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From 740fa92fd41e2c4dd5798d462fe4646d0cc6cc48 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>
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