CONFIG_ALPHA_P2K is not available for thedefaultarchitecture x86.
Result is shown for architecture alpha
default or selected kernelversion does not have config value CONFIG_ALPHA_P2K.
Result is shown for kernelversion 6.9.9

Platform2000

modulename: sys_sio.ko

configname: CONFIG_ALPHA_P2K

Alpha system type
└─>Platform2000
In linux kernel since version 2.6.12  
source code:
arch/alpha/kernel/