Sounds very interesting.... Please keep us posted!mm0zct_ wrote:I have actually been getting my RPi to work as a JTAG master for an in house platform, not openocd, but I'm gradually writing it up in a rather incoherent tumblr post mm0zct.tumblr.com
I've not finished writing it up yet but it might be useful when I finally do. Soldering together the final logic level converter circuit this weekend.
You need to solder a wire as one of the signals is not brought on either header but you can use JTAG for the ARM processor. See https://github.com/dwelch67/raspberrypi, in particular the armjtag directory.MNM wrote:If my understanding is correct, the JTAG connector on the RPi is a JTAG link going into the RPi (i.e. the TCK, TMS, TDI pins are inputs to the RPi) and the general recommendation is that this JTAG link is not very useful to anyone but the RPi team itself. There is no JTAG connector out of the RPi (i.e. where the TCK, TMS, TDI pins would be outputs from the RPi) so the only way to emulate such a JTAG out link would be by using the GPIOs on the GPIO headers.
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