using peripherals in SYS/BIOS on c2000

I would like to configure SYS/BIOS on a c2000 platform (Piccolo ControlStick) with peripherals such as the SPI bus and the A-D. I have run the TI c28 example code (e.g. task.c) successfully. Now, I want to add the use of on-chip peripherals like A-D and SPI bus. I have successfully used them without SYS/BIOS, but how do I easily incorporate the peripherals with SYS/BIOS? So far, the only way I have found is to strip down DevInit.c into a custom file and add Headers_BIOS.cmd files to my project. Is there a better way to do this? Can I use the graphical tools so I do not have to create a custom header file and explicitly add the cmd file? Thank you, David R