Missing JTAG pins of esp32-c6 from the esp32-p4-funtion-ev-board (AEGHB-743)

[andylinpersonal]

Answers checklist.

• [X] I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• [X] I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• [X] I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

Only UART0, EN and boot mode pin are broken out from the onboard ESP32-C6 SoM. USB Serial/JTAG and/or JTAG are simply NC here so there are no native ways to debug the C6 other than gdb_stub. It will be helpful to add these pins back, or at least expose them to an unpopulated pin header. Thanks.

BTW, the two Full Speed USB ports of P4 include its USJ, labeled as IO24~27 on the schematics, are also NC and only accessible via the pin header.

[Horion0415]

Thank you for your feedback! We will consider adding JTAG pins to C6. Additionally, because there were some issues with the P4 USB Serial JTAG and USB FS OTG before, pins 24, 25, 26, and 27 were not connected to the USB port. Since these issues have been resolved, we will consider adding them in future versions.