sleep time is doubled, xilinx_zynq_zedboard

[Chris Johns]

On 30/04/2014 9:18 pm, Giovanni Macciocu wrote:
> Hi All,
>
> I'm working with a recent rtems head (23 April 2014) and the 'xilinx_zynq_zedboard' BSP.
>
> I have everything up and running but somehow it looks if my clock / sleep relation is wrong. If i perform an usleep(1000) it will sleep for 2000 us instead of 1000. Also the baudrate of the serial port is 57600 instead 115000.
>
> I wonder if it has something to do with the GTC (Global Clock Time)  which is always clocked at 1/2 of the CPU frequency for an ARM Cortex A9.
>
>
> Has anybody experienced similar problems or does somebody  perhaps have an idea why such an error might occur?
>

I suggest you take a look at the BSPOPTS for the zync BSP. There are 
some clocks you can set and one of these may help. I think 
BSP_ARM_A9MPCORE_PERIPHCLK is the one.

Chris