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

BSE-IP

configname: CONFIG_BSEIP

8xx Machine Type
└─>BSE-IP
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
Say Y here to support the Bright Star Engineering ipEngine SBC.
This is a credit-card-sized device featuring a MPC823 processor,
26MB DRAM, 4MB flash, Ethernet, a 16K-gate FPGA, USB, an LCD/video
controller, and two RS232 ports.