CONFIG_SYS_HAS_CPU_TX49XX is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
CONFIG_SYS_HAS_CPU_TX49XX (not configurable)
configname: CONFIG_SYS_HAS_CPU_TX49XX
Linux/MIPS Kernel Configuration
└─>CPU selection
└─>SYS_HAS_CPU_TX49XX