kernelconfig_penguin
CONFIG_AT91_DEBUG_LL_DBGU3 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_DBGU3.
Result is shown for kernelversion 4.3.6

Kernel low-level debugging on sama5d2

configname: CONFIG_AT91_DEBUG_LL_DBGU3

Kernel low-level debugging port
└─> Kernel low-level debugging on sama5d2