Hello_world doesn't work for Arria 10 ubuntu 14.04

To be honest I am not sure. I only know how to force the flat flow, I have no idea how to force the PR flow. The PR flow has always been the default flow and on my environment, the compiler still seems to default to that flow even with 17.0.2. I checked altera's documents again for v17, there is no mention of the flat flow. Even though this flow has existed for a long time, it was never documented, but they seem to have changed something in v17.0.2. Assuming that aoc accepts the "--bsp_flow" switch, I think you should probably use "--bsp_flow top" rather than "base" for the standard PR flow, but I could be wrong.