diff --git a/board/raspberrypi3/config.txt b/board/raspberrypi3/config.txt
index 9f1371c..82a430a 100644
--- a/board/raspberrypi3/config.txt
+++ b/board/raspberrypi3/config.txt
@@ -4,3 +4,9 @@ fixup_file=fixup.dat
 kernel=u-boot.bin
 
 disable_overscan=1
+
+# U-Boot requires a UART port.  There are three options for enabling one:
+# 1. Disable Bluetooth with dtoverlay=disable-bt
+# 2. Swap Bluetooth to the mini UART with dtoverlay=miniuart-bt
+# 3. Enable the mini UART as primary with enable_uart=1
+dtoverlay=disable-bt