Re: [PATCH v1 1/1] Platform/RaspberryPi/ConfigDxe: Fix JTAG Pinout for Pi3/4
Copying Andrei on this, as the existing JTAG pinout is not technically incorrect, since GPIO pin 4 can be used for TDI in ALT5 mode, and we are using the relevant ALT mode in the existing code. See https://sysprogs.com/VisualKernel/tutorials/raspberry/jtagsetup/
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As far as I'm concerned, I think it makes sense to use the same ALT mode and have all the JTAG pins grouped, but I'd like to confirm whether we deliberately chose not to use GPIO 26 in order to leave it available for some other purpose, before I approve this patch. If Andrei says he's okay with it, then I see no objection to this change. Regards, /Pete
On 2020.09.14 22:32, Jeff Booher-Kaeding wrote:
Updated the pinout to match the Pi4 datasheet, tested with the RPi4, Pi3 Datasheet has same pinout.
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