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Use enable_jtag_gpio config option in the manual 

Just enabling Alt4 for JTAG GPIO will (no longer) work.
This commit is contained in:
Berkus Decker 2021-03-09 22:03:05 +02:00
parent a86f623df2
commit 15999223a4
1 changed files with 4 additions and 7 deletions
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11
doc/rpi3_jtag.md
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@ -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
```