Add OpenBSD support

Add a requirements section to the man page which lists the needed access
permissions for each programmer.

This feature needs my pciutils/libpci 8/16-bit write emulation patch at
http://marc.info/?l=openbsd-ports&m=127780030728045 titled
[PATCH] Fix pciutils non-32bit PCI write on OpenBSD

Corresponding to flashrom svn r1067.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stuart Henderson <sthen@openbsd.org>
diff --git a/physmap.c b/physmap.c
index c65df30..bc02007 100644
--- a/physmap.c
+++ b/physmap.c
@@ -229,6 +229,10 @@
 			msg_perr("You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n");
 			msg_perr("disabling the other option unfortunately requires a kernel recompile. Sorry!\n");
 		}
+#elif defined (__OpenBSD__)
+		msg_perr("Please set securelevel=-1 in /etc/rc.securelevel "
+			   "and reboot, or reboot into \n");
+		msg_perr("single user mode.\n");
 #endif
 		if (!mayfail)
 			exit(3);