RAMDISK_MAJOR 11 include/linux/major.h #define RAMDISK_MAJOR 1 RAMDISK_MAJOR 10 include/linux/root_dev.h Root_RAM0 = MKDEV(RAMDISK_MAJOR, 0), RAMDISK_MAJOR 11 include/linux/root_dev.h Root_RAM1 = MKDEV(RAMDISK_MAJOR, 1),