[PATCH 1/4] ARM: Add __arm_ioremap_exec for mapping external memory as MT_MEMORY
Tony Lindgren
tony at atomide.com
Fri Oct 7 10:43:49 EDT 2011
* Santosh Shilimkar <santosh.shilimkar at ti.com> [111006 23:06]:
> On Thursday 06 October 2011 03:36 AM, Tony Lindgren wrote:
> > * Nicolas Pitre <nico at fluxnic.net> [111004 17:26]:
> >> On Tue, 4 Oct 2011, Tony Lindgren wrote:
> > +void __iomem *
> > +__arm_ioremap_exec(unsigned long phys_addr, size_t size, int cached)
> > +{
> > + unsigned int mtype;
> > +
> > + if (cached)
> > + mtype = MT_MEMORY;
> > + else
> > + mtype = MT_MEMORY_NONCACHED;
> > +
> Why don't we allow user to pass the mtype here ?
Well we want to keep the MT_MEMORY types out of asm/io.h.
> We do have a need also to map a page of DDR and SRAM as
> strongly ordered for errata fix and this interface can be
> used for that.
Yeah..
> Ofcourse, SO memory type is not executable memories, so the
> API name might be miss-leading.
..so I think we should just have a separate static mapping for
the omap4 errata fix SO page, and just limit the memory available
for SRAM code to ioremap.
How does that sounds to you?
Tony
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