CONFIG_NEC_OSPREY is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_NEC_OSPREY.
Result is shown for kernelversion 5.4.123

Support for NEC Osprey board

configname: CONFIG_NEC_OSPREY

Linux/MIPS Kernel Configuration
└─>Machine selection
└─>Support for NEC Osprey board
In linux kernel since version 2.6.12