CONFIG_MIPS_XXS1500 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

MyCable XXS1500 board

modulename: board-xxs1500.ko

configname: CONFIG_MIPS_XXS1500

Machine type
└─>MyCable XXS1500 board
In linux kernel since version 2.6.12  
source code:
arch/mips/alchemy/board-xxs1500.c