插入SD卡 出现以下信息，是怎么回事？


mmcblk0: mmc0:1234 SA08G 7.28 GiB
mmcblk0: retrying using single block read
mmcblk0: error -110 transferring data, sector 0, nr 8, card status 0x900
end_request: I/O error, dev mmcblk0, sector 0
mmcblk0: error -110 transferring data, sector 1, nr 7, card status 0x900
end_request: I/O error, dev mmcblk0, sector 1
mmcblk0: error -110 transferring data, sector 2, nr 6, card status 0x900
end_request: I/O error, dev mmcblk0, sector 2
mmcblk0: error -110 transferring data, sector 3, nr 5, card status 0x900
end_request: I/O error, dev mmcblk0, sector 3
mmcblk0: error -110 transferring data, sector 4, nr 4, card status 0x900
end_request: I/O error, dev mmcblk0, sector 4
mmcblk0: error -110 transferring data, sector 5, nr 3, card status 0x900
end_request: I/O error, dev mmcblk0, sector 5
mmcblk0: error -110 transferring data, sector 6, nr 2, card status 0x900
end_request: I/O error, dev mmcblk0, sector 6
mmcblk0: error -110 transferring data, sector 7, nr 1, card status 0x900
end_request: I/O error, dev mmcblk0, sector 7
Buffer I/O error on device mmcblk0, logical block 0
mmcblk0: retrying using single block read
mmcblk0: error -110 transferring data, sector 0, nr 8, card status 0x900
end_request: I/O error, dev mmcblk0, sector 0
mmcblk0: error -110 transferring data, sector 1, nr 7, card status 0x900
end_request: I/O error, dev mmcblk0, sector 1
mmcblk0: error -110 transferring data, sector 2, nr 6, card status 0x900
end_request: I/O error, dev mmcblk0, sector 2
mmcblk0: error -110 transferring data, sector 3, nr 5, card status 0x900
end_request: I/O error, dev mmcblk0, sector 3
mmcblk0: error -110 transferring data, sector 4, nr 4, card status 0x900
end_request: I/O error, dev mmcblk0, sector 4
mmcblk0: error -110 transferring data, sector 5, nr 3, card status 0x900
end_request: I/O error, dev mmcblk0, sector 5
mmcblk0: error -110 transferring data, sector 6, nr 2, card status 0x900
end_request: I/O error, dev mmcblk0, sector 6
mmcblk0: error -110 transferring data, sector 7, nr 1, card status 0x900
end_request: I/O error, dev mmcblk0, sector 7
Buffer I/O error on device mmcblk0, logical block 0
mmcblk0: unable to read partition table

就是运行开发板时，把SD卡插入sd卡槽，超级终端显示的信息，而且不能用SD卡刷机，插入SD卡刷机无任何反应（不是SD卡的原因，因为这个SD可以刷其他的6410开发板）  
刷机时   屏幕白色什么都没有，核心板上只有一个红灯亮

没人理我了？