![]() ![]() We use this pinout to connect the Segger J-Link, which is a full-featured JTAG debugger that is compatible with OpenOCD. Previously, we verified the MIPS EJTAG 14 pinout for the device and identified the 5 primary signals: TCK, TMS, TDO, TDI and TRST (test reset input). We continue our work on the TP-Link Archer C7 | AC1750 dual band wireless router. ![]() If you haven’t already, make sure to check out our previous JTAG posts: in part 1 we provide background on JTAG and in part 2 we share a teardown of a TP-Link AC1750 to demonstrate how to identify and verify a pinout for JTAG. We walk through Open On-Chip Debugger (OpenOCD) and GDB (GNU project debugger), demonstrate how to read and write from memory, and more broadly discuss the impacts of an exposed JTAG interface on production devices. Welcome back to our introduction to hardware hacking 101 and the final installment of the JTAG blog post series! In this post we cover how to communicate with a target device via JTAG once the pinout has been identified. ![]()
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June 2023
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