD -MP -MF .deps/unhex.Tpo -c -o unhex.o /home/chris/development/rtems/kernel/rtems/tools/build/unhex.c
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mv -f .deps/packhex.Tpo .deps/packhex.Po
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gcc -DHAVE_CONFIG_H -I. -I/home/chris/development/rtems/kernel/rtems/tools/build -g -O2 -MT rtems-bin2c.o -MD -MP -MF .deps/rtems-bin2c.Tpo -c -o rtems-bin2c.o /home/chris/development/rtems/kernel/rtems/tools/build/rtems-bin2c.c
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mv -f .deps/unhex.Tpo .deps/unhex.Po
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gcc -DHAVE_CONFIG_H -I. -I/home/chris/development/rtems/kernel/rtems/tools/build -g -O2 -MT binpatch.o -MD -MP -MF .deps/binpatch.Tpo -c -o binpatch.o /home/chris/development/rtems/kernel/rtems/tools/build/binpatch.c
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mv -f .deps/rtems-bin2c.Tpo .deps/rtems-bin2c.Po
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gcc -g -O2 -o cklength cklength.o
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mv -f .deps/binpatch.Tpo .deps/binpatch.Po
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gcc -g -O2 -o eolstrip eolstrip.o compat.o
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gcc -g -O2 -o packhex packhex.o
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gcc -g -O2 -o rtems-bin2c rtems-bin2c.o compat.o
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gcc -g -O2 -o unhex unhex.o compat.o
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gcc -g -O2 -o binpatch binpatch.o
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/build'
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make[1]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/build'
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Making all in tools/cpu
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make[1]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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Making all in generic
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/cpu/generic'
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make[2]: Nothing to be done for 'all'.
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/cpu/generic'
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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make[2]: Nothing to be done for 'all-am'.
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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make[1]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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Making all in testsuites/tools
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make[1]: Entering directory '/home/chris/development/rtems/kernel/erc32/testsuites/tools'
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Making all in generic
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32/testsuites/tools/generic'
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make[2]: Nothing to be done for 'all'.
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32/testsuites/tools/generic'
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32/testsuites/tools'
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make[2]: Nothing to be done for 'all-am'.
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32/testsuites/tools'
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make[1]: Leaving directory '/home/chris/development/rtems/kernel/erc32/testsuites/tools'
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Making all in sparc-rtems5/c
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make[1]: Entering directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/c'
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Making all in .
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/c'
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Configuring RTEMS_BSP=erc32
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checking for gmake... no
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checking for make... make
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checking build system type... x86_64-pc-linux-gnu
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checking host system type... sparc-unknown-rtems5
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......
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sparc-rtems5-gcc -B../../../../../erc32/lib/ -specs bsp_specs -qrtems -DHAVE_CONFIG_H -I. -I/home/chris/development/rtems/kernel/rtems/c/src/../../testsuites/samples/nsecs -I.. -I/home/chris/development/rtems/kernel/rtems/c/src/../../testsuites/samples/../support/include -mcpu=cypress -O2 -g -ffunction-sections -fdata-sections -Wall -Wmissing-prototypes -Wimplicit-function-declaration -Wstrict-prototypes -Wnested-externs -MT init.o -MD -MP -MF .deps/init.Tpo -c -o init.o /home/chris/development/rtems/kernel/rtems/c/src/../../testsuites/samples/nsecs/init.c
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sparc-rtems5-gcc -B../../../../../erc32/lib/ -specs bsp_specs -qrtems -DHAVE_CONFIG_H -I. -I/home/chris/development/rtems/kernel/rtems/c/src/../../testsuites/samples/nsecs -I.. -I/home/chris/development/rtems/kernel/rtems/c/src/../../testsuites/samples/../support/include -mcpu=cypress -O2 -g -ffunction-sections -fdata-sections -Wall -Wmissing-prototypes -Wimplicit-function-declaration -Wstrict-prototypes -Wnested-externs -MT empty.o -MD -MP -MF .deps/empty.Tpo -c -o empty.o /home/chris/development/rtems/kernel/rtems/c/src/../../testsuites/samples/nsecs/empty.c
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mv -f .deps/empty.Tpo .deps/empty.Po
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mv -f .deps/init.Tpo .deps/init.Po
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sparc-rtems5-gcc -B../../../../../erc32/lib/ -specs bsp_specs -qrtems -mcpu=cypress -O2 -g -ffunction-sections -fdata-sections -Wall -Wmissing-prototypes -Wimplicit-function-declaration -Wstrict-prototypes -Wnested-externs -Wl,--gc-sections -mcpu=cypress -o nsecs.exe init.o empty.o
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sparc-rtems5-nm -g -n nsecs.exe > nsecs.num
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sparc-rtems5-size nsecs.exe
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text data bss dec hex filename
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121392 1888 6624 129904 1fb70 nsecs.exe
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cp nsecs.exe nsecs.ralf
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make[6]: Leaving directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/ c/erc32/testsuites/samples/nsecs'
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make[5]: Leaving directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/ c/erc32/testsuites/samples'
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make[4]: Leaving directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/ c/erc32/testsuites/samples'
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make[4]: Entering directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/ c/erc32/testsuites'
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make[4]: Nothing to be done for 'all-am'.
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make[4]: Leaving directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/ c/erc32/testsuites'
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make[3]: Leaving directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/ c/erc32/testsuites'
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/ c/erc32'
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make[1]: Leaving directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/c'
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make[1]: Entering directory '/home/chris/development/rtems/kernel/erc32'
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make[1]: Nothing to be done for 'all-am'.
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make[1]: Leaving directory '/home/chris/development/rtems/kernel/erc32'
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Installing A BSP
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----------------
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All that remains to be done is to install the kernel. Installing RTEMS copies
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the API headers and architecture specific libraries to a locaiton under the
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`prefix` you provide. You can install any number of BSPs under the same
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`prefix`. We recommend you have a separate `prefix` for different versions of
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RTEMS. Do not mix versions of RTEMS under the same `prefix`. Make installs
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RTEMS with the following command:
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.. code-block:: none
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$ make install
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Making install in tools/build
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make[1]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/build'
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/build'
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/bin/mkdir -p '/home/chris/development/rtems/5/bin'
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/usr/bin/install -c cklength eolstrip packhex unhex rtems-bin2c '/home/chris/development/rtems/5/bin'
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/bin/mkdir -p '/home/chris/development/rtems/5/bin'
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/usr/bin/install -c install-if-change '/home/chris/development/rtems/5/bin'
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make[2]: Nothing to be done for 'install-data-am'.
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/build'
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make[1]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/build'
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Making install in tools/cpu
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make[1]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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Making install in generic
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/cpu/generic'
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make[3]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/cpu/generic'
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make[3]: Nothing to be done for 'install-exec-am'.
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make[3]: Nothing to be done for 'install-data-am'.
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make[3]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/cpu/generic'
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/cpu/generic'
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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make[3]: Entering directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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make[3]: Nothing to be done for 'install-exec-am'.
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make[3]: Nothing to be done for 'install-data-am'.
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make[3]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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make[1]: Leaving directory '/home/chris/development/rtems/kernel/erc32/tools/cpu'
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....
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make[1]: Leaving directory '/home/chris/development/rtems/kernel/erc32/sparc-rtems5/c'
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make[1]: Entering directory '/home/chris/development/rtems/kernel/erc32'
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make[2]: Entering directory '/home/chris/development/rtems/kernel/erc32'
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make[2]: Nothing to be done for 'install-exec-am'.
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/bin/mkdir -p '/home/chris/development/rtems/5/make'
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/usr/bin/install -c -m 644 /home/chris/development/rtems/kernel/rtems/make/main.cfg /home/chris/development/rtems/kernel/rtems/make/leaf.cfg '/home/chris/development/rtems/5/make'
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/bin/mkdir -p '/home/chris/development/rtems/5/share/rtems5/make/Templates'
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/usr/bin/install -c -m 644 /home/chris/development/rtems/kernel/rtems/make/Templates/Makefile.dir /home/chris/development/rtems/kernel/rtems/make/Templates/Makefile.leaf /home/chris/development/rtems/kernel/rtems/make/Templates/Makefile.lib '/home/chris/development/rtems/5/share/rtems5/make/Templates'
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/bin/mkdir -p '/home/chris/development/rtems/5/make/custom'
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/usr/bin/install -c -m 644 /home/chris/development/rtems/kernel/rtems/make/custom/default.cfg '/home/chris/development/rtems/5/make/custom'
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make[2]: Leaving directory '/home/chris/development/rtems/kernel/erc32'
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make[1]: Leaving directory '/home/chris/development/rtems/kernel/erc32'
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Contributing Patches
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--------------------
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RTEMS welcomes fixes to bugs and new features. The RTEMS Project likes to have
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bugs fixed against a ticket created on our :r:url:`devel`. Please raise a
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ticket if you have a bug. Any changes that are made can be tracked against the
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ticket. If you want to add a new a feature please post a message to
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:r:list:`devel` describing what you would like to implement. The RTEMS
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maintainer will help decide if the feature is in the best interest of the
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project. Not everything is and the maintainers need to evalulate how much
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effort it is to maintain the feature. Once accepted into the source tree it
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becomes the responsibility of the maintainers to keep the feature updated and
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working.
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Changes to the source tree are tracked using git. If you have not made changes
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and enter the source tree and enter a git status command you will see nothing
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has changed:
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.. code-block:: none
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$ cd ../rtems
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$ git status
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On branch master
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Your branch is up-to-date with 'origin/master'.
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nothing to commit, working directory clean
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We will make a change to the source code. In this example I change the help
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message to the RTEMS shell's ``halt`` command. Running the same git status
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command reports:
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.. code-block:: none
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$ git status
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On branch master
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Your branch is up-to-date with 'origin/master'.
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Changes not staged for commit:
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(use "git add <file>..." to update what will be committed)
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(use "git checkout -- <file>..." to discard changes in working directory)
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modified: cpukit/libmisc/shell/main_halt.c
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no changes added to commit (use "git add" and/or "git commit -a")
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As an example I have a ticket open and the ticket number is 9876. I commit the
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change with the follow git command:
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.. code-block:: none
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$ git commit cpukit/libmisc/shell/main_halt.c
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An editor is opened and I enter my commit message. The first line is a title
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and the following lines form a body. My message is:
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.. code-block:: none
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shell: Add more help detail to the halt command.
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Closes #9876.
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# Please enter the commit message for your changes. Lines starting
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# with '#' will be ignored, and an empty message aborts the commit.
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# Explicit paths specified without -i or -o; assuming --only paths...
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#
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# Committer: Chris Johns <chrisj@rtems.org>
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#
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# On branch master
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# Your branch is up-to-date with 'origin/master'.
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#
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# Changes to be committed:
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# modified: cpukit/libmisc/shell/main_halt.c
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When you save and exit the editor git will report the commit's status:
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.. code-block:: none
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$ git commit cpukit/libmisc/shell/main_halt.c
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[master 9f44dc9] shell: Add more help detail to the halt command.
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1 file changed, 1 insertion(+), 1 deletion(-)
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You can either email the patch to :r:list:`devel` with the following git
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command, and it is `minus one` on the command line:
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.. code-block:: none
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$ git send-email --to=devel@rtems.org -1
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<add output here>
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Or you can ask git to create a patch file using:
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.. code-block:: none
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$ git format-patch -1
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0001-shell-Add-more-help-detail-to-the-halt-command.patch
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This patch can be attached to a ticket.
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