[fedora-arm] Alignment Issues - TI OMAP and Marvell Kirkwood processors

[Chris Tyler]

On Fri, 2010-07-02 at 15:55 +0100, Matthew Wilson wrote:
> On 2 July 2010 15:03, Chris Tyler <chris at tylers.info> wrote:
> > Oddly, the OMAP system always calculated the right value regardless of
> > the fixups setting, while the Kirkwood needed fixups enabled to display
> > the right value. Why do the two processors act differently? Does the
> > OMAP processor have additional logic handle to handle non-aligned
> > access? [snip]
> 
> Yes.  The OMAP3530's Cortex-A8 supports unaligned memory accesses.
> There will be an overhead for accessing what is actually two memory
> locations and fixing the result, but it'll be nothing like the
> overhead of causing an abort and handling it in the kernel.
> 
> See, for example:
> 
> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0344k/Beihgifg.html
> 
> Hope that helps,
> Matthew

Thanks, Matthew! That's a great link.

-Chris