RTOS/AMIC110: Use SPI and GPIO in PRU-ICSS-Profinet_Slave Example

Part Number:AMIC110

Tool/software:TI-RTOS

Hi Together,

I want to use the SPI in the PRU-ICSS-Profinet_Slave Example.

What I did till now is to add an Task, which initializes the SPI as following:

void spiFunction(void) {
    static SPI_Handle spiHandle1 = NULL;
    static SPI_Handle spiHandle2 = NULL;
    static SPI_Params spiParams;
    SPI_Transaction spiTransaction;


    TaskP_sleep(20000);    

    //Board_initSPI();
    UART_printf("Start SPI task\n");

    SPI_Params_init(&spiParams);
    spiParams.transferMode = SPI_MODE_BLOCKING;
    spiParams.transferTimeout = SPI_WAIT_FOREVER;
    spiParams.transferCallbackFxn = NULL;
    spiParams.mode = SPI_MASTER;
    spiParams.bitRate = 4000000;
    spiParams.dataSize = 6;
    spiHandle1 = SPI_open(0, &spiParams);
    spiHandle2 = SPI_open(1, &spiParams);

    uint8_t transmitBuffer[1];

    transmitBuffer[0] = 0xFF;

    spiTransaction.count = 1;
    spiTransaction.txBuf = transmitBuffer;
    spiTransaction.rxBuf = NULL;


    while(1) {
        TaskP_sleep(500);
        SPI_transfer(spiHandle1, &spiTransaction);
        SPI_transfer(spiHandle2, &spiTransaction);
        UART_printf("Send spi\n");
    }
}

After this, I checked the pins of the TMDXICE110-BTA board and nothing happens.
So I had a look at the schematic and figured out, that the PIN-HEADS first had to be enabled by setting pin MII2_RXD0 to low. But after one hour of searching I couldn't figure out, how to do this. First I need somehow to define which pin I want to talk to, am I right?

This should be written in an PIN-MUX file. But where to find it? The PROFINET_IRT_Slave_Datasheet says something like that:

"HW signals required to implement PROFINET IRT slave functionality is shown below, this info needs to
be used in conjunction with  http://www.ti.com/tool/PINMUXTOOL"

So do I need to make my own PINMUX-File?

Or how can I talk SPI with this project?

Best Regards

Stefan