SOC Board development

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Hello there, 

we are developing an board for the dnp9200 SOC
(http://www.dilnetpc.com/dnp0069.htm).

We got kernel 2.4.27 running with the board, boots fine, serial port is
working, ethernet is working, everything is good.
but when i try to boot kernel 2.6.10, it hangs.

What could be the cause? io pin reset states? Bus pin reset states? 


this is how far kernel 2.6.10 boots:
Loading Ramdisk at 101f8c3c - 1039e29b, to 20408000 - 205ad65f ... OK

Starting kernel ...
[hang]

My question: how could i debug the boot process? In which files could I put
some printk's to see where the kernel hangs? 


Greets and regards, 

Ole

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