CONFIG_MIPS_DB1235 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_MIPS_DB1235.
Result is shown for kernelversion 6.5.1

Alchemy DB1200/PB1200/DB1300/DB1550/PB1550 boards

modulename: db1235.ko

configname: CONFIG_MIPS_DB1235

Machine type
└─>Alchemy DB1200/PB1200/DB1300/DB1550/PB1550 boards
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/mips/alchemy/devboards/