From d5daa09a0c5f5f6acf6f4445f24aa05c09f3b085 Mon Sep 17 00:00:00 2001
From: David Lechner <david@lechnology.com>
Date: Mon, 27 Jun 2016 22:52:22 -0500
Subject: [PATCH] Add critical information for getting pi3-miniuart-bt overlay
 to work

Bluetooth on RPi 3 using uart1 will not work without setting core_freq=250 in config.txt. This is not
documented anywhere, so this seems like a good place to start.
---
 arch/arm/boot/dts/overlays/README | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -691,7 +691,9 @@ Info:   Switch Pi3 Bluetooth function to
         N.B. It is also necessary to edit /lib/systemd/system/hciuart.service
         and replace ttyAMA0 with ttyS0, unless you have a system with udev rules
         that create /dev/serial0 and /dev/serial1, in which case use
-        /dev/serial1 instead because it will always be correct.
+        /dev/serial1 instead because it will always be correct. Furthermore,
+        you must also set core_freq=250 in config.txt or the miniuart will not
+        work.
 Load:   dtoverlay=pi3-miniuart-bt
 Params: <None>
 
