default or selected kernelversion does not have config value CONFIG_ATM_FORE200E_PCA_DEFAULT_FW.
Result is shown for kernelversion 5.4.123

Use default PCA-200E firmware (normally enabled)

configname: CONFIG_ATM_FORE200E_PCA_DEFAULT_FW

Linux Kernel Configuration
└─>Networking support
└─>ATM drivers
└─>Use default PCA-200E firmware (normally enabled)
In linux kernel since version 2.6.12  
Use the default PCA-200E firmware data shipped with the driver.

Normal users do not have to deal with the firmware stuff, so
they should say Y here.