Within our EmberZNet and Silicon Labs Thread stacks we provide a number of pre-built NCP images. However, with the customability EFR32 Mighty Gecko, these NCP images don't always meet every application. This guide, along with reading AN1010: Building a Customized NCP Application, should give you the tools to build your own xNCP image.
#define UART_XNCP_BUILDComment out the one you aren’t using and make sure the one you need is defined
Use the following KBA for building a bootloader: