CONFIG_DEBUG_SIRFPRIMA2_UART1 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_DEBUG_SIRFPRIMA2_UART1.
Result is shown for kernelversion 6.9.9

Kernel low-level debugging messages via SiRFprimaII UART1

configname: CONFIG_DEBUG_SIRFPRIMA2_UART1

Kernel low-level debugging port
└─>Kernel low-level debugging messages via SiRFprimaII UART1
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say Y here if you want the debug print routines to direct
their output to the uart1 port on SiRFprimaII devices.