UART0 console works for UEFI Shell but not once booted.
UP2 10-pin connector for UART0 to FT232R serial to USB converter. PC and Putty terminal.
This arrangement works fine for console access while in UEFI but once I boot, I cannot access the serial port. I was expecting to send debug output to this port via 0x3F8. What am I missing? If UART0 is not tied to 0x3F8, is there a MMIO address for this UART? Is there another UART on the UP2 that does respond to 0x3F8 (traditional COM 1)?