rem: console_fd = open("/dev/console", O_RDRW);
add: console_fd = open("/dev/console", O_RDWR);
context: con_init(kernel_args *ka){	dprintf("con_init: entry\n");	console_fd = open("/dev/console", O_RDRW);	dprintf("console_fd = %d\n", console_fd);	return 0;}