[U-Boot] U-boot for Atmel AT91SAM9G20 problem

[Zhong Li]

We have a strange problem running U-boot on an AT91SAM9G20 board.  The board
uses single 16 bit data bus SDRAM chip.  Everything works fine when using
32MB SDRAM chip but U-boot seems to hang when putting in a 64MB SDRAM chip.
The Atmel boot strap code was modified to have the correct row and column
settings for the SDRAM chip.  The hardware is verified to be working fine
with JTAG.  We can also boot directly to Linux from Atmel boot strap code
with some modification.  The memtester is used to verify the SDRAM working
fine after booting up Linux.  So it must be some thing between the boot
strap code and U-boot that upsets the U-boot.  Can anyone give a hint what
might be wrong?

Many thanks in advance,

ZL