JTAG UART in no interrupt mode .... ie non buffered

To assist in debugging, is it possible to configure the JTAG UART vie it's device driver to run in a non buffered mode , non- interrupt ...

This would mean that the string to stdout would be processed immediately and not posted to a buffer where it is handled in parallel with the program flow.

This way, if the program execution hangs due to a write or read to a bad address, the printf / stdio output will be in synch with the program flow ...

I know there is a device driver that tells the stdio device it can time out if no "terminal" is connected .. so it would be something like that an ioctl call ...

Thanks, Bob.