My Flight controller did'nt connect to TELEM IN PIXHAWK 1

Hello everyone I recently created my own FC Through the Open source File of Pixhawk 1 in stm32 board with all ics requied. I have uploaded the bootloader and firmware of v2 via stlink in my fmu stm32f427. After completion of adding firmware it could not connect to telem port? Why is there Mavelink protocol not added to firmware or anything else if anyone face this issue please help me.
Thank you!