doc: update

doc/wrpc.in

@@ -174,6 +174,10 @@ should look like this:
   $ export XILINX=/opt/Xilinx/<version>/ISE_DS
 @end example
 
+@b{Note:} the Xilinx project file included in the WRPC sources was created with
+Xilinx ISE 14.1. It is recommended to use the newest available version of ISE
+software.
+
 @sp 1
 HDL sources for WR PTP Core can be synthesized with nothing more but Xilinx 
 ISE software, but using @i{hdlmake} tool developed at CERN is much more 
@@ -298,6 +302,15 @@ the ptp-noposix you have to execute the following git commands:
   $ git submodule update
 @end example
 
+First you have to compile the tools provided with WRPC software which are used
+later during the software compilation:
+
+@example
+  $ cd tools
+  $ make
+  $ cd ..
+@end example
+
 Now you have everything that is needed to build the software for WRPC. Before 
 compilation the decision can be made whether to turn on or not the software 
 support for Etherbone core that is integrated inside WRPC gateware for SPEC