kernelconfig_penguin
CONFIG_AT91_DEBUG_LL_DBGU0 is not available for the default architecture x86.
Result is shown for architecture arm or blackfin
default or selected kernelversion does not have config value CONFIG_AT91_DEBUG_LL_DBGU0.
Result is shown for kernelversion 4.3.6

Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10, 9rl, 9x5, 9n12

configname: CONFIG_AT91_DEBUG_LL_DBGU0

Kernel low-level debugging port
└─> Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10, 9rl, 9x5, 9n12