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commit cc377b4107b38df2f9674aa6193122292a3323ea Author: Sven Eckelmann sven@narfation.org Date: Sat Jul 31 08:38:54 2021 +0000

doc: open-mesh/Kernel_debugging_over_JTAG

cc377b4107b38df2f9674aa6193122292a3323ea open-mesh/Kernel_debugging_over_JTAG.textile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/open-mesh/Kernel_debugging_over_JTAG.textile b/open-mesh/Kernel_debugging_over_JTAG.textile index c3fe0b5f..fa139979 100644 --- a/open-mesh/Kernel_debugging_over_JTAG.textile +++ b/open-mesh/Kernel_debugging_over_JTAG.textile @@ -59,7 +59,6 @@ source [find board/8devices-lima.cfg] EOF </code></pre>

- h3. Raspberry PI (4 B) adapter hardware

The Raspberry PI 4B can be used as a simple adapter hardware because there are plenty of GPIOs available and OpenOCD is able to control them directly. Only the correctly "raw GPIO number for each Pin":https://www.raspberrypi-spy.co.uk/2012/06/simple-guide-to-the-rpi-gpio-heade... has to be found. A good way to connect them (while keeping the SPI pins free for reflashing SPI chips) is: @@ -70,6 +69,8 @@ The Raspberry PI 4B can be used as a simple adapter hardware because there are p * TCK: GPIO22 (Pin 15) * TMS: GPIO23 (Pin 16)

+!/attachments/download/945/jtag-rpi4.svg! + The hardest part is to find the "correct base of the GPIO controller and to set the speed settings":https://openwrt.org/toh/meraki/mr18/jtag

The configuration of the adapter hardware and the target board is also possible since the release of OpenOCD 0.11