CONFIG_ARCH_BCMBCA_CORTEXA9 is not available for the default architecture x86.
Result is shown for architecture arm

Cortex-A9 SoCS


Linux Kernel Configuration
└─> Broadcom SoC Support
└─> Broadcom Broadband Carrier Access (BCA) origin SoC
└─> Cortex-A9 SoCS

Say Y if you intend to run the kernel on a Broadcom Broadband ARM A9
based BCA chipset.

This enables support for Broadcom BCA ARM A9 broadband chipset. Currently
only DSL chip BCM63138.