CONFIG_BOARD_ATSTK1002_SW3_CUSTOM is not available for thedefaultarchitecture x86.
Result is shown for architecture avr32
default or selected kernelversion does not have config value CONFIG_BOARD_ATSTK1002_SW3_CUSTOM.
Result is shown for kernelversion 5.13-rc2
SW3: use TIMER1 (not SSC0 and GCLK)
configname: CONFIG_BOARD_ATSTK1002_SW3_CUSTOM
Linux Kernel Configuration
└─>SW3: use TIMER1 (not SSC0 and GCLK)
In linux kernel since version 2.6.23 (release Date: 2007-10-09)
This also prevents using the external DAC as an audio interface.