Re: CONFIG_MIPS_UNCACHED

[Jun Sun <jsun@mvista.com>]

On Sat, Jun 23, 2001 at 10:15:49PM +0200, Kevin D. Kissell wrote:
> > > Since the kernel cache attribute is never initialized before
> > > ld_mmu_{whatever} is invoked, and since that Config field
> > > does not have a well-defined reset state on many MIPS
> > > CPUs, it would appear that we are in effect trusting the
> > > bootloader to have done something reasonable like
> > > set kseg0 to be non-cachable or write-through, either
> > > of which would be safe for the current code.
> >
> > I think you just proposed a fix: check current config register when we
> turn
> > off cache.  Thanks. :-)
> 
> That's a heuristic at best.  If the config register comes up random,
> it can appear to be sane even though the cache is in fact uninitialized.
> 

For any practical reasons, we can assume there is a loader for Linux,
and we can assume loader does not run with a random config register.

Jun