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: [email protected] {
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