CONFIG_SH_HP6XX is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

HP6XX

configname: CONFIG_SH_HP6XX

Linux Kernel Configuration
└─>Board support
└─>HP6XX
In linux kernel since version 2.6.16 (release Date: 2006-03-19)  
Select HP6XX if configuring for a HP jornada HP6xx.
More information (hardware only) at
<http://www.hp.com/jornada/>.