Serial Communication Interface Drivers 串行通信接口的驱动程序
The link layer refers to the device drivers providing access to the physical layer, which could be numerous mediums, such as serial links or Ethernet devices.
链路层是指提供对物理层访问的设备驱动程序，这可以是各种介质，例如串口链路或以太网设备。
IrDa chips incompatible with the serial driver have their own device drivers.
与串行驱动器不兼容的IrDa芯片有自己的设备驱动程序。
The Linux source tree provides a drivers subdirectory that is further divided by the various devices that are supported, such as Bluetooth, I2C, serial, and so on.
Linux 源码树提供了一个驱动程序子目录，这个目录又进一步划分为各种支持设备，例如 Bluetooth、I2C、serial 等。
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