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+<table class="head">
+ <tr>
+ <td class="head-ltitle">RTW89(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">RTW89(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">rtw89</code> &#x2014; <span class="Nd">Realtek
+ IEEE 802.11ax wireless network driver</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">The driver will auto-load without any user interaction using
+ <a class="Xr">devmatch(8)</a> if enabled in
+ <a class="Xr">rc.conf(5)</a>.</p>
+<p class="Pp">Only if auto-loading is explicitly disabled, place the following
+ lines in <a class="Xr">rc.conf(5)</a> to manually load the driver as a
+ module at boot time:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>kld_list=&quot;${kld_list} if_rtw89&quot;</pre>
+</div>
+<p class="Pp">It is not possible to load the driver from
+ <a class="Xr">loader(8)</a>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">rtw89</code> driver is derived from Realtek's
+ Linux rtw89 driver.</p>
+<p class="Pp">This driver requires firmware to be loaded before it will work.
+ The package <span class="Pa">wifi-firmware-rtw89-kmod</span> from the
+ <span class="Pa">ports/net/wifi-firmware-rtw89-kmod</span> port needs to be
+ installed before the driver is loaded. Otherwise no
+ <a class="Xr">wlan(4)</a> interface can be created using
+ <a class="Xr">ifconfig(8)</a>. One should use <a class="Xr">fwget(8)</a> to
+ install the correct firmware package.</p>
+<p class="Pp" id="linuxkpi_wlan">The driver uses the
+ <a class="permalink" href="#linuxkpi_wlan"><b class="Sy">linuxkpi_wlan</b></a>
+ and
+ <a class="permalink" href="#linuxkpi"><b class="Sy" id="linuxkpi">linuxkpi</b></a>
+ compat framework to bridge between the Linux and native
+ <span class="Ux">FreeBSD</span> driver code as well as to the native
+ <a class="Xr">net80211(4)</a> wireless stack.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
+<p class="Pp">The <code class="Nm">rtw89</code> driver supports PCIe devices
+ with the following chipsets:</p>
+<p class="Pp"></p>
+<ul class="Bl-bullet Bd-indent Bl-compact">
+ <li>Realtek 8851BE Wi-Fi 6 (RTL8851BE)</li>
+ <li>Realtek 8852AE Wi-Fi 6 (RTL8852AE)</li>
+ <li>Realtek 8852BE Wi-Fi 6 (RTL8852BE)</li>
+ <li>Realtek 8852CE Wi-Fi 6E (RTL8852CE)</li>
+ <li>Realtek 8922AE Wi-Fi 7 (RTL8922AE)</li>
+</ul>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="LOADER_TUNABLES"><a class="permalink" href="#LOADER_TUNABLES">LOADER
+ TUNABLES</a></h1>
+<dl class="Bl-tag">
+ <dt id="compat.linuxkpi.skb.mem_limit"><var class="Va">compat.linuxkpi.skb.mem_limit</var></dt>
+ <dd>If you are running a 64bit system with more than 4GB of main memory you
+ need to set this tunable to
+ <a class="permalink" href="#1"><b class="Sy" id="1">1</b></a> in
+ <a class="Xr">loader.conf(5)</a> and reboot once to make it effective.
+ This tunable will work around a problem with DMA and limit allocations for
+ network buffer memory to the lower 32bit of physical memory and make the
+ driver work.</dd>
+</dl>
+</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">wlan(4)</a>, <a class="Xr">networking(7)</a>,
+ <a class="Xr">fwget(8)</a>, <a class="Xr">ifconfig(8)</a>,
+ <a class="Xr">wpa_supplicant(8)</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">rtw89</code> driver first appeared in
+ <span class="Ux">FreeBSD 14.2</span>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
+<p class="Pp">Certainly.</p>
+<p class="Pp">Does not seem to work (reliably) on machines with more than 4GB of
+ main memory. See in the <a class="Sx" href="#LOADER_TUNABLES">LOADER
+ TUNABLES</a> section above.</p>
+<p class="Pp">While <code class="Nm">rtw89</code> supports 802.11a/b/g/n/ac/ax
+ modes, the compatibility code currently only supports 802.11a/b/g modes.
+ Support for 802.11n/ac/ax is yet to come.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">June 13, 2025</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>