I can find lots of stuff on the software side, but not too clear on the minimum debug interface hardware requirements for Semihosting.
Specifically, is it sufficient to have just the 2-wire SWD interface - SWDIO and SWCLK - or is SWO also required; and/or anything else?
Standard debug interface JTAG or SWD is required. So it should be enough to have the 2-wire SWD (SWDIO and SWCLK).
Thanks.