> > SC bit (MIPS3_CONFIG_SC) is bit 17, and read-only.
> 
> Some members of the arc family have a level 2 cache, while others
> don't.  It would be unwise to assmue a value for this bit.

Do you know a platform that this bit cannot be used for secondary
cache related operation in locore?

As far as I've heard, NEC RISCserver 2200 and NEC RISCstation 2250
have correct value (SC==1) about this bit.

My machine (derived from MIPS Magnum) doesn't have secondary cache,
and has correct value (SC==0), too.
--
soda