MSP430FR2676: Customized serial Bootloader and Applicaion sample project

Part Number: MSP430FR2676

Hi

We have project with MSP430FR2676. We would like to develop our own bootloader as our design connects the UART to a RS485 driver so, the bootloader needs to handle also the Request To Send (RTS) signal of the RS485 Driver. Is it possible to have access to the booltloader source code to change as our needs? Or is there availabel how to develop a BSL and Application project from the scratch

Thanks