Can't find HG556a in the target system or target profile

I need help building firmware for HG556a. I followed the tutorial on the main page but when I got to the building part I could not find the chip of my router -Atheros AR9223-

is it possible to download the firmware of the router as source code and add it to the openwrt folder?
btw this is my first build.

Hi, your target profile is not AR9223, that's your modem wifi card. Instead look for BRCM63 target and it'll be there. Read the your device limitations with Openwrt before proceeding with the upgrade (you'll very probably lost the DSL modem capability).