Hello Word on HPS using Uboot Arria 10

I have the Arria 10. I have already success to make a boot from Qspi of the HPS include bring up the sof and the NIOS SW to run.
Now I need to make a small code like “hello world” to the terminal on the HPS save it also to the Qspi and make it run.
WHere I can find example or user guide for doning so?