[PATCH V3 3/4] ARM: Xilinx: base header files and assembly macros

[Stephen Boyd]

On 02/17/2011 02:01 AM, Jamie Iles wrote:
>> +
>> +static void putc(char ch)
>> +{
>> +	/*
>> +	 * Wait for room in the FIFO, then write the char into the FIFO
>> +	 */
>> +	while (UART_STATUS(LL_UART_PADDR) & UART_SR_TXFULL)
>> +		;
>
> It might be worth adding a barrier() call to these loops to be explicit 
> about the volatility.

I think you want cpu_relax() then.

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