[U-Boot] [v3] command/cache: Add flush command

[Scott Wood <scottwood@freescale.com>]

On 04/07/2013 03:29:31 AM, Wolfgang Denk wrote:
> Dear sun york-R58495,
> 
> In message  
> <C707E9F4D8007146BF8DC1424B113AC70B3A435B@039-SN2MPN1-012.039d.mgd.msft.net>  
> you wrote:
> >
> > > Can we not split this into:
> > >
> > > 	dcache flush
> > > 	icache invalidate
> > >
> > > ?  This would make clear what's happening.
> >
> >
> > The idea is to reuse existing code with minimum addition. For the  
> applicati
> > ons concerned, these two steps are both needed. Splitting them  
> doesn't make
> >  things easier.
> 
> Reusing code is a Good Thing, but not when it comes at the cost of
> obfucating what the code actually does.
> 
> > If I have to use existing command, I'd rather to put these two  
> steps under
> > icache invalide <addr> <size>.
> 
> No, this is not acceptable.  The "icache" command deals with the IC
> only, it must not meddle with the data cache (like flushing it).

I thought you said it was OK to flush more than the user asked for, if  
the implementation does not have separate icache/dcache flushes?  Why  
is it fundamentally different if it's a hardware limitation, or a  
limitation of the software layer whose functionality is being exposed?

-Scott