NIOS does not start after SW download (timing issue?)

I have some progress with the debugging. I was able to start Hello World with the NIOS II Eclipse Debugger. Although it seems to be OK in the Debugger, I cannot see the output (standard I/O options are set to JTAG properly now).

There are some more interesting findings about JTAG UART consol, with the original product FW as well:

• On the board there is FTDI USB/JTAG bridge while we can connect USB Blaster via 10-pin header as well
• 6, 16 and 24MHz clocks were tested on both and sof/elf download worked well in every case
• With 6 and 24MHz JTAG clock rates we never get anything from JTAG UART consol
• With 16MHz JTAG clock some FW versions are working with both FTDI and Blaster, some never works while there are some compilation versions which are not working with FTDI but shows up some random messages with the Blaster

So perhaps the issue is somewhere around the JTAG consol. I checked and, unfortunately, did not find too much configuration options in the core or project/device settings so I have no idea what to set.

Regarding the BSP settings, "Enable small driver" for JTAG consol is unchecked (so fast driver is used) while standard I/O options are set to JTAG properly now (as suggested before).