CONFIG_GPIO=y
CONFIG_SERIAL=y
CONFIG_MODEM=y
CONFIG_NETWORKING=y
CONFIG_NET_IPV4=y
CONFIG_NET_DRIVERS=y
CONFIG_NET_PPP=y
CONFIG_NET_L2_PPP=y
CONFIG_MODEM_GSM_PPP=y
CONFIG_GSM_MUX=y
CONFIG_UART_MUX=y