[U-Boot] [PATCH v2] armv8: caches: Added routine to set non cacheable region

[Mark Rutland]

On Tue, May 12, 2015 at 04:46:49AM +0100, Siva Durga Prasad Paladugu wrote:
> Hi Mark,
> 
> 
> > -----Original Message-----
> > From: Mark Rutland [mailto:mark.rutland at arm.com]
> > Sent: Wednesday, April 29, 2015 10:00 PM
> > To: Michal Simek
> > Cc: u-boot at lists.denx.de; Albert Aribaud; Marek Vasut; Tom Rini; Siva Durga
> > Prasad Paladugu; Varun Sethi; Thierry Reding; Arnab Basu; York Sun
> > Subject: Re: [U-Boot] [PATCH v2] armv8: caches: Added routine to set non
> > cacheable region
> > 
> > Hi Michal,
> > 
> > On Wed, Apr 29, 2015 at 09:35:35AM +0100, Michal Simek wrote:
> > > Added routine mmu_set_region_dcache_behaviour() to set a particular
> > > region as non cacheable.
> > 
> > What's the intended use of this?
> This is intended to mark a dynamically allocated region as non-cacheable region in runtime.

Sure, but why does that region need to be non-cacheable?

I assume you want to give the region to some device?

Do you ever hand the memory back (and hence need to make it cacehable
again)?

> There is same kind of routine for armv7 but not for armv8. Do you think that the same functionality to be addressed for armv8 too? 
> 
> As per below comment, you are correct, this looks like to be more board specific.

While the address of the tables might be board-specific I'd imagine
that the manipulation routines can be shared.

Thanks,
Mark.