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+<h1>Printing device trees on OpenBSD</h1>
+
+<p>
+I've written a small Perl utility that takes <tt>dmesg</tt> output on
+standard input and produces a human-friendly tree of devices on
+standard output. Since it accepts any <tt>dmesg</tt> output, you can
+use it to produce a tree of hardware on someone else's system as well
+as examine your own.
+</p>
+
+<p>As an example, this is what it looks like on my Lemote Yeeloong:</p>
+
+<code>
+$ dmesg | devtree
+root
+ |-mainbus0 (Lemote Yeeloong)
+ | |-apm0
+ | |-bonito0 (memory and PCI-X controller, rev 1)
+ | | |-pci0 (bus 0)
+ | | |-auglx0 (AMD CS5536 Audio)
+ | | | |-audio0
+ | | |-ehci0 (NEC USB)
+ | | | |-usb0 (USB revision 2.0)
+ | | | |-uhub0 (NEC EHCI root hub)
+ | | |-ehci1 (AMD CS5536 USB)
+ | | | |-usb1 (USB revision 2.0)
+ | | | |-uhub1 (AMD EHCI root hub)
+ | | | |-umass0 (Generic USB2.0-CRW)
+ | | | | |-scsibus0 (2 targets, initiator 0)
+ | | | | |-sd0 (Generic-, Multi-Card, 1.00)
+ | | | |-urtw0 (Realtek RTL8187B)
+ | | |-glxpcib0 (AMD CS5536 ISA)
+ | | | |-glxclk0 (clock, prof)
+ | | | |-gpio1 (32 pins)
+ | | | |-iic (not configured)
+ | | | |-isa0
+ | | | |-mcclock0 (port 0x70/2: mc146818 or compatible)
+ | | | |-pckbc0 (port 0x60/5)
+ | | | | |-pckbd0 (kbd slot)
+ | | | | | |-wskbd0 (console keyboard, using wsdisplay0)
+ | | | | |-pms0 (aux slot)
+ | | | | |-wsmouse0 (mux 0)
+ | | | |-ykbec0 (port 0x381/3)
+ | | |-ohci0 (NEC USB)
+ | | | |-usb2 (USB revision 1.0)
+ | | | |-uhub2 (NEC OHCI root hub)
+ | | |-ohci1 (AMD CS5536 USB)
+ | | | |-usb3 (USB revision 1.0)
+ | | | |-uhub3 (AMD OHCI root hub)
+ | | |-pciide0 (AMD CS5536 IDE)
+ | | | |-wd0 (Corsair Force 3 SSD)
+ | | |-rl0 (Realtek 8139)
+ | | | |-rlphy0 (phy 0: RTL internal PHY)
+ | | |-smfb0 (Silicon Motion LynxEM+)
+ | | |-wsdisplay0 (std, vt100 emulation)
+ | |-cpu0 (STC Loongson2F CPU 796 MHz, STC Loongson2F FPU)
+ |-softraid0
+ | |-scsibus2 (256 targets)
+ |-vscsi0
+ |-scsibus1 (256 targets)
+</code>
+
+<p>Source and a man page are available under the
+<a href="http://git.sjm.so/?p=openbsd-goodies.git;a=tree;f=devtree;hb=HEAD">WTFPL</a>
+from
+<a href="git://git.sjm.so/openbsd-goodies.git">git://git.sjm.so/openbsd-goodies.git</a>
+(or view it on <a href="http://git.sjm.so/?p=openbsd-goodies.git;a=tree;f=devtree;hb=HEAD">GitWeb</a>)
+.
+</p>
+
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