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by farmdve
770 days ago
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This is fine for devices that expose a true JTAG interface. But imagine something like Hitachi's User Debug Interface that exposes only boundary scan. The rest of the protocol is undocumented unless you have specific NDA clearance. In which case a methodology is needed to reverse engineer this protocol, treating the device like a black box. I really liked how a solution to this was found for x86 processors and hidden instructions https://github.com/xoreaxeaxeax/sandsifter |
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