evm自带的SD卡好象出问题了，怎么搞定下？

U-Boot 2010.06 (Jun 01 2011 - 15:00:16)

DRAM:  2 GiB

Using default environment

Hit any key to stop autoboot:  0 

mmc1 is available

reading u-boot.bin

** Unable to read "u-boot.bin" from mmc 1:1 **

## Starting application at 0x80800000 ...

U-Boot 2010.06 (Jun 01 2011 - 15:00:16)

DRAM:  2 GiB

Using default environment

Hit any key to stop autoboot:  0 

mmc1 is available

reading u-boot.bin

** Unable to read "u-boot.bin" from mmc 1:1 **

## Starting application at 0x80800000 ...