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The hidden JTAG in a Qualcomm/Snapdragon device’s USB port
Learn about JTAG and EUD
Internally it hooks deep into the SoC, providing debug facilities for not just the CPUs but also the myriad of Hexagon co-processor/DSPs; many of the exciting details can be found in this patent from way back in 2014. In the Qualcomm Landing Team at Linaro, debuggers have never been a staple of our work for all the typical reasons you’d expect (cost and complexity being the main ones), however with more focus being spent on non-kernel things like U-Boot and the secure world this dynamic is shifting. We are particularly interested in the possibilities that EUD opens up for debugging a vertically integrated BSP, especially when TF-A, OP-TEE and U-Boot are in the mix via the Trusted Substrate layer for OpenEmbedded.
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