DM3730, DMA under ARM, then DSP

OK, I used CMEM in the following way: first of all,  I set amount of memory for Linux equal to 112M (u-boot settings). Then I do 

insmod cmemk.ko phys_start=0x87000000 phys_end=0x88000000

To get the physical address of the shared memory region I applied the following code:

cmem_params.type = CMEM_HEAP;
cmem_params.flags = CMEM_NONCACHED;
cmem_params.alignment = 32;
if (CMEM_init() == -1) {
fprintf(stderr, "Failed to initialize CMEM\n");
exit(EXIT_FAILURE);
}

printf("CMEM initialized.\n");

cmem_ptr = CMEM_alloc(PAGE_SIZE, &cmem_params);

if (cmem_ptr == NULL) {
fprintf(stderr, "Failed to allocate buffer of size %d\n", PAGE_SIZE);
CMEM_exit();
exit(EXIT_FAILURE);
}
physp = CMEM_getPhys(cmem_ptr); //the physical address

This physical address is then passed to the driver via ioctl. I need it for DMA purposes an I need virtual address for copiing data in the driver. But phys_to_virt leads to kernel panic when I try to write anything to it. What could be the reason?

Alexander.