The receiver and transmitter, marked RX and TX respectively, need to connect to a second respective UART device’s TX and RX in order to establish communications. UART works by communicating through two wires (a transmitter wire and a receiver wire) to talk to the microcontroller or system on a chip (basically the brains of the device) directly. UART is used for asynchronous serial communications to send and receive data from devices for purposes such as updating firmware manually, debugging tests, or interfacing with the underlying system (kind of like opening a new terminal in Ubuntu). What is UART?īefore we get into breaking a device and accessing it through its UART interface, let’s first discuss what UART is and how it’s used. We will discuss what UART is, why we would want to access a device through UART, and finally, how to identify and access an arbitrary UART interface on any device. In this post, we will review the process of accessing and dumping the firmware of a device through an alternative serial interface called UART(Universal Asynchronous Receiver-Transmitter). In the first part of my hardware hacking series, we discussed dumping firmware through the SPI flash chip.
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