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unable to simulate usart in loopback mode

I am using the uVision RealView MDK -ARM 4.02 trial version. I am simulating the LM3S5791. I am simulating usart0. I execute the driverlib functions,

UARTConfigSetExpClk(UART0_BASE,12000000,19200, (UART_CONFIG_WLEN_8|UART_CONFIG_STOP_ONE| UART_CONFIG_PAR_NONE));

UARTEnable(UART0_BASE);

I then select the LBE (loopback enable) button on the Simulator menu under "Peripherals"->"Usarts"->"Uart0" Menu. Then while in debug mode I execute the following calls to place data in the TXFIFO.
UARTCharPut (UART0_BASE, 'C'); UARTCharPut (UART0_BASE, 'A'); UARTCharPut (UART0_BASE, 'F'); UARTCharPut (UART0_BASE, 'E'); UARTCharPut (UART0_BASE, '\n');

I see the data in the TXFIFO but there is nothing echo'd in the RXFIFO.

I have also attempted to use the the VTREGs S0IN='C"; in a signal function, and also created a signal function that is advertised as a loopback function to no avail.

Does anyone have a simulated USART for the Cortex-M3 device using the Stellaris Driver Library.