[PATCH 04/10] 8xx: Always pin kernel instruction TLB

[Joakim Tjernlund]

>
> Dan Malek <dan at embeddedalley.com> wrote on 14/11/2009 19:08:43:
> > On Nov 14, 2009, at 2:42 AM, Joakim Tjernlund wrote:
> >
> > > ..... Avoid this by always pinning
> > > kernel instruction TLB space.
> >
> > You may as well map the data space, too, since you have
> > reserved the entries.  Take advantage of that performance.

Just to be clear, I don't reserve and DTLB entries(I think).
That remains under the config flag.

> > Also, some processor variants have very few TLB entries,
> > and may only reserve two entries (although the flag says
> > reserve 4).  Ensure there are sufficient resources to do
> > what you want.  This is the reason the option is configurable.
>
> Scott had some concerns about pinning the data space too. That is
> is why I left the data TLB pinning behind the the config option.
>
> How to make better use of the remaining ITLB slots is tricky.
> Somehow one would want to map at lest one to modules but I cannot see how.
>