Re: OC?

[Marko Mlinar <markom at opencores dot org>]

On Tuesday 28 January 2003 20:45, Andrew Cagney wrote:
> > Hi Andrew!
> >
> >> Turns out this has been done.
> >>
> >> > We have also problems with registers. You were saying something that
> >> > we should move all the registers (we have 8k+ registers with generated
> >> > names) into the temporary storage (I hope all these won't get cached
> >> > in the host...).
>
> 8k * 8 bytes ~= 64k.
>
> Either that all lives in the text segment, or it is only allocated when
> all the names are asked for.

Andrew,

I was referring more to register transfer. Most of the registers should not be 
chached at all -- the value read from these special purpose registers (SPRs) 
can differ in time/access. Some registers may also have clear-after-read, 
FIFO implemented or any other obscure functionality.

It would be nice if all names would be generated, instead of storing their 
names, however I suppose nobody with our target will complain about high 
memory usage.

Another problem is with printing it out and displaying. Unfortunatelly I don't 
know how exaclty the remote debuggers work (we mostly use DDD), but if they 
try to read all registers when e.g. they reach breakpoint -- it will break 
the target (because e.g. clear-after-read). And besides it may take a while 
to load them all in.

> >> Yes.  A gui for instance will likely want access to all names at once.
> >
> > I tried to fix this issue, but there were not enough documentation nor
> > such targets for me to dig through. Is it possible that you (or somebody
> > else) change this please?
>
> I'm not sure what the problem is.  Just wrap the current code in
> something that maintains a table of previously returned names.

I don't know a lot of internals, which are common knowledge for most here, and 
I didn't know if my solutions would solve all above issues.

thanks,
Marko