Messages in this thread | | | Subject | Re: [PATCH v13 4/4] Watchdog: introduce ARM SBSA watchdog driver | From | Guenter Roeck <> | Date | Tue, 16 Feb 2016 19:42:56 -0800 |
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On 02/16/2016 09:08 AM, fu.wei@linaro.org wrote: > From: Fu Wei <fu.wei@linaro.org> > > According to Server Base System Architecture (SBSA) specification, > the SBSA Generic Watchdog has two stage timeouts: the first signal (WS0) > is for alerting the system by interrupt, the second one (WS1) is a real > hardware reset. > More details about the hardware specification of this device: > ARM DEN0029B - Server Base System Architecture (SBSA) > > This driver can operate ARM SBSA Generic Watchdog as a single stage watchdog > or a two stages watchdog, it's set up by the module parameter "action". > In the single stage mode, when the timeout is reached, your system > will be reset by WS1. The first signal (WS0) is ignored. > In the two stages mode, when the timeout is reached, the first signal (WS0) > will trigger panic. If the system is getting into trouble and cannot be reset > by panic or restart properly by the kdump kernel(if supported), then the > second stage (as long as the first stage) will be reached, system will be > reset by WS1. This function can help administrator to backup the system > context info by panic console output or kdump. > > This driver bases on linux kernel watchdog framework, so it can get > timeout from module parameter and FDT at the driver init stage. > > Signed-off-by: Fu Wei <fu.wei@linaro.org> > Reviewed-by: Graeme Gregory <graeme.gregory@linaro.org> > Tested-by: Pratyush Anand <panand@redhat.com> > Acked-by: Timur Tabi <timur@codeaurora.org> > Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> > Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
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