直插SIM卡全网五模便携LEDE路由（5200mAh）

之前买了个ZTE Q7便携路由，也可以刷op，但是不能直接插sim卡，携带不是很方便，最近在网上逛了逛，发现了一个神器，配置为 mt7620a ROM 16M/RAM 128M 5200mAh，花了一周时间，适配了LEDE 17.07.0 正式版本系统，目前实现了几个功能：
1.直插sim卡上网，目前测试了移动3g和联通3g，使用的是上海移远EC20-C 4g mini pcie模块（注意经研究该模块有很多个批次，需要芯片为高通MDM9215才行，pid 05c6 vid 9215），参数为：
EC20-C

FDD LTE: B1/B3/B8
TDD LTE: B38/B39/B40/B41
TDSCDMA: B34/B39
UMTS: B1/B8
GSM: 900/1800MHz

参数是支持（移动4g 3g 2g，联通4g 3g 2g，电信4g）
原厂OP可以支持EC20-CE（高通MDM9215，pid 05c6 vid 9215，注意此CE支持电信3g）但不支持EC20-CE（高通MDM9x07，pid 2c7c vid 0125）
EC20-CE

FDD LTE: B1/B3 
TDD LTE: B38/B39/B40/B41 
TDSCDMA: B34/B39 
WCDMA: B1 
CDMA2000 1x/EVDO: BC0 
GSM: 900/1800MHz 

目前LEDE 17.07是4.4的kernel，开源驱动仅支持EC20-C 4g模块（芯片为高通MDM9215，pid 05c6 vid 9215），查阅linux kernel qmi_wwan.c源代码，4.10可以支持EC20-CE（高通MDM9x07，pid 2c7c vid 0125），但目前LEDE还不行。
2.直插SD卡，但是根据原厂说明，usb仅限对外充电，不支持外挂U盘
3.LEDE/OPENWRT的其他功能，例如ss等

适配采用修改ZTE-Q7代码来实现（led在系统启动的时候是不亮的，启动成功后显示蓝色，囧）：
1.修改target/linux/ramips/base-files/etc/board.d/01_leds

zte-q7)
	ucidef_set_led_default "power" "power" "$board:green:sys" "0"
	;;

2.修改target/linux/ramips/base-files/etc/diag.sh

zte-q7)
		status_led="$board:green:wifi"
		;;

3.修改target/linux/ramips/dts/ZTE-Q7.dts

/dts-v1/;

#include "mt7620a.dtsi"

#include <dt-bindings/input/input.h>

/ {
	compatible = "ZTE-Q7", "ralink,mt7620a-soc";
	model = "ZTE Q7";

	gpio-leds {
		compatible = "gpio-leds";

		usb {
			label = "zte-q7:usb";
			gpios = <&gpio0 11 1>;
		};
		sys {
			label = "zte-q7:sys";
			gpios = <&gpio1 14 1>;
		};
		wlan {
			label = "zte-q7:wlan";
			gpios = <&gpio3 0 1>;
		};
		wps {
			label = "zte-q7:wps";
			gpios = <&gpio1 15 0>;
		};
	};

	gpio-keys-polled {
		compatible = "gpio-keys-polled";
		#address-cells = <1>;
		#size-cells = <0>;
		poll-interval = <20>;

		reset {
			label = "reset";
			gpios = <&gpio0 1 0>;
			linux,code = <0x198>;
		};
	};
};

&gpio0 {
	status = "okay";
};

&gpio1 {
	status = "okay";
};

&gpio3 {
	status = "okay";
};

&spi0 {
	status = "okay";

	en25q128@0 {
		#address-cells = <1>;
		#size-cells = <1>;
		compatible = "w25q128";
		reg = <0>;
		linux,modalias = "m25p80";
		spi-max-frequency = <10000000>;

		partition@0 {
			label = "u-boot";
			reg = <0x0 0x30000>;
			read-only;
		};

		partition@30000 {
			label = "u-boot-env";
			reg = <0x30000 0x10000>;
			read-only;
		};

		factory: partition@40000 {
			label = "factory";
			reg = <0x40000 0x10000>;
			read-only;
		};

		partition@50000 {
			label = "firmware";
			reg = <0x50000 0xfb0000>;
		};
	};
};

&pinctrl {
	state_default: pinctrl0 {
		gpio {
				ralink,group ="i2c", "uartf", "wled", "spi refclk";
				ralink,function = "gpio";
			};
                        pa {
                                ralink,group = "pa";
                                ralink,function = "pa";
                        };
	};
};

&ethernet {
	pinctrl-names = "default";
	pinctrl-0 = <&ephy_pins>;
	mtd-mac-address = <&factory 0x4>;
	mediatek,portmap = "wllll";
};

&wmac {
	ralink,mtd-eeprom = <&factory 0>;
};

&sdhci {
	status = "okay";
};

&ehci {
	status = "okay";
};

&ohci {
	status = "okay";
};

&pcie {
	status = "okay";

	compatible = "ralink,mt7620a-pci";
		reg = <0x10140000 0x100
			0x10142000 0x100>;

		resets = <&rstctrl 26>;
		reset-names = "pcie0";

		interrupt-parent = <&cpuintc>;
		interrupts = <4>;
};

最后编译的时候，选择

git clone https://git.lede-project.org/source.git
git fetch --tags
git tag -l
git checkout v17.01.0

参考：
1.http://lists.infradead.org/pipermail/lede-commits/2016-September/000876.html
2.https://lists.openwrt.org/pipermail/openwrt-devel/2015-March/032268.html
3.http://lxr.free-electrons.com/source/drivers/net/usb/qmi_wwan.c