Segger JLink
J-Link is a series of powerful JTAG and SWD debug probes developed by Segger. They are widely used for debugging and programming ARM microcontrollers and other embedded systems. The J-Link debuggers are known for their speed, reliability, and compatibility with a wide range of development tools and environments, making them a preferred choice among embedded developers and hardware pentesters.
Features
Multi-Interface Support
J-Link supports both JTAG and SWD protocols, allowing it to work with various microcontroller architectures.
High-Speed Performance
It offers fast data transfer rates, enabling quicker debugging sessions and programming.
Cross-Platform Compatibility
Works seamlessly with popular IDEs like Keil, IAR Embedded Workbench, and Eclipse.
Extensive Support
Provides a comprehensive software package, including J-Link software and documentation, making it easier to get started.
Cheat Sheet
Example Commands to Dump a Flash Chip Using J-Link
To dump a flash chip using J-Link, you can use the J-Link Command Line Interface (CLI) or the J-Link GDB Server. Below is an example using the J-Link CLI, which is part of the J-Link software package:
Open the Command Prompt (or Terminal on macOS/Linux).
Navigate to the J-Link installation directory where the CLI tool is located, usually found under
C:\Program Files (x86)\SEGGER\JLink
on Windows.Connect the J-Link Debugger to your target device and power it on.
Run the J-Link Command Line Tool:
Connect to the Target Device: In the J-Link Command Line interface, use the following command:
Select the Device: Choose the specific device you are targeting (e.g.,
STM32F4xx
).Select Interface: Choose either
SWD
orJTAG
based on your connection type.Specify the Speed: Set the desired speed (default is usually fine).
Dump the Flash Memory:
<filename.bin>
: The name of the output file where the flash dump will be saved.<start address>
: The starting address of the flash memory you want to dump (e.g.,0x08000000
for STM32).<size>
: The number of bytes to dump (e.g.,0x00040000
for 256KB).
Example:
Exit the J-Link Command Line Tool
Resources
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