CONFIG_PS3_VUART is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_PS3_VUART (not configurable)

modulename: ps3-vuart.ko

configname: CONFIG_PS3_VUART

Linux Kernel Configuration
└─>PS3 Platform Options
└─>PS3_VUART
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code: