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DM648 bootloader issue

Hello All,

                 I have made my customized board based on DM648. It (customized board) only has the Ethernet interfaces with no audio/video or uart links. Its perfectly working in emulation mode with the same performance as that of  DM648. The problem begins when I try to boot it from Flash, its showing erratic behaviour i.e some times it boots successfully and sometimes not & at every time BOOTCMPLT, BOOTADDR & BOOTCFG registers show no error. I am using Flashutility  without any modification for writing flash.

 Now Is there any timing issue that causes this haphazard behavior?

& do I need to change FlashUtility even when my customized board boots well in some attempts?.  

Waiting for ur reply

Regards

Ahmed