Adding Custom Accelerators - Passing Device Tree from freedom to freedom-u-sdk

I am looking to add some custom accelerators to the the Freedom U500 and are wondering how the device tree is passed to freedom-u-sdk? Many .dts files in the repo… but it is not clear which are used…

Thanks,
Brendon

Answered my own question: Device-tree is included as part of the Bootroom build and pass to the BBL.