From mboxrd@z Thu Jan  1 00:00:00 1970
From: dibacco at libero.it <dibacco@libero.it>
Date: Sun, 25 Jan 2009 19:52:11 +0100 (CET)
Subject: [U-Boot] R: Re: Strange arm9 behaviour reading long(s) not aligned
 to	4 bytes boundary
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>> I have something like this on a 32 bit little endian arm9 board (SAM9 
>> 
L9260):
>>
>> char buffer[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
>>
>> long A = * ( 
(long*) 
>> buffer );
>> long B = * ( (long*) (buffer + 2) );
>>
>> printf("A: %
08x  B: %08x", A, 
>> B);
>>
>> I would expect that A = 0x03020100 and B = 
0x05040302
>> instead I get the 
>> right value for A but  B is 0x01000302 or 
something like this but anyway not 
>> what I expect. 
>> Is there something 
wrong on the board? It seems that only 4 
>> bytes aligned long are read 
correctly.
>
>ARM9 does not support unaligned load/store.  Yours is apparently

>configured in the round-and-rotate mode.
>e
Then my code is simply wrong, that 
is, not allowed? If I have to port code from a PPC (that handles unaligned 
accesses)
to an ARM9 it is painful operation..., isn't it?

Bye,
Antonio.