mx6ull如何划分30个扩展分区

MX6ULL处理器的扩展分区划分方式与其他Linux系统相同，可以通过以下步骤划分30个扩展分区：

1. 使用fdisk命令创建分区表。输入fdisk /dev/mmcblk0命令，进入fdisk分区工具，创建分区表。

2. 创建主分区。在fdisk中输入n命令，创建一个主分区。根据需要指定分区的起始和结束扇区，以及分区类型。

3. 创建扩展分区。在fdisk中输入n命令，创建一个扩展分区。根据需要指定分区的起始和结束扇区，以及分区类型。

4. 创建逻辑分区。在fdisk中输入n命令，创建逻辑分区。根据需要指定分区的起始和结束扇区，以及分区类型。

5. 重复步骤4，创建30个逻辑分区。

6. 保存分区表。在fdisk中输入w命令，保存分区表。

7. 格式化分区。使用mkfs命令对每个分区进行格式化，例如mkfs.ext4 /dev/mmcblk0p2。

8. 挂载分区。使用mount命令将每个分区挂载到需要的目录。例如mount /dev/mmcblk0p2 /mnt/partition2。

相关问题

写一个mx6ull 的linux lcd 驱动

好的，下面是一个简单的 MX6ULL Linux LCD 驱动框架，仅供参考：

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include <linux/fb.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>

/* MX6ULL LCD 控制器寄存器宏定义 */
#define LCD_CTRL_BASE_ADDRESS 0x12345678

/* LCD 控制器寄存器偏移量 */
#define LCD_CTRL_REG1_OFFSET 0x00
#define LCD_CTRL_REG2_OFFSET 0x04
#define LCD_CTRL_REG3_OFFSET 0x08

/* MX6ULL LCD 驱动数据结构体 */
struct mx6ull_lcd {
    struct fb_info fb_info;
    struct mutex lock;
    void __iomem *regs;
    dma_addr_t dma_addr;
    u32 width;
    u32 height;
    u32 bpp;
};

/* 配置 MX6ULL LCD 控制器 */
static void mx6ull_lcd_controller_config(struct mx6ull_lcd *lcd)
{
    /* 配置控制器寄存器1 */
    writel((readl(lcd->regs + LCD_CTRL_REG1_OFFSET) & ~0x3) | lcd->bpp, lcd->regs + LCD_CTRL_REG1_OFFSET);

    /* 配置控制器寄存器2 */
    writel((readl(lcd->regs + LCD_CTRL_REG2_OFFSET) & ~0xFFFF) | (lcd->width << 16) | lcd->height, lcd->regs + LCD_CTRL_REG2_OFFSET);

    /* 配置控制器寄存器3 */
    // ...

    /* 打开 LCD 控制器 */
    // ...
}

/* MX6ULL LCD 驱动初始化函数 */
static int mx6ull_lcd_driver_probe(struct platform_device *pdev)
{
    struct mx6ull_lcd *lcd;
    struct fb_info *fb_info;

    /* 分配 MX6ULL LCD 驱动数据结构体 */
    lcd = devm_kzalloc(&pdev->dev, sizeof(struct mx6ull_lcd), GFP_KERNEL);
    if (!lcd)
        return -ENOMEM;

    /* 初始化 MX6ULL LCD 驱动数据结构体 */
    lcd->regs = devm_ioremap_resource(&pdev->dev, platform_get_resource(pdev, IORESOURCE_MEM, 0));
    if (IS_ERR(lcd->regs))
        return PTR_ERR(lcd->regs);

    mutex_init(&lcd->lock);

    /* 配置 MX6ULL LCD 控制器 */
    mx6ull_lcd_controller_config(lcd);

    /* 初始化 FB_INFO 结构体 */
    fb_info = &lcd->fb_info;
    fb_info->fbops = &mx6ull_lcd_fb_ops;
    fb_info->screen_base = dma_alloc_coherent(&pdev->dev, lcd->width * lcd->height * lcd->bpp / 8, &lcd->dma_addr, GFP_KERNEL);
    if (!fb_info->screen_base)
        return -ENOMEM;

    fb_info->fix = mx6ull_lcd_fix;
    fb_info->fix.line_length = lcd->width * lcd->bpp / 8;
    fb_info->var = mx6ull_lcd_var;
    fb_info->var.xres = lcd->width;
    fb_info->var.yres = lcd->height;
    fb_info->var.bits_per_pixel = lcd->bpp;
    fb_info->var.red.offset = 16;
    fb_info->var.red.length = 8;
    fb_info->var.green.offset = 8;
    fb_info->var.green.length = 8;
    fb_info->var.blue.offset = 0;
    fb_info->var.blue.length = 8;

    /* 注册 FB 设备 */
    if (register_framebuffer(fb_info) < 0) {
        dma_free_coherent(&pdev->dev, lcd->width * lcd->height * lcd->bpp / 8, fb_info->screen_base, lcd->dma_addr);
        return -EINVAL;
    }

    platform_set_drvdata(pdev, lcd);

    return 0;
}

/* MX6ULL LCD 驱动移除函数 */
static int mx6ull_lcd_driver_remove(struct platform_device *pdev)
{
    struct mx6ull_lcd *lcd = platform_get_drvdata(pdev);
    struct fb_info *fb_info = &lcd->fb_info;

    unregister_framebuffer(fb_info);
    dma_free_coherent(&pdev->dev, lcd->width * lcd->height * lcd->bpp / 8, fb_info->screen_base, lcd->dma_addr);

    return 0;
}

/* MX6ULL LCD 驱动设备树匹配列表 */
static const struct of_device_id mx6ull_lcd_driver_of_match[] = {
    { .compatible = "fsl,imx6ull-lcd", },
    {},
};
MODULE_DEVICE_TABLE(of, mx6ull_lcd_driver_of_match);

/* MX6ULL LCD 驱动平台驱动结构体 */
static struct platform_driver mx6ull_lcd_driver = {
    .probe = mx6ull_lcd_driver_probe,
    .remove = mx6ull_lcd_driver_remove,
    .driver = {
        .name = "mx6ull-lcd",
        .of_match_table = mx6ull_lcd_driver_of_match,
    },
};
module_platform_driver(mx6ull_lcd_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("MX6ULL LCD Driver");

当然，以上代码只是一个简单的框架，具体的实现还需要根据具体的硬件平台和 LCD 控制器来进行相应的修改和实现。

写一个mx6ull 的linux 24c02 驱动

下面是一个简单的 MX6ULL Linux 24C02 EEPROM 驱动框架，仅供参考：

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/device.h>
#include <linux/err.h>

#define EEPROM_ADDR 0x50
#define EEPROM_PAGE_SIZE 8

/* MX6ULL 24C02 EEPROM 驱动数据结构体 */
struct mx6ull_eeprom {
    struct i2c_client *client;
    u8 *buffer;
};

/* MX6ULL 24C02 EEPROM 驱动读函数 */
static int mx6ull_eeprom_read(struct i2c_client *client, u16 addr, u8 *buffer, u32 count)
{
    struct i2c_msg msg[2];
    u8 addr_buf[2];
    int ret;

    addr_buf[0] = addr >> 8;
    addr_buf[1] = addr & 0xFF;

    msg[0].addr = client->addr;
    msg[0].flags = 0;
    msg[0].len = 2;
    msg[0].buf = addr_buf;

    msg[1].addr = client->addr;
    msg[1].flags = I2C_M_RD;
    msg[1].len = count;
    msg[1].buf = buffer;

    ret = i2c_transfer(client->adapter, msg, 2);
    if (ret == 2)
        return 0;

    return -EIO;
}

/* MX6ULL 24C02 EEPROM 驱动写函数 */
static int mx6ull_eeprom_write(struct i2c_client *client, u16 addr, const u8 *buffer, u32 count)
{
    struct i2c_msg msg;
    u8 *buf;
    int ret, wrote = 0;

    buf = kmalloc(EEPROM_PAGE_SIZE + 2, GFP_KERNEL);
    if (!buf)
        return -ENOMEM;

    while (count > 0) {
        u32 chunk_size = min_t(u32, count, EEPROM_PAGE_SIZE);

        buf[0] = addr >> 8;
        buf[1] = addr & 0xFF;
        memcpy(&buf[2], buffer + wrote, chunk_size);

        msg.addr = client->addr;
        msg.flags = 0;
        msg.len = chunk_size + 2;
        msg.buf = buf;

        ret = i2c_transfer(client->adapter, &msg, 1);
        if (ret != 1) {
            kfree(buf);
            return -EIO;
        }

        msleep(5);

        addr += chunk_size;
        wrote += chunk_size;
        count -= chunk_size;
    }

    kfree(buf);
    return 0;
}

/* MX6ULL 24C02 EEPROM 驱动读取函数 */
static ssize_t mx6ull_eeprom_read_from_eeprom(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
    struct mx6ull_eeprom *eeprom = file->private_data;
    int ret;

    if (*ppos + count > 256)
        return -EINVAL;

    mutex_lock(&eeprom->client->dev.mutex);

    ret = mx6ull_eeprom_read(eeprom->client, *ppos, eeprom->buffer, count);
    if (ret == 0) {
        if (copy_to_user(buf, eeprom->buffer, count))
            ret = -EFAULT;
        else
            *ppos += count;
    }

    mutex_unlock(&eeprom->client->dev.mutex);

    return ret;
}

/* MX6ULL 24C02 EEPROM 驱动写入函数 */
static ssize_t mx6ull_eeprom_write_to_eeprom(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
    struct mx6ull_eeprom *eeprom = file->private_data;
    int ret;

    if (*ppos + count > 256)
        return -EINVAL;

    if (copy_from_user(eeprom->buffer, buf, count))
        return -EFAULT;

    mutex_lock(&eeprom->client->dev.mutex);

    ret = mx6ull_eeprom_write(eeprom->client, *ppos, eeprom->buffer, count);
    if (ret == 0)
        *ppos += count;

    mutex_unlock(&eeprom->client->dev.mutex);

    return ret;
}

/* MX6ULL 24C02 EEPROM 驱动文件操作结构体 */
static const struct file_operations mx6ull_eeprom_fops = {
    .owner = THIS_MODULE,
    .read = mx6ull_eeprom_read_from_eeprom,
    .write = mx6ull_eeprom_write_to_eeprom,
};

/* MX6ULL 24C02 EEPROM 驱动设备树匹配列表 */
static const struct of_device_id mx6ull_eeprom_of_match[] = {
    { .compatible = "fsl,imx6ull-eeprom", },
    {},
};
MODULE_DEVICE_TABLE(of, mx6ull_eeprom_of_match);

/* MX6ULL 24C02 EEPROM 驱动 I2C 设备 ID 列表 */
static const struct i2c_device_id mx6ull_eeprom_id[] = {
    { "mx6ull-eeprom", 0 },
    {},
};
MODULE_DEVICE_TABLE(i2c, mx6ull_eeprom_id);

/* MX6ULL 24C02 EEPROM 驱动匹配函数 */
static int mx6ull_eeprom_driver_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
    struct mx6ull_eeprom *eeprom;
    struct device *dev;
    int ret;

    /* 分配 MX6ULL 24C02 EEPROM 驱动数据结构体 */
    eeprom = devm_kzalloc(&client->dev, sizeof(struct mx6ull_eeprom), GFP_KERNEL);
    if (!eeprom)
        return -ENOMEM;

    /* 初始化 MX6ULL 24C02 EEPROM 驱动数据结构体 */
    eeprom->client = client;
    eeprom->buffer = kmalloc(EEPROM_PAGE_SIZE, GFP_KERNEL);
    if (!eeprom->buffer)
        return -ENOMEM;

    /* 注册 MX6ULL 24C02 EEPROM 驱动文件节点 */
    dev = &client->dev;
    if (!devm_create_file(dev, &dev_attr_eeprom)) {
        dev_err(dev, "failed to create sysfs entry\n");
        return -ENOMEM;
    }

    /* 注册 MX6ULL 24C02 EEPROM 驱动文件操作结构体 */
    ret = alloc_chrdev_region(&eeprom->devno, 0, 1, "mx6ull-eeprom");
    if (ret < 0)
        return ret;

    cdev_init(&eeprom->cdev, &mx6ull_eeprom_fops);
    eeprom->cdev.owner = THIS_MODULE;
    ret = cdev_add(&eeprom->cdev, eeprom->devno, 1);
    if (ret < 0)
        goto out_unregister_region;

    device_create(mx6ull_eeprom_class, NULL, eeprom->devno, NULL, "mx6ull-eeprom");

    i2c_set_clientdata(client, eeprom);

    return 0;

out_unregister_region:
    unregister_chrdev_region(eeprom->devno, 1);
    return ret;
}

/* MX6ULL 24C02 EEPROM 驱动移除函数 */
static int mx6ull_eeprom_driver_remove(struct i2c_client *client)
{
    struct mx6ull_eeprom *eeprom = i2c_get_clientdata(client);

    device_destroy(mx6ull_eeprom_class, eeprom->devno);
    cdev_del(&eeprom->cdev);
    unregister_chrdev_region(eeprom->devno, 1);
    kfree(eeprom->buffer);

    return 0;
}

/* MX6ULL 24C02 EEPROM 驱动 I2C 设备结构体 */
static struct i2c_driver mx6ull_eeprom_driver = {
    .driver = {
        .name = "mx6ull-eeprom",
        .of_match_table = mx6ull_eeprom_of_match,
    },
    .probe = mx6ull_eeprom_driver_probe,
    .remove = mx6ull_eeprom_driver_remove,
    .id_table = mx6ull_eeprom_id,
};
module_i2c_driver(mx6ull_eeprom_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("MX6ULL 24C02 EEPROM Driver");

当然，以上代码只是一个简单的框架，具体的实现还需要根据具体的硬件平台和 24C02 EEPROM 来进行相应的修改和实现。