mtd解析过程中自动挂载rootfs

该方法适用于通过command line划分分区时，能够自动mount rootfs；

Index: drivers/mtd/mtdpart.c

===================================================================
--- drivers/mtd/mtdpart.c       (revision 26240)
+++ drivers/mtd/mtdpart.c       (working copy)
@@ -29,6 +29,7 @@
 #include <linux/kmod.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
+#include <linux/root_dev.h>
 #include <linux/err.h>
 
 #include "mtdcore.h"
@@ -642,6 +643,13 @@
                mutex_unlock(&mtd_partitions_mutex);
 
                add_mtd_device(&slave->mtd);
+               if (!strcmp(parts[i].name, "rootfs")) {
+                       if (ROOT_DEV == 0) {
+                               printk(KERN_NOTICE "mtd: partition \"rootfs\" "
+                                       "set to be root filesystem\n");
+                               ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
+                       }
+               }
 
                cur_offset = slave->offset + slave->mtd.size;
        }