首先，请参考Flash的相关知识介绍这里。

Hawkeye方案Bootrom切换指南

出现的问题

在Bootrom命令下Flash报错：

[TP-LINK]: reset
0x81edffb0 (tBootrom): disk cache error: device 81ee2da0 block 0 errno 0, disk read failed
0x81edffb0 (tBootrom): disk cache error: device 81ee2da0 block 0 errno c0003, disk read failed
0x81edffb0 (tBootrom): dosFsLib.c : ERROR reading the device boot sector
0x81edffb0 (tBootrom): dosFsLib.c : media not formatted or not present
error

不解的是，为什么dosFsLib.c文件找不到呢？在SDK，工程等等目录下都没有。dosFsLibl.c文件属于vxWorks的部分，所以需要在vxWorks的源码中寻找。

出现该问题的Bootrom版本为：

Press CTRL-B to enter the bootUtil
                *********************************************
                *         TP-LINK  BOOTUTIL(v1.0.0)         *
                *********************************************
                Copyright (c) 2011 TP-LINK Tech. Co., Ltd
                Create Date: Apr 11 2011 16:27:56

打开Bootrom下reset命令的调试输出，部分输出如下：

-> sysFlashReset
sysFlashReset() function
d_name:switch.tp
d_name:webImage.z
d_name:ca.crt
d_name:ca.key
value = 1 = 0x1

-> sysFlashReset
sysFlashReset() function
d_name:switch.tp
d_name:webImage.z
d_name:config.tp
value = 1 = 0x1

-> sysFlashReset
sysFlashReset() function
d_name:switch.tp
d_name:webImage.z
value = 1 = 0x1

现在的升级文件在升级结束之后的第一次启动，都会输出如下所示的信息：

[TP-LINK]: start
Starting...


Retrieved old volume params with %100 confidence:
Volume Parameters: FAT type: FAT12, sectors per cluster 2
  2 FAT copies, 0 clusters, 11 sectors per FAT
  Sectors reserved 1, hidden 0, FAT sectors 22
  Root dir entries 512, sysId (null)  , serial number 621402
  Label:"           " ...
Disk with 6896 sectors of 512 bytes will be formatted with:
Volume Parameters: FAT type: FAT12, sectors per cluster 2
  2 FAT copies, 3420 clusters, 11 sectors per FAT
  Sectors reserved 1, hidden 0, FAT sectors 22
  Root dir entries 512, sysId VXDOS12 , serial number 621402
  Label:"           " ...

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