From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iNJPc-00015j-C7 for barebox@lists.infradead.org; Wed, 23 Oct 2019 16:23:05 +0000 From: Oleksij Rempel Date: Wed, 23 Oct 2019 18:22:58 +0200 Message-Id: <20191023162259.21895-1-o.rempel@pengutronix.de> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH v5 1/2] Documentation: add watchdog documentation To: barebox@lists.infradead.org Cc: Oleksij Rempel Signed-off-by: Oleksij Rempel --- Documentation/user/user-manual.rst | 1 + Documentation/user/watchdog.rst | 85 ++++++++++++++++++++++++++++++ 2 files changed, 86 insertions(+) create mode 100644 Documentation/user/watchdog.rst diff --git a/Documentation/user/user-manual.rst b/Documentation/user/user-manual.rst index f04981c3f0..41fdb8805c 100644 --- a/Documentation/user/user-manual.rst +++ b/Documentation/user/user-manual.rst @@ -34,6 +34,7 @@ Contents: state random debugging + watchdog * :ref:`search` * :ref:`genindex` diff --git a/Documentation/user/watchdog.rst b/Documentation/user/watchdog.rst new file mode 100644 index 0000000000..7373b81a8d --- /dev/null +++ b/Documentation/user/watchdog.rst @@ -0,0 +1,85 @@ +Watchdog Support +================ + +Barebox Watchdog Functionality +------------------------------ + +Nevertheless, in some cases we are not able to influence the hardware design +anymore or while developing one needs to be able to feed the watchdog to +disable it from within the bootloader. For these scenarios barebox provides the +watchdog framework with the following functionality and at least +``CONFIG_WATCHDOG`` should be enabled: + +Polling +~~~~~~~ + +Watchdog polling/feeding allows to feed the watchdog and keep it running on one +side and to not reset the system on the other side. It is needed on hardware +with short-time watchdogs. For example the Atheros ar9331 watchdog has a +maximal timeout of 7 seconds, so it may reset even on netboot. +Or it can be used on systems where the watchdog is already running and can't be +disabled, an example for that is the watchdog of the i.MX2 series. +This functionally can be seen as a threat, since in error cases barebox will +continue to feed the watchdog even if that is not desired. So, depending on +your needs ``CONFIG_WATCHDOG_POLLER`` can be enabled or disabled at compile +time. Even if barebox was built with watchdog polling support, it is not +enabled by default. To start polling from command line run: + +.. code-block:: console + + wdog0.autoping=1 + +The poller interval is not configurable, but fixed at 500ms and the watchdog +timeout is configured by default to the maximum of the supported values by +hardware. To change the timeout used by the poller, run: + +.. code-block:: console + + wdog0.timeout_cur=7 + +To read the current watchdog's configuration, run: + +.. code-block:: console + + devinfo wdog0 + +The output may look as follows where ``timeout_cur`` and ``timeout_max`` are +measured in seconds: + +.. code-block:: console + + barebox@DPTechnics DPT-Module:/ devinfo wdog0 + Parameters: + autoping: 1 (type: bool) + timeout_cur: 7 (type: uint32) + timeout_max: 10 (type: uint32) + +Use barebox' environment to persist these changes between reboots: + +.. code-block:: console + + nv dev.wdog0.autoping=1 + nv dev.wdog0.timeout_cur=7 + +Boot Watchdog Timeout +~~~~~~~~~~~~~~~~~~~~~ + +With this functionality barebox may start a watchdog or update the timeout of +an already-running one, just before kicking the boot image. It can be +configured temporarily via + +.. code-block:: console + + global boot.watchdog_timeout=10 + +or persistently by + +.. code-block:: console + + nv boot.watchdog_timeout=10 + +where the used value again is measured in seconds. + +On a system with multiple watchdogs, only the first one (wdog0) is affected by +the ``boot.watchdog_timeout`` parameter. + -- 2.23.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox