A word or long copy of 0x0055aaff with U-Boot works fine, but a byte  
copy filled the whole ram with 0x0000aaaa.  The reason is apparently  
that the chip is attached to the local bus in 16-bit mode, which is  
incompatible with byte accesses.  However, the Local Bus doesn't provide 
"low byte" or "high byte" indicators in non-muxed mode.  How is this 
supposed to work then?

Hmm, as I feared... we were bitten by this, too:

http://thread.gmane.org/gmane.linux.drivers.mtd/21521

There is no generic solution yet :(

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Pengutronix e.K.                           | Wolfram Sang                |
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