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How to get rid of board support package?

I want to get rid of the board support package, and write my own code to interface with the least complicated drivers for UART, BLE and SPI etc.

If I remove BSP I ifind lots of compile errors if I try use the UART driver. Can I not use some drivers without using bsp too?

Is there any guid to setting up my own project 'from the ground up' without instead trying to strip down an example project that has the BSP woven into it?

Thaks