David H. Lynch Jr. wrote:

I had a similar problem. In my instance it turned out that I was
inadvertently using the physical address of my uart as the output address.
This worked during boot becasue there was a 1:1 physical-logical entry
stuffed into the MMU. But since Linux did nto know about it, as soon as
the VM system decided to use that TLB entry IO died - right in the
middle of a string.

While it is unlikely you made exactly the same mistake. One area you can
check is memory.

What is your output device ?

  

My Output Device is a Xilinx UartLite at 0x40600000 and the kernel
detects this
as /dev/ttyUL0.

Georg







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