/* Open a page at the SYSCFG base address */
	fd = open("/dev/mem", O_RDWR | O_SYNC);
	if (fd < 0) {
		printf("Open /dev/mem failed - %s\n", 
			strerror(errno));
		return -1;
	}
	syscfg_addr = (char *)mmap(
		0,
		page_size,
		PROT_READ|PROT_WRITE,
		MAP_SHARED,
		fd,
		syscfg_phys);
	if (syscfg_addr == (char *)MAP_FAILED) {
		printf("Error: syscfg mmap failed\n");
		close(fd);
		return -1;
	}
	devcfg = (unsigned int *)(syscfg_addr + 0x80);
	swlock = (unsigned int *)(syscfg_addr + 0xC0);
	if (*devcfg & 0x60000000) {
		printf("DEVCFG = %.8X: DMA on EGPIO was enabled, disabling ...\n",
				*devcfg);
		*swlock = 0xAA;
		*devcfg &= ~0x60000000;
		printf("DEVCFG = %.8X\n", *devcfg);
	}
	munmap((void *)syscfg_addr, page_size);
	close(fd);