XC Installation process complete and documented

CHANGELOG

+21.03.19 - XC Installation process complete and documented
 11.03.19 - MPSoC build scripts added
 07.03.19 - Cross compiler build scripts added
 

docs/CrossCompiler.txt

+= Introduction =
+The InstallCrossCompiler.sh script downloads, builds and installs all cross compilers needed for our MPSoC Systems.
+This process is split into several steps.
+The scripts creates a temporary directory at ~/.bstemp which is used for the build process of the compilers.
+After each step, a files gets stored at this directory with the file extension ".flag".
+The existing of such a file signals the script, that the corresponding step was successfully completed.
+When a later process fails, the script can be restarted and it will skip all previous steps and tries to restart the failed step directly.
+If you want to rerun a successful step, just remove that file.
+
+The temporary directory can be removed after all compilers were successfully installed.
+
+The compilers for the following architectures will be installed:
+
+  * MicroBlaze (litte endian)
+  * ARM (Cortex A9)
+
+= Using the script =
+
+The script does most of the work automatically.
+Never the less there are some manual steps that are explained in the following subsections.
+
+== Create Installation directory ==
+# As root, replace $USER with your user name
+mkdir /opt/mbxc  && chown $USER:$USER /opt/mbxc
+mkdir /opt/armxc && chown $USER:$USER /opt/armxc
+
+== Install dependencies ==
+Install at least the following packages.
+When the build process fails, install the missing packages as well.
+
+== Execute the script ==
+
+# As user!
+./InstallCorssCompiler.sh
+# Most of the steps take a long time, up to multiple hours!
+
+== Update the PATH variable ==
+
+To be able to execute the compilers, there installation path must be added to the PATH variable.
+To make this automatically, copy the xcpaths.sh script to /etc/profile.d and make it executable:
+
+# As root
+cp resources/xcpaths.sh /etc/profile.d/.
+chmod +x /etc/profile.d/xcpaths.sh
+

resources/xcpaths.sh

+export PATH="$PATH:/opt/mbxc:/opt/armxc"
+