Get Hello, World FreeRTOS program working on a Single Core

[codecubepi]

Split from #328

Modify the downloaded FreeRTOS kernel to make it compatible with the AMDC Zynq-7000 platform

• [x] Use SDK Debug tool to see if the FreeRTOS code is actually being stepped through
• [x] Check if FreeRTOS is being given a timer
• [x] Start with only CPU0, can try to run xil_printf() before any FreeRTOS scheduler stuff runs
• [x] Essentially, write "Hello, world!" program using FreeRTOS tasks that runs on a single core, on hardware

Resources:

• FreeRTOS Reference
• Xilinx Wiki - FreeRTOS
• Zynq-7000 Overview
• Zynq-7000 TRM

[codecubepi]

This was completed with the FreeRTOS-provided example application.

I am running into issues with dual-core execution: when I try to run the Hello World app on both cores, core 0 never reaches main() and core 1's tasks don't seem to run after being created.

Single-core results:

[npetersen2]

Excellent work! :) great to see this working on hardware. @codecubepi says the code for this is still local on this PC.