How do I reset a Stratix IV Dev. board via system console?

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I assume you mean..

# Print the list of JTAG commands (commands prefixed with jtag)

tcl> info commands jtag*

jtag idcode jtag pulse nconfig jtag read jtag node id jtag node is bytestream

jtag open jtag resetrequest jtag write jtag node is master jtag send

jtag print hub info jtag close jtag usercode jtag print node info

jtag number of nodes

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Yep, that's the software API to toggle it. You can also issue JTAG low-level commands to get to the register that toggles it. The protocol and testbenches are here

http://www.ovro.caltech.edu/~dwh/correlator/pdf/altera_jtag_to_avalon_analysis.pdf

http://www.ovro.caltech.edu/~dwh/correlator/pdf/altera_jtag_to_avalon_analysis.zip

I'm pretty sure the Tcl script with one of those tutorials has a command that toggles the reset line - it may use the jtag resetrequest command directly.

Cheers,

Dave