Скачать или смотреть Banana Pi M2 Berry blink+UART baremetal C example in Microchip Studio

So today we will be using a SBC with Allwinner R40 quad-core Cortex-A7 just like a normal Cortex-M board (or Arduino), to do this we:
modify u-boot to load our own program instead of a operating system,
create a basic makefile project for the Banana Pi M2 Berry in Microchip Studio,
add a bit of fast blink at startup and recompile the project.

The board runs with one core active in u-boot so no need to put the other 3 cores to sleep in startup.s assembler file.

If You have trouble to use the gcc in Microchip Studio, take a look at this tutorial to setup the gcc and build using Msys2:
https://github.com/linux4sam/at91boot...

Link for downloading the arm gcc:
https://developer.arm.com/downloads/-...

The project setup was mostly ispired by David Welsh, here You have a link to his git with great work:
https://github.com/dwelch67

I was using a Debian image for the micro SD which I got here:
https://wiki.banana-pi.org/Banana_Pi_...

And here the link to the repo with the project:
https://github.com/E-exp/BananaPi_M2_...