CONFIG_TC is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

TURBOchannel support

modulename: tc.ko

configname: CONFIG_TC

Linux/MIPS Kernel Configuration
└─>Bus options (PCI, PCMCIA, EISA, ISA, TC)
└─>TURBOchannel support
In linux kernel since version 2.6.12  
TurboChannel is a DEC (now Compaq (now HP)) bus for Alpha and MIPS
processors. Documentation on writing device drivers for TurboChannel
is available at:
<http://www.cs.arizona.edu/computer.help/policy/DIGITAL_unix/AA-PS3HD-TET1_html/TITLE.html>.

source code:
drivers/tc/