第二课--OpenWRT 固件定制

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 参考: 第十三课--MicroWRT_内核树介绍 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。 /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>; }; }; }; 网络接口定制(VLAN) 参考: 第九课--MicroWRT_VLAN_配置 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"  ;;