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commit d62b132f1e1fe0852d04e80021748131efc846b3 Author: Sven Eckelmann sven@narfation.org Date: Mon Jul 26 20:04:09 2021 +0000

doc: open-mesh/Kernel_debugging_over_JTAG

d62b132f1e1fe0852d04e80021748131efc846b3 open-mesh/Kernel_debugging_over_JTAG.textile | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/open-mesh/Kernel_debugging_over_JTAG.textile b/open-mesh/Kernel_debugging_over_JTAG.textile index 0f4ca1ae..726e935e 100644 --- a/open-mesh/Kernel_debugging_over_JTAG.textile +++ b/open-mesh/Kernel_debugging_over_JTAG.textile @@ -60,9 +60,7 @@ EOF

h3. Raspberry PI (4 B) adapter board

-The Raspberry PI 4B can be used as a simple adapter board because there are plenty of GPIOs available and OpenOCD is able to control them directly. But it is a rather slow debug adapter compared to one which was specifically build for this purpose. For example a <code>flash read_bank 0 flash.img 0 65536</code> takes 117.896889s. - -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: +The Raspberry PI 4B can be used as a simple adapter board 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:

* GND: Pin 9 * TDO: GPIO17 (Pin 11) @@ -105,7 +103,7 @@ EOF

h3. Bus Pirate adapter board

-The Bus Pirate's SPI pins can also be used for JTAG. But it is an extremely slow debug adapter compared to one which was specifically build for this purpose. +The Bus Pirate's SPI pins can also be used for JTAG. But it is an extremely slow debug adapter compared to the previously mentioned ones. For example a <code>flash read_bank 0 flash.img 0 65536</code> takes TODO-TODO-TODO for the lima board - an Raspberry Pi 4B for example will only need 2 minutes for the same operations.

Just connect: