Linux编程之杂项技术中怎么去修改内核？

1.删除LCD驱动: 修改/arch/arm/mach-omap2/board-am335xevm.c

2.删除IIC驱动: 修改/arch/arm/mach-omap2/board-am335xevm.c

屏蔽am335x_evm_init(void) am335x_evm_i2c_init();

3.删除Audio驱动: 修改/arch/arm/mach-omap2/devices.c

4.删除摄像头驱动: 修改/arch/arm/mach-omap2/devices.c

屏蔽omap2_init_devices()---omap_init_camera();

（暂不用)增加ADC驱动(目前与触屏冲突,将不能再使用触屏功能)

将CAN0_Tx与CAN0_Rx两个引脚改为开关量输出

5.引脚定义

static struct pinmux_config gpio_led_mux[] = {
    ……
    //-----XSL-----CAN0-->KOUT
{"uart1_ctsn.gpio0_12",OMAP_MUX_MODE7|AM33XX_PIN_OUTPUT},
        {"uart1_rtsn.gpio0_13",OMAP_MUX_MODE7| AM33XX_PIN_OUTPUT},
//-------------
    ……
};

6.引脚导出

static void gpio_led_init(int evm_id, int profile){
……
    //-----XSL-----GPIO EXPORT
    gpio_request(GPIO_TO_PIN(0, 12), "GPIO-OUT1");
    gpio_direction_output(GPIO_TO_PIN(0, 12),1);
    gpio_export(GPIO_TO_PIN(0, 12), 0);
    gpio_request(GPIO_TO_PIN(0, 13), "GPIO-OUT2");
    gpio_direction_output(GPIO_TO_PIN(0, 13),1);
    gpio_export(GPIO_TO_PIN(0, 13), 0);
    //-------------
}

7.将IIC0_SDA与IIC0_SDL两个引脚改为开关量输入

/* pinmux for gpio based key */
static struct pinmux_config gpio_keys_pin_mux[] = {
{"mii1_col.gpio3_0",OMAP_MUX_MODE7|AM33XX_PIN_INPUT},
{"rmii1_refclk.gpio0_29",OMAP_MUX_MODE7|AM33XX_PIN_INPUT},
//-----XSL-----(IIC0-->KEY)
{"i2c0_sda.gpio3_5",    OMAP_MUX_MODE7| AM33XX_PIN_INPUT},
{"i2c0_scl.gpio3_6",    OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},    
//-------------
{NULL, 0},
};
//-----XSL-----删除按键驱动（开发板按键与串口5冲突）
//-------------另：IIC0->KEY，重新开启KEY驱动
{gpio_keys_init,  DEV_ON_BASEBOARD, PROFILE_ALL},
//-------------

8.GPIO做文件输出(执行后就会在文件下有相应文件)

(/sys/class/gpio/gpio101  /sys/class/gpio/gpio 102)
static void gpio_keys_init(int evm_id, int profile)
{
    int err;
 
    setup_pin_mux(gpio_keys_pin_mux);
    err = platform_device_register(&gpio_keys);
    if (err)
        pr_err("failed to register gpio key device\n");
    //-----XSL-----GPIO OUT
    gpio_request(GPIO_TO_PIN(3, 5), "GPIO-KIN1");
    gpio_direction_input(GPIO_TO_PIN(3, 5));
    gpio_export(GPIO_TO_PIN(3, 5), 0);
    gpio_request(GPIO_TO_PIN(3, 6), "GPIO-KIN2");
    gpio_direction_input(GPIO_TO_PIN(3, 6));
    gpio_export(GPIO_TO_PIN(3, 6), 0);
    //-------------
}
 

9.终端测试:

查看状态---cat value