iTop-4412 SCP 精英版 linux-4.14.12 内核移植（2）

接上一节iTop-4412 SCP 精英版 linux-4.14.12 内核移植（1）

linux-4.14.12中对iTop-4412 SCP 精英版有支持的设备树的，只需要修改一些细节就可以直接使用了，在arch/arm/boot/dts目录下有精英版支持的设备树

（一）修改exynos4412-itop-elite.dts

根据讯为给的开发版原理图，led2接的是gpl2_0的管脚，看图

修改exynos4412-itop-elite.dts文件下的led节点

- gpios = <&gpx1 0 GPIO_ACTIVE_HIGH>;
+ gpios = <&gpl2 0 GPIO_ACTIVE_HIGH>;

注：我这里还改了led灯的默认状态

（二）修改exynos4412-itop-scp-core.dtsi

把 firmware 节点注释了，因为我们的iTop-4412 SCP 精英版 “没有固件”，或者说没有把引导烧进固件，所以直接注释掉

（三）修改exynos4412-itop-scp-core.dtsi

当你编译运行后，你会发现系统会跑飞，怎么解决呢？
你会发现在exynos4412-itop-scp-core.dtsi文件中有 devfreq-events 这样的节点属性

但是这个属性是不能被识别的，原因在识别这个属性的驱动文件里边，
在drivers/devfreq/目录下有歌devfreq-event.c的文件，

这是识别的devfreq-event属性，不是devfreq-events，所以将exynos4412-itop-scp-core.dtsi文件中的devfreq-events改成devfreq-event就行了。
编译烧写之后，你会发现可以进入文件系统了。

（四）解决电平问题（不能正常输入）

虽然能进入文件系统了，但是不能输入，或者说输入有点卡，其实这是电平的问题，怎么解决呢？其实控制台输出的时候就给了提示了

按照这上面的提示数据和scp核心板的原理图中的s5m8767芯片引脚修改就行了

&i2c_1 {#address-cells = <1>;#size-cells = <0>;samsung,i2c-sda-delay = <100>;samsung,i2c-max-bus-freq = <400000>;pinctrl-0 = <&i2c1_bus>;pinctrl-names = "default";status = "okay";s5m8767: s5m8767-pmic@66 {compatible = "samsung,s5m8767-pmic";reg = <0x66>;s5m8767,pmic-buck-default-dvs-idx = <3>;s5m8767,pmic-buck-dvs-gpios = <&gpb 5 GPIO_ACTIVE_HIGH>,<&gpb 6 GPIO_ACTIVE_HIGH>,<&gpb 7 GPIO_ACTIVE_HIGH>;s5m8767,pmic-buck-ds-gpios = <&gpm3 5 GPIO_ACTIVE_HIGH>,<&gpm3 6 GPIO_ACTIVE_HIGH>,<&gpm3 7 GPIO_ACTIVE_HIGH>;/* VDD_ARM */s5m8767,pmic-buck2-dvs-voltage = <1356250>, <1300000>,<1243750>, <1118750>,<1068750>, <1012500>,<956250>, <900000>;/* VDD_INT */s5m8767,pmic-buck3-dvs-voltage = <1000000>, <1000000>,<925000>, <925000>,<887500>, <887500>,<850000>, <850000>;/* VDD_G3D */s5m8767,pmic-buck4-dvs-voltage = <1081250>, <1081250>,<1025000>, <950000>,<918750>, <900000>,<875000>, <831250>;regulators {ldo1_reg: LDO1 {regulator-name = "VDD_ALIVE";regulator-min-microvolt = <1000000>;regulator-max-microvolt = <1000000>;regulator-always-on;regulator-boot-on;op_mode = <1>; /* Normal Mode */};/* SCP uses 1.5v, POP uses 1.2v */ldo2_reg: LDO2 {regulator-name = "VDDQ_M12";regulator-min-microvolt = <1500000>;regulator-max-microvolt = <1500000>;regulator-always-on;regulator-boot-on;op_mode = <1>; /* Normal Mode */};ldo3_reg: LDO3 {regulator-name = "VDDIOAP_18";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo4_reg: LDO4 {regulator-name = "VDDQ_PRE";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo5_reg: LDO5 {regulator-name = "VDD_LDO5";op_mode = <0>; /* Always off Mode */};ldo6_reg: LDO6 {regulator-name = "VDD10_MPLL";regulator-min-microvolt = <1100000>;regulator-max-microvolt = <1100000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo7_reg: LDO7 {regulator-name = "VDD10_XPLL";regulator-min-microvolt = <1100000>;regulator-max-microvolt = <1100000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo8_reg: LDO8 {regulator-name = "VDD10_MIPI";regulator-min-microvolt = <1000000>;regulator-max-microvolt = <1000000>;op_mode = <1>; /* Normal Mode */};ldo9_reg: LDO9 {regulator-name = "VDD33_LCD";regulator-min-microvolt = <3000000>;regulator-max-microvolt = <3000000>;op_mode = <1>; /* Normal Mode */};ldo10_reg: LDO10 {regulator-name = "VDD18_MIPI";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;op_mode = <1>; /* Normal Mode */};ldo11_reg: LDO11 {regulator-name = "VDD18_ABB1";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo12_reg: LDO12 {regulator-name = "VDD33_UOTG";regulator-min-microvolt = <3000000>;regulator-max-microvolt = <3000000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo13_reg: LDO13 {regulator-name = "VDDIOPERI_18";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo14_reg: LDO14 {regulator-name = "VDD18_ABB02";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo15_reg: LDO15 {regulator-name = "VDD10_USH";regulator-min-microvolt = <1000000>;regulator-max-microvolt = <1000000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo16_reg: LDO16 {regulator-name = "VDD18_HSIC";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo17_reg: LDO17 {regulator-name = "VDDIOAP_MMC012_28";regulator-min-microvolt = <2800000>;regulator-max-microvolt = <2800000>;op_mode = <1>; /* Normal Mode */};/* Used by HSIC */ldo18_reg: LDO18 {regulator-name = "VDDIOPERI_28";regulator-min-microvolt = <2800000>;regulator-max-microvolt = <2800000>;regulator-always-on;op_mode = <1>; /* Normal Mode */};ldo19_reg: LDO19 {regulator-name = "VDD_LDO19";op_mode = <0>; /* Always off Mode */};ldo20_reg: LDO20 {regulator-name = "VDD28_CAM";regulator-min-microvolt = <3000000>;regulator-max-microvolt = <3000000>;op_mode = <1>; /* Normal Mode */};ldo21_reg: LDO21 {regulator-name = "VDD28_AF";regulator-min-microvolt = <3000000>;regulator-max-microvolt = <3000000>;op_mode = <1>; /* Normal Mode */};ldo22_reg: LDO22 {regulator-name = "VDDA28_2M";//regulator-min-microvolt = <2800000>;//regulator-max-microvolt = <2800000>;op_mode = <0>; /* Normal Mode */};ldo23_reg: LDO23 {regulator-name = "VDD28_TF";regulator-min-microvolt = <2800000>;regulator-max-microvolt = <2800000>;op_mode = <1>; /* Normal Mode */};ldo24_reg: LDO24 {regulator-name = "VDD33_A31";regulator-min-microvolt = <3000000>;regulator-max-microvolt = <3000000>;op_mode = <1>; /* Normal Mode */};ldo25_reg: LDO25 {regulator-name = "VDD18_CAM";regulator-min-microvolt = <1200000>;regulator-max-microvolt = <1200000>;op_mode = <1>; /* Normal Mode */};ldo26_reg: LDO26 {regulator-name = "VDD18_A31";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;op_mode = <1>; /* Normal Mode */};ldo27_reg: LDO27 {regulator-name = "GPS_1V8";//regulator-min-microvolt = <1800000>;//regulator-max-microvolt = <1800000>;op_mode = <0>; /* Normal Mode */};ldo28_reg: LDO28 {regulator-name = "DVDD12";//regulator-min-microvolt = <1200000>;//regulator-max-microvolt = <1200000>;op_mode = <0>; /* Normal Mode */};buck1_reg: BUCK1 {regulator-name = "vdd_mif";regulator-min-microvolt = <850000>;regulator-max-microvolt   = <1100000>;regulator-always-on;regulator-boot-on;op_mode = <1>; /* Normal Mode */};buck2_reg: BUCK2 {regulator-name = "vdd_arm";regulator-min-microvolt = <850000>;regulator-max-microvolt = <1456250>;regulator-always-on;regulator-boot-on;op_mode = <1>; /* Normal Mode */};buck3_reg: BUCK3 {regulator-name = "vdd_int";regulator-min-microvolt = <875000>;regulator-max-microvolt = <1200000>;regulator-always-on;regulator-boot-on;op_mode = <1>; /* Normal Mode */};buck4_reg: BUCK4 {regulator-name = "vdd_g3d";regulator-min-microvolt = <750000>;regulator-max-microvolt = <1500000>;regulator-always-on;regulator-boot-on;op_mode = <1>; /* Normal Mode */};buck5_reg: BUCK5 {regulator-name = "vdd_m12";regulator-min-microvolt = <750000>;regulator-max-microvolt = <1500000>;regulator-always-on;regulator-boot-on;op_mode = <1>; /* Normal Mode */};buck6_reg: BUCK6 {regulator-name = "vdd12_5m";regulator-min-microvolt = <750000>;regulator-max-microvolt    = <1500000>;regulator-always-on;regulator-boot-on;op_mode = <1>; /* Normal Mode */};buck7_reg: BUCK7 {regulator-name = "pvdd_buck7";regulator-min-microvolt = <2050000>;regulator-max-microvolt = <2050000>;regulator-boot-on;regulator-always-on;op_mode = <1>; /* Normal Mode */};buck8_reg: BUCK8 {regulator-name = "pvdd_buck8";regulator-min-microvolt = <750000>;regulator-max-microvolt  = <1500000>;regulator-boot-on;regulator-always-on;op_mode = <1>; /* Normal Mode */};buck9_reg: BUCK9 {regulator-name = "vddf28_emmc";regulator-min-microvolt = <750000>;regulator-max-microvolt = <3000000>;op_mode = <1>; /* Normal Mode */};};s5m8767_osc: clocks {#clock-cells = <1>;clock-output-names = "s5m8767_ap","s5m8767_cp", "s5m8767_bt";};};
};

再次编译烧写后，就可以正常进入文件系统正常输入了，但是还有歌问题就是，输入命令后不能正常输出，会出现
dma-pl330 12680000.pdma: Reset Channel-4 CS-20000f FTC-20000
这样的错误

（五）解决字符串溢出问题

注：这个我也不知道是怎么回事，就瞎改，然后就解决了

就是把arch/arm/boot/dts/目录下的exynos4.dtsi文件中的串口2节点serial_2中的dmas属性注释掉就可以了，但后来我pdma0 17留着，删了pdma0 18也可以正常运行，具体原因我也不清楚。

重新编译烧写后就可以正常运行linux-4.14.12了

注：这是讯为给的文件系统，脚本写的不规范，以后我会更新，用busybox打造ubuntu版的文件系统