CONFIG_ARCH_PICOXCELL is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_PICOXCELL.
Result is shown for kernelversion 6.9.9

Picochip PicoXcell

configname: CONFIG_ARCH_PICOXCELL

Linux Kernel Configuration
└─>Picochip PicoXcell
In linux kernel since version 3.1 (release Date: 2011-10-24)