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I'm saying that going from the binary .dtb file to a text .dts file is buggy. Or was at one time. I don't know the current state.
I use quartus 14.1.1 and it has dtc. Are you running it from the EDS command shell? It won't work from the NIOS command shell.
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I got a .dtb file from my .dts file but it hangs at: Starting kernel
So taking your suggestion of starting with a good known .dts file I'm hoping that there is one in the GSRD files (I'm not at that computer right now).
I did learn something about Qsys and generating the *.sopcinfo with the proper information for your new IP.
Adding Device Tree Generation Support to an IP Block at
http://www.rocketboards.org/foswiki/documentation/devicetreegenerator131#adding_device_tree_generation_support_to_an_ip_block you can add to the .tcl file for that IP and generate what you need so the sopc2dts conversion has all the information it needs.
Honored Contributor
