mdev自动加/卸载usb存储设备_mdev .cfg-优快云博客

本文链接：https://blog.youkuaiyun.com/transistor0/article/details/16885869

本文介绍如何使用mdev在Linux系统中自动添加和移除USB存储设备，包括相关驱动节点的创建与删除，确保设备的安全、全面和可靠连接。同时提到了Linux内核对S3C2410睡眠模式的支持以及Linux系统的其他技术知识点，如shell、socket编程和线程保护等。

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1、编辑mdev配置文件/etc/mdev.conf,添加如下语句
sd[a-z]*[0-9]    0:0    0660    @(mount -t vfat -o iocharset= cp936 /dev/$MDEV /mnt/udisk)
sd[a-z]*[0-9]    0:0    0660    *(umount /mnt/udisk)

2、内核配置,内核需要支持fat文件系统
File systems --->
    DOS/FAT/NT Filesystems --->
        <*> MSDOS fs support
        <*> VFAT (Windows-95) fs support
        ( 437) Default codepage for FAT
        (iso8859-1) Default iocharset for FAT
    -*- Native language support --->
        (cp437) Default NLS Option
        <M>   Codepage 437 (United States, Canada)
        <M>   Simplified Chinese charset (CP 936, GB2312)
        <M>   ASCII (United States)
        <M>   NLS ISO 8859-1 (Latin 1; Western European Languages)
Device Drivers --->
    SCSI device support --->
        <M> SCSI device support
        <M> SCSI disk support
    [*] USB support --->
        <*>   Support for Host-side USB
        <M>   USB Mass Storage support
        <M>     Realtek Card Reader support
make -j4    #这样才会编译模块
#"-j4"4线程,一般几核心cpu则-j后面就是几。这样可以加快编译速度

3、加载驱动,热拔插realtek读卡器需要的驱动模块,建议按照下面顺序加载
mount -t nfs -o nolock 192.168.0.101:/develop /mnt/develop
insmod /mnt/develop/project/linux-3.1.6/fs/nls/nls_cp 437.ko    #下面4个驱动模块系统字符编码支持,
insmod /mnt/develop/project/linux-3.1.6/fs/nls/nls_ cp936.ko
insmod /mnt/develop/project/linux-3.1.6/fs/nls/nls_ascii.ko        #不是必须
insmod /mnt/develop/project/linux-3.1.6/fs/nls/nls_iso8859-1.ko    #不是必须
insmod /mnt/develop/project/linux-3.1.6/drivers/scsi/scsi_mod.ko   #usb磁盘在linux中被当作scsi设备
insmod /mnt/develop/project/linux-3.1.6/drivers/scsi/sd_mod.ko #很多人都忘记这个模块,读卡器必须
insmod /mnt/develop/project/linux-3.1.6/drivers/usb/storage/usb-storage.ko #usb存储器驱动
insmod /mnt/develop/project/linux-3.1.6/drivers/usb/storage/ums-realtek.ko #realtek读卡器驱动

我的飚王读卡器(用的realtek芯片方案)实例
usb 1-1: new full speed USB device number 11 using s3c2410-ohci
scsi8 : usb-storage 1-1:1.0
scsi 8:0:0:0: Direct-Access     Generic- Multi-Card       1.00 PQ: 0 ANSI: 0 CCS
sd 8:0:0:0: [sda] 15646720 512-byte logical blocks: (8.01 GB/7.46 GiB)
sd 8:0:0:0: [sda] Write Protect is off
sd 8:0:0:0: [sda] No Caching mode page present
sd 8:0:0:0: [sda] Assuming drive cache: write through
sd 8:0:0:0: [sda] No Caching mode page present
sd 8:0:0:0: [sda] Assuming drive cache: write through
sda: sda1
sd 8:0:0:0: [sda] No Caching mode page present
sd 8:0:0:0: [sda] Assuming drive cache: write through
sd 8:0:0:0: [sda] Attached SCSI removable disk
此时读卡器上的sd卡已经挂载到了/mnt/udisk目录

4、卸载读卡器
umount /mnt/udisk或者umount /dev/ sda1

注意:
要运行rmmod命令必须先运行如下命令
mkdir -p /lib/modules/`uname -r`

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