CONFIG_ARCH_AT91RM9200DK is not available for the default architecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_AT91RM9200DK.
Result is shown for kernelversion 5.9.9

Atmel AT91RM9200-DK Development board

modulename: board-rm9200dk.ko
configname: CONFIG_ARCH_AT91RM9200DK

Linux Kernel Configuration
└─> Atmel Non-DT world
└─> Atmel AT91RM9200-DK Development board

Select this if you are using Atmel's AT91RM9200-DK Development board.

source code: