Re: [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(a)tylers.info&gt; 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/Beih...
>  
>  Hope that helps,
>  Matthew 
Thanks, Matthew! That's a great link.

-Chris