2014 robot with 2015 sofware

[iLloyd]

C++ specific:
The first problem is that the new code can't compile to the old cRIO. You can't use the old plugins because the last free license of WindRiver expired in January. I would look into Team 1151's Thunder cRIO C++ tools, which let you compile cRIO plugins in Eclipse. If you are porting a 2015 program to a 2014 cRIO, make sure to follow this guide; but in reverse.

Java:
We are not a Java team but you can use NetBeans, the old 2014 plugins, and the old version of Java to get your code on a 2014 robot. If you are porting a 2015 program to a 2014 cRIO, make sure to follow this guide; but in reverse.
(Thanks FrankJ)

LabVIEW:

FRC 2015 code can be run on a 4-slot cRIO as well as the roboRIO.

An 8-slot cRIO will only run FRC 2014 code, but last year's LabVIEW license doesn't expire.

(Thanks Mark McLeod)

General:
Make sure all your hardware is configured using the 2014 software (most importantly the router). Make sure to set your driver station laptop to a static IP address. I would read the 2014 ScreenSteps to make sure you configure everything correctly and you wired everything correctly.

This information may not complete or correct. Our team hasn't done this and this is just based on my knowledge from beta testing and what I have read. If anyone has any corrections, I will edit my post.