OMAP L138 SPI SLAVE QNX

Hello,

I'm developing a QNX SPI slave driver for OMAPL138.

I planned to use SP1 which is used at boot time for UBL and u-boot loading. 

First of all, can I use OMAP SP1 as slave with flash attached?

Next, I developed the driver using the initialization procedure given by spruh77a.pdf at paragraph 30.2.19, but I cannot intercept interrupts. 

Below, pseudocode of my driver.

SPIGCR0 = 0; //RESET
SPIGCR0 = 1; //OUT OF RESET
SPIGCR1 = 0; //SLAVE MODE
SPIPCO = CLK | SIMO | SOMI; //3-pin mode
SPIDAT1 &= ~(3 << 24); //set SPIFMT0 
SPIFMT0 = 0x08 | POLARITY1; //8bit data, MSB first,POLARITY = 1 and PHASE = 0
SPILVL = (1 << 8);
SPIINT = (1 << 8); //enable interrupt
SPIGCR1 |= SPIENA; //enable SPI controller

Any ideas?

Regards,

Stefano