[Q] No message from Kernel (Howto start debug?)

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Maybe you are so kind to give me a hint:

Try to migrate from Kernel 33 to 37. Currently I don't see any message after

  Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

>From what I understand kernel starts with start_kernel()).
What is best way to find out which part is failing? At which point I
do a printk to see what's going on, or at least set a GPIO Pin of the
processor?
How to debug without any external tools like JTAG.
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