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<markdown>
# Kernel Compile

## 命令

* 单独编译Kernel

    ```shell
    ./build.sh -p sun50iw1p1_debian -m kernel -k linux-3.10
    ```

* 清除

    ```
    ./build.sh -p sun50iw1p1_debian -m distclean -k linux-3.10
    ```

* menuconfig

    ```
    sudo make ARCH=arm64 CROSS_COMPILE=../out/sun50iw1p1/debian/common/buildroot/external-toolchain/bin/aarch64-linux-gnu- menuconfig
    ```

* 拷贝

    ```
    scp jay@10.28.3.204:/home/jay/a64/linux-3.10/drivers/net/usb/* ./
    ```

* 更新kernel

    ```bash
    #/bin/bash

    scp jay@10.28.3.204:/home/jay/a64_v4l2/linux-3.10/output/boot.img ./

    [ -f boot.img ] && {

            sudo dd if=boot.img of=/dev/mmcblk0p6 bs=1M
            sync
            echo "update kernel succeed" 
            exit 0 
    }

    echo "update kernel failed"
    exit 1
    ```


## 驱动

### 摄像头(ov5640.ko vfl2.ko )

需要修改vfe.c

```c
//linux-3.10/drivers/media/platform/sunxi-vfe/vfe.c
static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)  {
        struct vfe_dev *dev = video_drvdata(file);

        //*i = dev->input;
        *i = 0;
        return 0;
}
```

```c
//linux-3.10/drivers/media/platform/sunxi-vfe/vfe.c
static int vidioc_enum_input(struct file *file, void *priv, struct v4l2_input *inp) {
         struct vfe_dev *dev = video_drvdata(file);
         if (inp->index > dev->dev_qty-1) {
                 vfe_err("input index(%d) > dev->dev_qty(%d)-1 invalid!\n", inp->index, dev->dev_qty);
                 return -EINVAL;
         }
         vidioc_s_input(file,priv,inp->index);
         if (0 == dev->device_valid_flag[inp->index]) {
                 vfe_err("input index(%d) > dev->dev_qty(%d)-1 invalid!, device_valid_flag[%d] = %d\n",
                         inp->index, dev->dev_qty,inp->index, dev->device_valid_flag[inp->index]);
                 return -EINVAL;
         }
         inp->type = V4L2_INPUT_TYPE_CAMERA;
         return 0;
 }
```

> Device Drivers > Multimedia support > V4L platform devices

![v4l2 编译选项](http://www.leconiot.com/md_res/jaysnote/kernel_compile/images/v4l2.png)

### GPIO libc（built in）

> Device Drivers > GPIO Support 

![GPIO 支持](http://www.leconiot.com/md_res/jaysnote/kernel_compile/images/gpio.png)

### SMT32 I2C& 开机动画（stm_s103.ko）

>Device Drivers > Staging drivers > Support for MXJ private driver

![梦想加私有驱动](http://www.leconiot.com/md_res/jaysnote/kernel_compile/images/mdp_driver.png)

### USB Net(usbnet.ko asix.ko)

> Device Drivers > Network device support > USB Network Adapters

![](http://www.leconiot.com/md_res/jaysnote/kernel_compile/images/usb_net.png)

同时直接干掉无线网卡支持。

### oui mac 和基于sid md5计算mac地址。

* 接收用户传参，用以用户通过应用空间传递oui mac。
```c
//inux-3.10/drivers/char/sunxi_sys_info/chipid-sunxi.c        
static char *user_mac  = "00:00:00:00:00:00";
static bool  user_flag = true;
module_param(user_mac,charp,S_IRUSR);
```
* 如果用户没有传递参数，则通过 sid md5 随机mac；
```c
//inux-3.10/drivers/char/sunxi_sys_info/chipid-sunxi.c        

 #include "linux/cryptohash.h" //for md5
//generate mac by hash cpuid
void hash_gen_mac(u8 *mac){

    u32 data[16] = {0};
        u32 hash[ 4] = {0};

    memset(hash, 0, sizeof(hash));
    memset(data, 0, sizeof(data));

        //1. fill chipid to data
        sunxi_get_soc_chipid((u8*)data);
    //memcpy(data, dat, len);

        printk(KERN_INFO "hash_gen_mac chipid: %08x %08x %08x %08x", data[0], data[1], data[2], data[3]);


        //2. calc md5
    md5_transform(hash, data);
    //hash[0] ^= hash[2];
    //hash[1] ^= hash[3];
        printk(KERN_INFO "hash_gen_mac   hash: %08x %08x %08x %08x", hash[0], hash[1], hash[2], hash[3]);

        //3. fill mac
    memset(mac, 0, ETH_ALEN);

    mac[0] = 0x06; //((0x1<<2) & 0xfe | 0x02); //clr multicast, set local bit// 0x06:*
    //memcpy(&mac[1], hash, 5); 
    memcpy(&mac[1], hash, ETH_ALEN);
}
```

* 业务逻辑
```c
//inux-3.10/drivers/char/sunxi_sys_info/chipid-sunxi.c        
user_flag=true;
printk(KERN_INFO "asix: user mac address is %s",user_mac);
if(user_mac!=NULL&&strlen(user_mac)==17&&strcmp(user_mac,"00:00:00:00:00:00")!=0) {
        for(i=0;i<6;i++) {
                buf[i]=0;
                if(user_mac[3*i]>='0'&&user_mac[3*i]<='9') {
                        buf[i]|=((user_mac[3*i]-'0')*16);
                }else if(user_mac[3*i]>='a'&&user_mac[3*i]<='f') {
                        buf[i]|=((user_mac[3*i]-'a'+10)*16);
                }else if(user_mac[3*i]>='A'&&user_mac[3*i]<='F') {
                        buf[i]|=((user_mac[3*i]-'A'+10)*16);
                }else {
                        user_flag=false;
                        break;
                }
                if(user_mac[3*i+1]>='0'&&user_mac[3*i+1]<='9') {
                        buf[i]|=(user_mac[3*i+1]-'0');
                }else if(user_mac[3*i+1]>='a'&&user_mac[3*i+1]<='f') {
                        buf[i]|=(user_mac[3*i+1]-'a'+10);
                }else if(user_mac[3*i+1]>='A'&&user_mac[3*i+1]<='F') {
                        buf[i]|=(user_mac[3*i+1]-'A'+10);
                }else {
                        user_flag=false;
                        break;
                }

        }
}else {
        user_flag=false;
}
if(user_flag&&((buf[0]&0x0F)%2)==0) {
        printk(KERN_INFO "asix: mac form user setting:%02x:%02x:%02x:%02x:%02x:%02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
}else {
        printk(KERN_INFO "asix: mac form user is null or wrong format. ");
        hash_gen_mac(buf);
        printk(KERN_INFO "asix: mac form chip id hash: %02x:%02x:%02x:%02x:%02x:%02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
}
```

并且需要使能`system info driver`。

> Device Drivers > Character devices 

![系统信息](http://www.leconiot.com/md_res/jaysnote/kernel_compile/images/sys_info.png)

### 显示(built-in)

> Device Drivers > Graphics support > Support for frame buffer devices > Video support for sunxi

![](http://www.leconiot.com/md_res/jaysnote/kernel_compile/images/disp2.png)







### STM32&I2C更新

**19:27 2018/7/31**

更新为源码自带i2c通用驱动，并且更新速率为`100k`

> Device Drivers > I2C support

![](http://www.leconiot.com/md_res/jaysnote/kernel_compile/images/i2c_change.png)



## fex

*  http://linux-sunxi.org/Fex_Guide

</markdown>
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