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

UCC Fast Protocols Support

modulename: ucc_fast.ko

configname: CONFIG_UCC_FAST

Linux Kernel Configuration
└─>QE Options
└─>UCC Fast Protocols Support
In linux kernel since version 2.6.19 (release Date: 2006-11-29)  
This option provides qe_lib support to UCC fast
protocols: HDLC, Ethernet, ATM, transparent

source code:
arch/powerpc/sysdev/qe_lib/ucc_fast.c


is selected by
CONFIG_UCC_GETH