NXP官方linux内核编译
上传到ubuntu
修改顶层Makefile
ARCH ?= $(SUBARCH)
CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
改成
ARCH ?= arm
CROSS_COMPILE ?= arm-linux-gnueabihf-
执行以下指令
make clean
make imx_v7_mfg_defconfig
make -j8
添加自己开发版
-
arch/arm/configs的imx_v7_mfg_defconfig文件进行复制改成aa_wyl_defconfig
-
将aa_wyl_defconfig文件中"CONFIG_ARCH_MULTI_V6=y"注释掉
-
执行make aa_wyl_defconfig
添加设备树文件
cp arch/arm/boot/dts/imx6ul-14x14-evk.dts arch/arm/boot/dts/imx6ull_wyl_defconfig.dts
修改设备树的Makefile
arch/arm/boot/dts/Makefile
找到CONFIG_SOC_IMX6ULL配置添加自己的dtb
dtb-$(CONFIG_SOC_IMX6ULL) += \
imx6ull_wyl_defconfig.dtb \
自己板子编译
make distclean
make aa_wyl_defconfig
make menuconfig
make all -j8
或者
make zImage all -j8
问题修改
/usr/bin/ld: scripts/dtc/dtc-parser.tab.o CC arch/arm/kernel/asm-offsets.s
:(.bss+0x50): multiple definition of `yylloc'; scripts/dtc/dtc-lexer.lex.o:(.bss+0x0): first defined here
collect2: error: ld returned 1 exit status
进入到scripts/dtc/dtc-lexer.l和dtc-lexer.lex.c_shipped
YYLTYPE yylloc;
改成
extern YYLTYPE yylloc;
完成
arch/arm/boot/zImage
arch/arm/boot/dts/imx6ull_wyl_defconfig.dtb
测试
复制zImage和dtb文件到tftp目录
tftp 80800000 zImage
tftp 83000000 imx6ull_wyl_defconfig.dtb
bootz 80800000 - 83000000
CPU主频修改
aa_wyl_defconfig文件中
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_INTERACTIVE=y
第 1 行，配置 ondemand 为默认调频策略。
第 2 行，使能 powersave 策略。
第 3 行，使能 userspace 策略。
第 4 行，使能 interactive 策略。
第 1 行注释掉，然后在 4 行后面添加： CONFIG_CPU_FREQ_GOV_ONDEMAND=y
EMMC改成8数据线
网络驱动修改
在linux中，所有的驱动修改都涉及到设备树，一般改动只会改动设备树文件内容。
源码
pinctrl_spi4: spi4grp {
fsl,pins = <
MX6UL_PAD_BOOT_MODE0__GPIO5_IO10 0x70a1
MX6UL_PAD_BOOT_MODE1__GPIO5_IO11 0x70a1
MX6UL_PAD_SNVS_TAMPER7__GPIO5_IO07 0x70a1
MX6UL_PAD_SNVS_TAMPER8__GPIO5_IO08 0x80000000
>;
};
改成
pinctrl_spi4: spi4grp {
fsl,pins = <
MX6UL_PAD_BOOT_MODE0__GPIO5_IO10 0x70a1
MX6UL_PAD_BOOT_MODE1__GPIO5_IO11 0x70a1
>;
};
源码
spi4 {
compatible = "spi-gpio";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_spi4>;
pinctrl-assert-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>;
status = "okay";
gpio-sck = <&gpio5 11 0>;
gpio-mosi = <&gpio5 10 0>;
cs-gpios = <&gpio5 7 0>;
num-chipselects = <1>;
#address-cells = <1>;
#size-cells = <0>;
gpio_spi: gpio_spi@0 {
compatible = "fairchild,74hc595";
gpio-controller;
#gpio-cells = <2>;
reg = <0>;
registers-number = <1>;
registers-default = /bits/ 8 <0x57>;
spi-max-frequency = <100000>;
};
};
改成
spi4 {
compatible = "spi-gpio";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_spi4>;
status = "okay";
gpio-sck = <&gpio5 11 0>;
gpio-mosi = <&gpio5 10 0>;
num-chipselects = <1>;
#address-cells = <1>;
#size-cells = <0>;
gpio_spi: gpio_spi@0 {
compatible = "fairchild,74hc595";
gpio-controller;
#gpio-cells = <2>;
reg = <0>;
registers-number = <1>;
registers-default = /bits/ 8 <0x57>;
spi-max-frequency = <100000>;
};
};
源码
&iomuxc {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_hog_1>;
imx6ul-evk {
/*省略其他*/
pinctrl_enet1: enet1grp {
fsl,pins = <
MX6UL_PAD_ENET1_RX_EN__ENET1_RX_EN 0x1b0b0
MX6UL_PAD_ENET1_RX_ER__ENET1_RX_ER 0x1b0b0
MX6UL_PAD_ENET1_RX_DATA0__ENET1_RDATA00 0x1b0b0
MX6UL_PAD_ENET1_RX_DATA1__ENET1_RDATA01 0x1b0b0
MX6UL_PAD_ENET1_TX_EN__ENET1_TX_EN 0x1b0b0
MX6UL_PAD_ENET1_TX_DATA0__ENET1_TDATA00 0x1b0b0
MX6UL_PAD_ENET1_TX_DATA1__ENET1_TDATA01 0x1b0b0
MX6UL_PAD_ENET1_TX_CLK__ENET1_REF_CLK1 0x4001b031
>;
};
pinctrl_enet2: enet2grp {
fsl,pins = <
MX6UL_PAD_GPIO1_IO07__ENET2_MDC 0x1b0b0
MX6UL_PAD_GPIO1_IO06__ENET2_MDIO 0x1b0b0
MX6UL_PAD_ENET2_RX_EN__ENET2_RX_EN 0x1b0b0
MX6UL_PAD_ENET2_RX_ER__ENET2_RX_ER 0x1b0b0
MX6UL_PAD_ENET2_RX_DATA0__ENET2_RDATA00 0x1b0b0
MX6UL_PAD_ENET2_RX_DATA1__ENET2_RDATA01 0x1b0b0
MX6UL_PAD_ENET2_TX_EN__ENET2_TX_EN 0x1b0b0
MX6UL_PAD_ENET2_TX_DATA0__ENET2_TDATA00 0x1b0b0
MX6UL_PAD_ENET2_TX_DATA1__ENET2_TDATA01 0x1b0b0
MX6UL_PAD_ENET2_TX_CLK__ENET2_REF_CLK2 0x4001b031
>;
};
}