For those who are interested, I wrote a blog post describing how to set up, compile and run the Hello World demo application using a Linux host, since there doesn't appear to be any such documentation available on this site.
https://shaminospage.blogspot.com/2019/04/hello-world-on-qualcomm-qca402...
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Thank you for creating documentation for QCA4020 Hello World demo.
With these small fix for QCA4024, it worked!