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MPC860 Cache problem on redboot rom Image


I am poring eCos to my MPC860 board ,I have built
redboot images based on MBX port. The RAM image of
redboot works fine and everything is ok there. but the
rom image which I burnt on the system flash, has
problem with caches ,when I enable caches in redboot
with cache command , system raise an Machiine check
exception and jumps at (0x200)(I know it with my BDM
). Its interesting that when I load my redboot ram
image from the redboot via serial port and execute it
again, every thing becomes fine and caches work
correctly. 
Thanks in advance for any help and comment


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