slayernoone

주요 부분

#define DRIVER_NAME "axi-radar"

#define DEVICE_NAME "axi-radar"

#define CLASS_NAME  "axiRadarClass"

/* Simple example of how to receive command line parameters to your module.

   Delete if you don't need them */

unsigned myint = 0xdeadbeef;

char *mystr = "default";

/* class */

static struct class* axiRadarClass = NULL;

static struct device* axiRadarDevice = NULL;

...

static int __init axi_radar_init(void)

{   

    printk("<1>AXI-Radar. 1\n");

    printk("<1>Module parameters were (0x%08x) and \"%s\"\n", myint, mystr);

    radar_base_vaddr = 0x00;

    majorNumber = register_chrdev(0, DEVICE_NAME, &fops);

    if (majorNumber< 0) { 

        printk(KERN_ALERT "axi-radar : Registering char device failed with %d\n", majorNumber); 

        return majorNumber;

    } 

    printk(KERN_INFO "axi-radar : major number %d.\n", majorNumber);

    axiRadarClass = class_create(THIS_MODULE, CLASS_NAME);

    if (IS_ERR(axiRadarClass)){                // Check for error and clean up if there is

        unregister_chrdev(majorNumber, DEVICE_NAME);

        printk(KERN_ALERT "axi-radar : Failed to register device class\n");

        return PTR_ERR(axiRadarClass);          // Correct way to return an error on a pointer

    }

    printk(KERN_INFO "axi-radar : device class registered correctly\n");

    // Register the device driver

    axiRadarDevice = device_create(axiRadarClass, NULL, MKDEV(majorNumber, 0), NULL, DEVICE_NAME);

    if (IS_ERR(axiRadarDevice)){               // Clean up if there is an error

        class_destroy(axiRadarClass);           // Repeated code but the alternative is goto statements

        unregister_chrdev(majorNumber, DEVICE_NAME);

        printk(KERN_ALERT "axi-radar : Failed to create the device\n");

        return PTR_ERR(axiRadarDevice);

    }

    return platform_driver_register(&axi_radar_driver);

}

static void __exit axi_radar_exit(void)

{

    device_destroy(axiRadarClass, MKDEV(majorNumber, 0));     // remove the device

    class_unregister(axiRadarClass);                          // unregister the device class

    class_destroy(axiRadarClass);                             // remove the device class

    unregister_chrdev(majorNumber, DEVICE_NAME);             // unregister the major number

    platform_driver_unregister(&axi_radar_driver);

    printk(KERN_ALERT "axi-radar : exit.\n");

}

1. Kernel Update

2. Kernel Boot Script

1. Vivado에서 SDHCI 블럭 Disable 하고 UART0블럭 Enable

2. Vivado - Synth - Implement - Export Hardware ... 순서대로 진행

3. U-Boot 다시 빌드

4. DTSI 수정

~/Xilinx-ZC706-2016.3/subsystems/linux/configs/device-tree/system-top.dts 파일 하기 부분 추가

5. system-cont.dtsi 파일에서 하기 부분 추가

6. 컴파일

7. 확인 방법

U-boot에서 fdt를 사용한다.