Build netgear switch firmware based on its GPLed code

Netgear switches are based on GPL code. I have a need to modify the behavior of a switch port. I need someone help me to setup the build environment and actually change it. ## Deliverables I will based on your? specification to setup a server on the Internet for you to remotely connect to it to do the work. You will first download GPLed code from Netgear to build the switch code that can be loaded into that switch.? Then you will need to make changes based on my request.? The detailed changes and switch model will be discussed further in details before I accept you bid. I will provide you the URL for download the code before you place you bid to make sure you can do the work.