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AM335x bringup problem

Other Parts Discussed in Thread: AM3352

Hello,

I have problem to bring up an AM3352 processor.
If I start the prozessor I can see on UART0 eight times an "C". Sometime I get continuous "C"´s with a time distance of 300ms. Or I get some "wrong" characters on UART0.  
My sysboot pins are:

MSB              LSB
1000 0000 0100 0111
-> 25MHz
-> RMII
-> Bootsequence EMAC1 MMC0 XIP NAND

Why I get sometimes continuous C sequences or sometimes only eight?
There is possible a problem on clock because I get sometime sequences with broken characters on UART0?