For person in China:
download openwrtyun.tar.gz into PC
uncompress openwrtyun.tar.gz use winscp copy "e2fsprogs_1.42.4-1_ar71xx.ipk" and "fdisk_2.21.2-1_ar71xx.ipk" into Yun.
opkg install fdisk_2.21.2-1_ar71xx.ipk
opkg install e2fsprogs_1.42.4-1_ar71xx.ipk