第二课--OpenWRT 固件定制
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OpenWRT 最新的版本已经提供了 MT7620A 芯片的支持，所以只要是相同芯片的固件，在 MicroWRT 上基本都能直接使用。但由于每款路由器/开发板的接口、配置不尽相同，为了用好 MicroWRT, 还需要对固件进行相应的定制。 本教程基于 OpenWRT 最新版。可以用 git clone git://git.openwrt.org/openwrt.git 获取最新的 OpenWRT 源码。
加入 MicroWRT 硬件描述DTS 是对每一块板上硬件的描述。对于 MicroWRT ，我们需要定制的内容主要包括板卡名称、串口波特率、Flash分区、GPIO、按键、SPI、PCI-E、I2C、网口等硬件接口。将以下内容保存为 target/linux/ramips/dts/MicroWRT.dts /dts-v1/;
/include/ "mt7620a.dtsi"
/ {
compatible = "microwrt", "ralink,mt7620a-soc";
model = "MicroWRT";
chosen {
bootargs = "console=ttyS0,115200";
};
palmbus@10000000 {
gpio2: gpio@660 {
status = "okay";
};
gpio3: gpio@688 {
status = "okay";
};
spi@b00 {
status = "okay";
m25p80@0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "w25q128";
reg = <0 0>;
linux,modalias = "m25p80", "w25q128";
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>;
};
};
};
};
ehci@101c0000 {
status = "okay";
};
ohci@101c1000 {
status = "okay";
};
pcie@10140000 {
status = "okay";
pcie-bridge {
mt76@0,0 {
reg = <0x0000 0 0 0 0>;
device_type = "pci";
mediatek,mtd-eeprom = <&factory 0x8000>;
mediatek,2ghz = <0>;
};
};
};
ethernet@10100000 {
pinctrl-names = "default";
pinctrl-0 = <&ephy_pins>;
mtd-mac-address = <&factory 0x4>;
ralink,port-map = "llllw";
};
wmac@10180000 {
ralink,mtd-eeprom = <&factory 0>;
};
pinctrl {
state_default: pinctrl0 {
default {
ralink,group = "wled", "i2c", "wdt", "uartf";
ralink,function = "gpio";
};
};
};
gpio-keys-polled {
compatible = "gpio-keys-polled";
#address-cells = <1>;
#size-cells = <0>;
poll-interval = <20>;
reset {
label = "reset";
gpios = <&gpio0 1 1>;
linux,code = <0x198>;
};
wps {
label = "wps";
gpios = <&gpio0 2 1>;
linux,code = <0x211>;
};
};
};
加入 MicroWRT 编译选项有了 MicroWRT 的硬件描述，我们只需要通知 OpenWRT 编译工具进行编译，就可以生成适合 MicroWRT 的固件了。修改 target/linux/ramips/image/Makefile 找到 ifeq ($(SUBTARGET),mt7620) define Image/Build/Profile/Default 在下面加入 $(call Image/Build/Profile/MicroWRT,$(1)) 然后在这个函数上面加入 Image/Build/Profile/MicroWRT=$(call BuildFirmware/Default16M/$(1),$(1),microwrt,MicroWRT) 即可在编译时自动生成 MicroWRT 固件。 网络接口定制(VLAN)MT7620 内置了支持 VLAN 的交换机，通过划分不同的 VLAN 就可以实现内外网的切换。MicroWRT 扩展板提供了一个一以太网口，连接到 Port 4。通常我们会使用这个网口连接外网。此时需要修改固件源码中的 /target/linux/ramips/base-files/etc/board.d/02_network。 找到如下段落： wt1520 | \
xiaomi-miwifi-mini |\
y1)
ucidef_set_interfaces_lan_wan "eth0.1" "eth0.2"
ucidef_add_switch "switch0" "1" "1"
ucidef_add_switch_vlan "switch0" "1" "0 1 2 3 6t"
ucidef_add_switch_vlan "switch0" "2" "4 6t"
;;
这一段就是将 Port 4 配置到 VLAN 2 的代码。 只要把 microwrt 也加进去就好了。 wt1520 | \
xiaomi-miwifi-mini | \
microwrt | \
y1)
ucidef_set_interfaces_lan_wan "eth0.1" "eth0.2"
ucidef_add_switch "switch0" "1" "1"
ucidef_add_switch_vlan "switch0" "1" "0 1 2 3 6t"
ucidef_add_switch_vlan "switch0" "2" "4 6t"
;;
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