Doc improved + path to find gem5 library

README.md

@@ -1454,7 +1454,7 @@ scons --with-cxx-config --without-python build/ARM/libgem5_opt.so
 cd util/tlm
 ```
 
-In order to use gem5 with DRAMSys set the GEM5 environment variable to the path
+In order to use gem5 with DRAMSys set the **GEM5** environment variable to the path
 to gem5, for example in the QtCreator under Projects > Build & Run > Build
 Environment:
 
@@ -1462,11 +1462,24 @@ Environment:
 GEM5=/path/to/gem5/
 ```
 
+optionally, export environment variables in your **~/.bashrc** file or
+equivalent and open a new terminal:
+
+```
+# In this example gem5 is located at $HOME/gem5 (that is your home folder).
+# Modify the variable to use the correct location.
+export GEM5=$HOME/gem5
+
+# Add the folder containing libgem5_opt.so to the list where libraries should
+# be searched for.
+export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${GEM5}/build/ARM
+```
+
 DRAMSys will detect gem5 and configures automatically the according compile
 target *gem5* for QtCreator.
 
-In order to run gem5 with DRAMSys its mandatory to run gem5 first without
-DRAMSys in order to generate an ini file which will be read by the DRAMSys_gem5
+In order to run gem5 with DRAMSys it is mandatory to run gem5 first without
+DRAMSys in order to generate an **.ini** file which will be read by the DRAMSys_gem5
 binary. In the following several examples for DRAMSys gem5 bindings are shown.
 
 ### DRAMSys with gem5 traffic generator
@@ -1479,7 +1492,7 @@ Base System Architecture:
 | System Port | | TGEN |    |
 +-------+-----+ +--+---+    |
         |           |       | gem5 World
-        |      +----+       | (see this file)
+        |      +----+       |
         |      |            |
 +-------v------v-------+    |
 |        Membus        |    v