How to setup trace for STM32H743xx for ulink pro ?
Start with what the mauals tell you:
http://www.keil.com/support/man/docs/uv4/uv4_db_trace.htm
www.keil.com/.../ulinkpro_capture_tracedata.htm
For STM32 specifics, check ST's documentation
www.st.com/.../stm32h7-series.html
eg,
www.st.com/.../jcr:content/translations/en.DM00337873.pdf
For those lacking Andrew's deductive reasoning skills
community.st.com/.../traceini-file-for-stm32h753-tracing-with-keil-ide-and-ulink-pro
To be honest might be worth opening a support ticket with Keil, especially with the new dual core H7 being released.