From 3ece714fc9303210010f32465f7b8e6f504b3b65 Mon Sep 17 00:00:00 2001
From: kettenis <kettenis@openbsd.org>
Date: Tue, 14 Dec 2021 11:01:58 +0000
Subject: [PATCH] Don't overwrite the Raspberry Pi config.txt if it already
 exists.

ok sthen@, jsg@, deraadt@
---
 distrib/arm64/ramdisk/install.md | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/distrib/arm64/ramdisk/install.md b/distrib/arm64/ramdisk/install.md
index 1702dee2f39..d50bee57b8b 100644
--- a/distrib/arm64/ramdisk/install.md
+++ b/distrib/arm64/ramdisk/install.md
@@ -1,4 +1,4 @@
-#	$OpenBSD: install.md,v 1.22 2021/09/26 12:39:25 krw Exp $
+#	$OpenBSD: install.md,v 1.23 2021/12/14 11:01:58 kettenis Exp $
 #
 #
 # Copyright (c) 1996 The NetBSD Foundation, Inc.
@@ -65,12 +65,14 @@ md_installboot() {
 		cp $_mdec/u-boot.bin /mnt/mnt/
 		mkdir -p /mnt/mnt/overlays
 		cp $_mdec/disable-bt.dtbo /mnt/mnt/overlays
-		cat > /mnt/mnt/config.txt<<-__EOT
-			arm_64bit=1
-			enable_uart=1
-			dtoverlay=disable-bt
-			kernel=u-boot.bin
-		__EOT
+		if [[ ! -f /mnt/mnt/config.txt ]]; then
+			cat > /mnt/mnt/config.txt<<-__EOT
+				arm_64bit=1
+				enable_uart=1
+				dtoverlay=disable-bt
+				kernel=u-boot.bin
+			__EOT
+		fi
 		;;
 	esac
 }
-- 
2.20.1