CONFIG_SCx200 is not available for thedefaultarchitecture x86.
Result is shown for architecture i386

NatSemi SCx200 support

modulename: scx200.ko

configname: CONFIG_SCx200

Linux Kernel Configuration
└─>Bus options (PCI, PCMCIA, EISA, MCA, ISA)
└─>NatSemi SCx200 support
In linux kernel since version 2.6.12  
This provides basic support for National Semiconductor's
(now AMD's) Geode processors. The driver probes for the
PCI-IDs of several on-chip devices, so its a good dependency
for other scx200_* drivers.

If compiled as a module, the driver is named scx200.

source code:
depends
NOT CONFIG_X86_VOYAGER

is selected by
CONFIG_SCx200_GPIO