FIFOed Avalon Uart

My thoughts on this is that writing a driver for the UART isn't that difficult, so you might as well write one with the interfaces you need, and remove all the extra layers of abstraction between the driver itself and the stdio functions.

If your software 'scheduler' just calls every task in turn (adequate for a small embedded system), it may be appropriate to have a read_uart() function that is called where you now have fread() that directly recovers data from the fifo itself.