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-<table class="head">
- <tr>
- <td class="head-ltitle">IMX_WDOG(4)</td>
- <td class="head-vol">Device Drivers Manual (arm)</td>
- <td class="head-rtitle">IMX_WDOG(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">imx_wdog</code> &#x2014; <span class="Nd">device
- driver for the NXP i.MX5 and i.MX6 watchdog timer</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">To compile this driver into the kernel, place the following line
- in your kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">device imxwdt</code></div>
-<p class="Pp">Alternatively, to load the driver as a module at boot time, place
- the following line in <a class="Xr">loader.conf(5)</a>:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>imx_wdog_load=&quot;YES&quot;</pre>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">imx_wdog</code> driver provides
- <a class="Xr">watchdog(4)</a> support for the watchdog timer present on NXP
- i.MX5 and i.MX6 processors. The i.MX watchdog hardware supports programmable
- timeouts ranging from 0.5 to 128 seconds, in half-second increments. Once
- activated, the watchdog hardware cannot be deactivated, but the timeout
- period can be changed to any valid non-zero value.</p>
-<p class="Pp">At power-on, a special 16-second &#x2018;power-down timer&#x2019;
- mode is automatically enabled by the hardware. It will assert the external
- WDOG_B signal, which may be connected to external hardware that causes the
- system to reset or power-down. The power-down timer is often reset by the
- boot loader (typically U-Boot). If the power-down timer is still active at
- the time when the normal watchdog is first enabled, the
- <code class="Nm">imx_wdog</code> driver automatically disables it.</p>
-<p class="Pp">The <code class="Nm">imx_wdog</code> driver supports the FDT
- <var class="Va">fsl,external-reset</var> property by enabling the assertion
- of the WDOG_B external timeout signal when the property is present. When
- running this way, the need to reset the system due to watchdog timeout is
- signaled by driving the WDOG_B line low; some external entity is expected to
- assert the chip's POR pin in response. The <code class="Nm">imx_wdog</code>
- driver attempts to backstop this external reset by scheduling an interrupt
- to occur as well. The interrupt handler waits 1 second for the external
- reset to occur, then it triggers a normal software reset. Note that the
- WDOG_B signal can be configured to use a variety of pins on the chip. For
- the <var class="Va">fsl,external-reset</var> property to be effective, the
- signal must be connected to an appropriate pin by the system's FDT pinctrl
- data.</p>
-<p class="Pp">The <code class="Nm">imx_wdog</code> driver supports the FDT
- <var class="Va">timeout-secs</var> property by enabling the watchdog as soon
- as the driver attaches, using the given timeout value. This extends watchdog
- protection to much of the system startup process, but it still requires that
- <a class="Xr">watchdogd(4)</a> be configured to service the watchdog.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">fdt(4)</a>, <a class="Xr">watchdog(4)</a>,
- <a class="Xr">watchdog(8)</a>, <a class="Xr">watchdogd(8)</a>,
- <a class="Xr">watchdog(9)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">imx_wdog</code> driver first appeared in
- <span class="Ux">FreeBSD 10.0</span>.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">July 7, 2018</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>