Linux 自动生成设备节点

1. 创建字符设备生成设备节点2. busybox
Linux System Utilities --->
    [*] mdev
    [*] Support /etc/mdev.conf
    [*] Support command execution at device addition/removal3. kernel
File systems --->
    Pseudo filesystems --->
        [*] sysfs file system support
        [*] Virtual memory file system support （former shm fs）
        [*]   Tmpfs POSIX Access Control Lists4. rootfs
vi ./etc/init.d/rcS
mount -t tmpfs mdev /dev
mkdir /dev/pts
mount -t devpts devpts /dev/pts
mount -t sysfs sysfs /sys
mount -a
echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s