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commit 437b1c8e9a4fc6dd5660c503773587974d98825b Author: Sven Eckelmann sven@narfation.org Date: Thu Jul 22 10:47:05 2021 +0000

doc: open-mesh/GDB_Linux_snippets

437b1c8e9a4fc6dd5660c503773587974d98825b open-mesh/GDB_Linux_snippets.textile | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/open-mesh/GDB_Linux_snippets.textile b/open-mesh/GDB_Linux_snippets.textile index d43912f1..593e33a3 100644 --- a/open-mesh/GDB_Linux_snippets.textile +++ b/open-mesh/GDB_Linux_snippets.textile @@ -20,14 +20,14 @@ end

h2. Working with external Watchdog over GPIO

-There are various boards on ar71xx which use external watchdogs chips via GPIO. They have to be triggered regularly (every minute or even more often) or otherwise the board will just suddenly reboot. This will of course not work when Linux is no longer in control and kgdb/gdb is the only way to interact with the system. +There are various boards which use external watchdog chips via GPIO. They have to be triggered regularly (every minute or even more often) or otherwise the board will just suddenly reboot. This will of course not work when Linux is no longer in control and kgdb/gdb is the only way to interact with the system.

-But luckily, we can just write manually to the ar71xx registers (every n seconds). We have two possible ways: +But luckily, we can just write manually to the registers (every n seconds). For example on ar71xx, we have two possible ways:

-* write to the clear/set registers -** set bit n in register GPIO_SET (0x1804000C) to set output value to 1 for GPIO n -** set bit n in register GPIO_CLEAR (0x18040010) to set output value to 0 for GPIO n -* overwrite the complete GPIO_OUT (0x18040008) register (which might modify more GPIO bits then required) +# write to the clear/set registers +#* set bit n in register GPIO_SET (0x1804000C) to set output value to 1 for GPIO n +#* set bit n in register GPIO_CLEAR (0x18040010) to set output value to 0 for GPIO n +# overwrite the complete GPIO_OUT (0x18040008) register (which might modify more GPIO bits then required)

We will only demonstrate this here for GPIO 12 with GPIO_SET/GPIO_CLEAR.