Looks like we have more issues popped up, now the "device-tree" directory is missing under "/proc". However, from boot log, the blob had been loaded to Kernel:

reading board.dtb
21192 bytes read

## Flattened Device Tree blob at 41f00000
   Booting using the fdt blob at 0x41f00000
   Loading Kernel Image ... OK
OK
   Using Device Tree in place at 41f00000, end 41f082c7

Starting kernel ...


root@arndale:/ # find /proc -name device-tree
root@arndale:/ #