diff -ur /usr/src/share/man/man4/uart.4 src/share/man/man4/uart.4
--- /usr/src/share/man/man4/uart.4	Mon Sep 18 17:24:19 2006
+++ src/share/man/man4/uart.4	Sun Dec 23 12:20:45 2007
@@ -34,13 +34,39 @@
 .Nd driver for Universal Asynchronous Receiver/Transmitter (UART) devices
 .\"
 .Sh SYNOPSIS
+In order to include support for UART, your kernel configuration must
+include following options:
+.Bd -ragged -offset indent
 .Cd "device uart"
+.Ed
 .Pp
-.Cd "device puc"
-.Cd "device uart"
+In case you want to use multiple serial port cards, remember about including
+.Xr puc 4
+or
+.Xr scc 4
+as well. See their respective manual pages for details. To make
+.Xr uart 4
+driver work correctly, your
+.Pa device.hints
+must include following lines (for standard ISA ports):
+.Bd -ragged -offset indent
+.Pa /boot/device.hints :
+.Cd hint.uart.0.at="isa"
+.Cd hint.uart.0.port="0x3f8"
+.Cd hint.uart.0.flags="0x10"
+.Cd hint.uart.0.irq="4"
+.Cd hint.uart.1.at="isa"
+.Cd hint.uart.1.port="0x2f8"
+.Cd hint.uart.1.flags="0x0"
+.Cd hint.uart.1.irq="3"
+.Ed
 .Pp
-.Cd "device scc"
-.Cd "device uart"
+For exact values of
+.Pa hint.uart.*
+variables refer 
+.Xr sio 4
+manual page.
+.Ed
 .\"
 .Sh DESCRIPTION
 The
diff -ur /usr/src/sys/amd64/conf/GENERIC.hints src/sys/amd64/conf/GENERIC.hints
--- /usr/src/sys/amd64/conf/GENERIC.hints	Mon Oct 15 22:19:03 2007
+++ src/sys/amd64/conf/GENERIC.hints	Sun Dec 23 11:36:43 2007
@@ -31,5 +31,21 @@
 hint.sio.3.disabled="1"
 hint.sio.3.port="0x2E8"
 hint.sio.3.irq="9"
+# required by uart(4) driver
+hint.uart.0.at="isa"
+hint.uart.0.port="0x3F8"
+hint.uart.0.flags="0x10"
+hint.uart.0.irq="4"
+hint.uart.1.at="isa"
+hint.uart.1.port="0x2F8"
+hint.uart.1.irq="3"
+hint.uart.2.at="isa"
+hint.uart.2.disabled="1"
+hint.uart.2.port="0x3E8"
+hint.uart.2.irq="5"
+hint.uart.3.at="isa"
+hint.uart.3.disabled="1"
+hint.uart.3.port="0x2E8"
+hint.uart.3.irq="9"
 hint.ppc.0.at="isa"
 hint.ppc.0.irq="7"
diff -ur /usr/src/sys/i386/conf/GENERIC.hints src/sys/i386/conf/GENERIC.hints
--- /usr/src/sys/i386/conf/GENERIC.hints	Mon Oct 15 22:21:09 2007
+++ src/sys/i386/conf/GENERIC.hints	Sun Dec 23 11:34:07 2007
@@ -49,6 +49,22 @@
 hint.sio.3.disabled="1"
 hint.sio.3.port="0x2E8"
 hint.sio.3.irq="9"
+# required by uart(4) driver
+hint.uart.0.at="isa"
+hint.uart.0.port="0x3F8"
+hint.uart.0.flags="0x10"
+hint.uart.0.irq="4"
+hint.uart.1.at="isa"
+hint.uart.1.port="0x2F8"
+hint.uart.1.irq="3"
+hint.uart.2.at="isa"
+hint.uart.2.disabled="1"
+hint.uart.2.port="0x3E8"
+hint.uart.2.irq="5"
+hint.uart.3.at="isa"
+hint.uart.3.disabled="1"
+hint.uart.3.port="0x2E8"
+hint.uart.3.irq="9"
 hint.ppc.0.at="isa"
 hint.ppc.0.irq="7"
 hint.ed.0.at="isa"
diff -ur /usr/src/sys/pc98/conf/GENERIC.hints src/sys/pc98/conf/GENERIC.hints
--- /usr/src/sys/pc98/conf/GENERIC.hints	Wed May 17 23:25:23 2006
+++ src/sys/pc98/conf/GENERIC.hints	Sun Dec 23 11:36:03 2007
@@ -74,6 +74,16 @@
 hint.sio.1.port="0x238"
 hint.sio.1.irq="5"
 hint.sio.1.flags="0x12000000"
+
+# required by uart(4) driver
+hint.uart.0.at="isa"
+hint.uart.0.port="0x030"
+hint.uart.0.irq="4"
+hint.uart.1.at="isa"
+hint.uart.1.port="0x238"
+hint.uart.1.irq="5"
+hint.uart.1.flags="0x12000000"
+
 # PC-9861K, PC-9801-101, MDC-926Rs
 #hint.sio.1.at="isa"
 #hint.sio.1.port="0x0B1"