[U-Boot] "Error reading cluster"

[Hai, Mr. Dinh Tuan]

Hi,

I am using a switch (Dell S4810-ON), which comes with U-Boot preinstalled.
When I tried to install a new OS for the switch, I always get the message
as below:

Partition Map for MMC device 0  --   Partition Type: DOS

Part    Start Sector    Num Sectors     UUID            Type
  1     16              31280           c3096657-01     83
  2     31296           125056          c3096657-02     83
  3     156352          15883584        c3096657-03     83
reading switchlight-loader
Error reading cluster
** Unable to read file switchlight-loader **
WARNING: adjusting available memory to 30000000
## Booting kernel from Legacy Image at 10000000 ...
   Image Name:
   Image Type:   PowerPC Linux Multi-File Image (gzip compressed)
   Data Size:    6784030 Bytes = 6.5 MiB
   Load Address: 00000000
   Entry Point:  00000000
   Contents:
      Image 0: 3375086 Bytes = 3.2 MiB
      Image 1: 3400856 Bytes = 3.2 MiB
      Image 2: 8070 Bytes = 7.9 KiB
   Verifying Checksum ... Bad Data CRC
ERROR: can't get kernel image!

Since I'm totally new with U-Boot, could anyone give me a clue about this
problem?

Thank you very much!

Regards,
Hai