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

TURBOchannel support

modulename: tc.ko

configname: CONFIG_TC

Linux 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. TURBOchannel programming specifications are available
at:
<ftp://ftp.hp.com/pub/alphaserver/archive/triadd/>
and:
<http://www.computer-refuge.org/classiccmp/ftp.digital.com/pub/DEC/TriAdd/>
Linux driver support status is documented at:
<http://www.linux-mips.org/wiki/DECstation>

source code: