We have the following in the tree:

|commit af42feb
|Author: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
|Date:   Mon Jan 2 11:49:17 2012 +0100
|
|    ARM: set SCTRL[A] only when architecture does not support unaligned access
|
|    Recent gcc generates code with unaligned access when architecture
|    supports it. Setting A bit unconditionally causes data-aborts on such
|    code rendering barebox unusable.
|
|    Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
|    Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

What the patch tried is correct: We should set the A bit only when the architecture
does not support unaligned accesses. To figure out whether the architecture supports
unaligned accesses the patch tested for the U bit which is wrong. The U bit may be
0 after a reset, so instead of testing for the U bit we have to set it. This can
be done on armv6 and later. All others have the A bit set to trap unaligned accesses.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>