fis load exec failed

["Sangsu Baek" <sangsu@xxxxxxxxxxx>]

hi I've some trouble with redboot on a ixp435 custom board.
following works

    > load -r -b 0x01600000 zImage
    > exec
        Using base address 0x01600000 and length 0x00104b4c

Then I created zImage partitions successfully with zImage successfully.

    > 
    > fis list
    Name              FLASH addr  Mem addr    Length      Entry point
    RedBoot           0x50000000  0x50000000  0x00080000  0x00000000
    zimage            0x50080000  0x50080000  0x00120000  0x01600000
    FIS directory     0x50FE0000  0x50FE0000  0x0001F000  0x00000000
    RedBoot config    0x50FFF000  0x50FFF000  0x00001000  0x00000000

But following doesn't work, I don't know why.
    > fis load -b 0x01600000 zimage
    > exec 0x01600000
        Can't execute Linux - invalid entry address

regards

-
Sangsu Baek