how should I program my board or what are the steps to start prograiming

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sidd_anllinhello everybody
I am currently developing a board which has ARM processor and also includes NAND flash to boot the device
The thing is that I am not understanding how should I program my board or what are the steps to start prograiming to make the board working
I am open to use any opensourced os,need some flow or advice how to start the things
Thank you

First of all you are writing software for ARM processor right so you need some compiler which supports to ARM. KEIL and IAR are some examples start writing code using KEIL or IAR and to load the code you also need some Programmer.