spidev for DE0-Nano-Soc

I have got one method to build everything for de0-nano-soc board,

https://hackmd.io/iwqwlmdsweygtauzgnnmgbmanpekaoyeabjagmurmwjsccg=?view#3-build-linux-filesystem

i have follow this procedure , Board is booted successfully but while booting i got the error continuously as follows,

I tried by changing the card, but result is same.

 mmcblk0: retrying using single block read
 mmcblk0: error -110 transferring data, sector 31115616, nr 80, cmd response 0x900, card status 0x0
 mmc_host mmc0: Bus speed (slot 0) = 200000000Hz (slot req 400000Hz, actual 400000HZ div = 250)
 mmc_host mmc0: Bus speed (slot 0) = 200000000Hz (slot req 25000000Hz, actual 25000000HZ div = 4)
 mmcblk0: error -110 transferring data, sector 31115616, nr 80, cmd response 0x900, card status 0x0
 mmcblk0: retrying using single block read
 mmcblk0: error -110 transferring data, sector 31115704, nr 72, cmd response 0x900, card status 0x0
 mmc_host mmc0: Bus speed (slot 0) = 200000000Hz (slot req 400000Hz, actual 400000HZ div = 250)
 mmc_host mmc0: Bus speed (slot 0) = 200000000Hz (slot req 25000000Hz, actual 25000000HZ div = 4)
 mmcblk0: error -110 transferring data, sector 31115704, nr 72, cmd response 0x900, card status 0x0

what can i do to clear this error?