AMCC 405ex memory size issue

[konamo]

Hi all,
  we are using u-boot 2009.01, linux-2.6.25-rc2, 1GB DDR2 memory(2Gbit * 4,
1 rank), AMCC powerpc 405ex, both 1G and 512MB memory works fine under
u-boot, but linux boot fails in 1G memory, if we limit mem=512M, linux could
boot. Could anyone pls help us how to find the root cause? thanks
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