Subject: [PATCH 1/4] ARM: Add __arm_ioremap_exec for mapping external memory as MT_MEMORY

From: [email-masked] (Tony Lindgren)
Date: Fri, 7 Oct 2011 07:43:49 -0700

* Santosh Shilimkar <[email-masked]> [111006 23:06]:
> On Thursday 06 October 2011 03:36 AM, Tony Lindgren wrote:
> > * Nicolas Pitre <[email-masked]> [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