I’m designing a PCB for the P2 to be ready when it becomes available, and I’m planning on adding a JTAG connector for quick programming, specifically this one: 6-Pin Needle Adapter. However, I’m not sure which pin on the P2 should be connected to SWO. I’ve looked at the Argon Eagle files and the SWO pin on its JTAG connector goes directly to the IC and isn’t exposed to any header pin; how should this connect?
The P2 (RTL8721D) only uses SWDIO and SWCLK for programming. Actually, all devices only use those two pins for programming.
SWO is used for dedicated hardware debug trace mode, which is not supported on the RTL8721D.