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Accessing Raspberry Pi JTAG randomly fail [migrated]

I am trying to debug Raspberry Pi 3B (rev 1.2) bare metal application using JTAG. I have no JTAG adapter so I am using another Raspberry Pi (3B rev 1.2) as JTAG adapter. I am using OpenOCD and it ...
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Programming a STM32F407 with a Raspberry PI: No answer on JTDO

Introduction Getting in touch for the first time with an ARM MCU (the STM32F407ZE), I am trying to generate a first working "Hello world!" blinking led. For programming the MCU, it seem possible ...
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How to use RPI 2 to debug RPI model B via JTAG with OpenOCD

I have a RPI 2 that I want to use for programming and debugging a RPI model B over JTAG for a bare metal project. Right now I'm having trouble to get the two boards to even talk to each other over ...