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Is PORESETn necessary to make a debugger work correctly?

According to the Cortex-M3 trm r2p0(Issue H), Cortex-M3 has 3 reset input signals, PORESETn, SYSRESETn, and DAPRESETn.

Now I am thinking about a SOC with SW-DP and thinking of reducing the number of its terminals.

So I am thing that only SYSRESETn pin is equipped with the SOC and the others are always deasserted with pull-upped internally.

Can I have a debugger work correctly with such a SOC? Or PORESETn and DAPRESETn need to be controlled for a debugger?