The debug UART has both the uboot software behind it on boot, and later a
linux serial console.
During boot, if your device emits any characters, this will trick uboot
into putting up its menu and hanging the boot process. It will be waiting
for you to make a menu choice and your device will
I do not know that uboot would / would not damage your UART device, but I
also do not know that it will not. Then as dickelbeck mentions above there
are other potential pitfalls.
As for the Linux console, this could / should be configurable via inittab,
but uboot I have no idea exactly what needs
