Description
Due to a problem in the Quartus® II software version 13.0 and 13.1, GNU documentation may not be present in the /nios2eds/documents/gnu-tools folder.
Resolution
To workaround this problem the documents can be downloaded from the following link:
nios2eds_documents_gnu-tools.tar.gz (.tar.gz)
This problem is scheduled to be fixed in a future release of the Quartus II software.