[U-Boot] [PATCH] arm: enable unaligned access on ARMv7

Lucas Stach
2012-06-05T19:06:20Z

Hi Stephen,

Am Dienstag, den 05.06.2012, 12:42 -0600 schrieb Stephen Warren:
> On 06/05/2012 11:47 AM, Lucas Stach wrote:
> > Recent toolchains default to using the hardware feature for unaligned access on
> > ARM v7, rather than doing the software fallback. According to ARM this is safe
> > as all v7 implementations have to support this feature.
> > (http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471c/BABJFFAE.html)
> >
> > To avoid CPU hangs when doing unaligned memory access, we have to turn off
> > alignment checking in our CPU initialisation code.
> > (http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491c/CIHCGCFD.html)
>
> Does this behavior change trickle down to Linux/... too, or would an OS
> completely re-initialize this state, and hence not be affected?
>

Linux in particular does reinitialize this state and I expect any
reasonable OS to do so.

-- Lucas