default or selected kernelversion does not have config value CONFIG_ARM_AM79C961A.
Result is shown for kernelversion 6.9.9

ARM EBSA110 AM79C961A support

modulename: am79c961a.ko

configname: CONFIG_ARM_AM79C961A

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>ARM EBSA110 AM79C961A support
In linux kernel since version 2.6.12  
If you wish to compile a kernel for the EBSA-110, then you should
always answer Y to this.

source code: