From 15999223a4eb4d5262d9bc0069e925936c0ab8d9 Mon Sep 17 00:00:00 2001 From: Berkus Decker Date: Tue, 9 Mar 2021 22:03:05 +0200 Subject: [PATCH] Use enable_jtag_gpio config option in the manual Just enabling Alt4 for JTAG GPIO will (no longer) work. --- doc/rpi3_jtag.md | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/doc/rpi3_jtag.md b/doc/rpi3_jtag.md index adb4d4d..8586453 100644 --- a/doc/rpi3_jtag.md +++ b/doc/rpi3_jtag.md @@ -53,16 +53,13 @@ Connecting TDI to pin 7 (GPIO4) did not work! In config.txt: ``` -# Set GPIO pins for JTAG debugger connection on rpi3 -gpio=22-27=a4 -``` - -Alternatively, just specify this: (@todo verify this works with all alt4 pins) - -``` +# Set GPIO pins for JTAG debugger connection on all rpi models enable_jtag_gpio=1 ``` +Quote from [official doc](https://www.raspberrypi.org/documentation/configuration/config-txt/gpio.md): +> Setting enable_jtag_gpio=1 selects Alt4 mode for GPIO pins 22-27, and sets up some internal SoC connections, thus enabling the JTAG interface for the ARM CPU. It works on all models of Raspberry Pi. + ### Wire Connection between boards ```