Nothing happend when boot linux to De1

Hi all,

I have followed this guide: https://rocketboards.org/foswiki/Documentation/BuildingBootloader#Cyclone_V_SoC_and_Arria_V_SoC to try building Linux distro for De1-SOC. I have done everything in that guide and created sdcard.img successfully. But when I flash img to sdcard and boot it to De1, nothing happened.