The serial port is a basic communication channel used by a slew of technologies and applications. A chip known as the Universal Asynchronous Receiver Transmitter (UART) is commonly used to implement serial communication. On PC-compatible hardware, the UART is part of the Super I/O chipset, as shown in Figure 6.1.
Figure 6.1. Connection diagram of the PC serial port.
Though RS-232 communication channels are the common type of serial hardware, the kernel’s serial subsystem is architected in a generic manner to serve ...
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