MCASP does not startup

 Hi All!

I use MCASP in my SYS/BIOS project. I can not understand why my programm stopped in this routine:

/* Release the high frequency clock from reset*/
.
.
.
    while((HWREG(baseAddr + MCASP_GBLCTL) & MCASP_GBLCTL_XHCLKRST)
          != MCASP_GBLCTL_XHCLKRST) ;
.
.
.

In the debugger I see thet programm can not exit from this cycle, Why it happens?