From b5f94355a0547b2ea47d558dfe6ea5566d3f8dfb Mon Sep 17 00:00:00 2001
From: Liangbin Lian <jjm2473@gmail.com>
Date: Fri, 2 Aug 2024 13:03:03 +0800
Subject: [PATCH] target/bcm27xx: fix custom boot config reset on upgrade

Fix #1721
---
 .../linux/bcm27xx/base-files/lib/upgrade/platform.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/target/linux/bcm27xx/base-files/lib/upgrade/platform.sh b/target/linux/bcm27xx/base-files/lib/upgrade/platform.sh
index df7c0b2cd3..769ddaccce 100644
--- a/target/linux/bcm27xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/bcm27xx/base-files/lib/upgrade/platform.sh
@@ -93,3 +93,15 @@ platform_do_upgrade() {
 	echo "Writing new UUID to /dev/$diskdev..."
 	get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
 }
+
+platform_copy_config() {
+	local partdev
+
+	if export_partdevice partdev 1; then
+		mkdir -p /boot
+		[ -f /boot/kernel.img ] || mount -t vfat -o rw,noatime "/dev/$partdev" /boot
+		tar -C / -zxvf "$UPGRADE_BACKUP" boot/cmdline.txt boot/config.txt
+		sync
+		umount /boot
+	fi
+}