块设备驱动-----新创建的分区要格式化后，才能使用！

刚创建的分区，试图把这分区挂载到 /tmp/ 目录下，但是发生错误！

# ls /dev/ramblock*
/dev/ramblock   /dev/ramblock1  /dev/ramblock2
# ls /dev/ramblock* -l
brw-rw----    1 0        0        254,   0 Jan  1 00:07 /dev/ramblock      （表示整个磁盘）
brw-rw----    1 0        0        254,   1 Jan  1 00:07 /dev/ramblock1     （第一个主分区）
brw-rw----    1 0        0        254,   2 Jan  1 00:07 /dev/ramblock2      （第二个主分区）
# mount /dev/ramblock1 /tmp/                   
attempt to access beyond end of device
ramblock1: rw=0, want=1252, limit=640
attempt to access beyond end of device
ramblock1: rw=0, want=1028, limit=640
UDF-fs: No partition found (1)
yaffs: dev is 266338305 name is "ramblock1"
yaffs: passed flags ""
yaffs: Attempting MTD mount on 254.1, "ramblock1"
yaffs: dev is 266338305 name is "ramblock1"
yaffs: passed flags ""
yaffs: Attempting MTD mount on 254.1, "ramblock1"
mount: mounting /dev/ramblock1 on /tmp/ failed: Invalid argument

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解决方案：  格式化新建的分区 /dev/ramblock1    和   /dev/ramblock2  

# mkdosfs /dev/ramblock2
mkdosfs 2.11 (12 Mar 2005)
# mkdosfs /dev/ramblock1
mkdosfs 2.11 (12 Mar 2005)

再试图挂载一次，

# mount /dev/ramblock1 /tmp/
# 

挂载成功 ！