CONFIG_ALPHA_BOOK1 is not available for thedefaultarchitecture x86.
Result is shown for architecture alpha
default or selected kernelversion does not have config value CONFIG_ALPHA_BOOK1.
Result is shown for kernelversion 6.9.9

AlphaBook1

modulename: sys_sio.ko

configname: CONFIG_ALPHA_BOOK1

Alpha system type
└─>AlphaBook1
In linux kernel since version 2.6.12  
Dec AlphaBook1/Burns Alpha-based laptops.

source code:
arch/alpha/kernel/