From e19ffb25d97e3859693c6d4582caf32e45265aa7 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw2@infradead.org>
Date: Sun, 14 Jun 2020 14:20:36 +0100
Subject: [PATCH] mediatek: store MAC address in boot partition on Banana Pi R2

Like many boards, the Banana Pi R2 doesn't have permanant storage of
its MAC address, and we store the first random one that the kernel
generates in order to use it later and at least be consistent.

Store it in the FAT boot partition, just as the U7623 board (and others)
do.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
---
 .../base-files/lib/preinit/07_set_iface_mac   | 59 +++++++++++--------
 1 file changed, 36 insertions(+), 23 deletions(-)

diff --git a/target/linux/mediatek/mt7623/base-files/lib/preinit/07_set_iface_mac b/target/linux/mediatek/mt7623/base-files/lib/preinit/07_set_iface_mac
index f64458526f..60b699d9c9 100644
--- a/target/linux/mediatek/mt7623/base-files/lib/preinit/07_set_iface_mac
+++ b/target/linux/mediatek/mt7623/base-files/lib/preinit/07_set_iface_mac
@@ -1,23 +1,19 @@
 # Copyright (C) 2018 OpenWrt.org
 
-RECOVERY_PART=/dev/mmcblk0p1
+. /lib/functions.sh
+. /lib/functions/system.sh
 
-preinit_set_mac_address() {
+set_recovery_mac_address() {
+	local RECOVERY_PART="$1"
 	local mac
 
-	. /lib/functions.sh
-	. /lib/functions/system.sh
-
-	case $(board_name) in
-	unielec,u7623-02-emmc-512m)
-		if [ -b $RECOVERY_PART ]; then
-			insmod nls_cp437
-			insmod nls_iso8859-1
-			insmod fat
-			insmod vfat
-			mkdir -p /tmp/recovery
-			mount -o rw,noatime $RECOVERY_PART /tmp/recovery
-
+	if [ -b $RECOVERY_PART ]; then
+		insmod nls_cp437
+		insmod nls_iso8859-1
+		insmod fat
+		insmod vfat
+		mkdir -p /tmp/recovery
+		if mount -o rw,noatime $RECOVERY_PART -t vfat /tmp/recovery; then
 			if [ -f "/tmp/recovery/mac_addr" ];
 			then
 				mac=$(cat /tmp/recovery/mac_addr)
@@ -28,17 +24,34 @@ preinit_set_mac_address() {
 
 			sync
 			umount /tmp/recovery
-			rm -rf /tmp/recovery
-		fi
+			rmdir /tmp/recovery
 
-		ip link set dev wan address $mac 2> /dev/null
+			ip link set dev wan address $mac 2> /dev/null
 
-		mac=$(macaddr_add $mac 1)
+			mac=$(macaddr_add $mac 1)
 
-		ip link set dev lan0 address $mac 2>/dev/null
-		ip link set dev lan1 address $mac 2>/dev/null
-		ip link set dev lan2 address $mac 2>/dev/null
-		ip link set dev lan3 address $mac 2>/dev/null
+			ip link set dev lan0 address $mac 2>/dev/null
+			ip link set dev lan1 address $mac 2>/dev/null
+			ip link set dev lan2 address $mac 2>/dev/null
+			ip link set dev lan3 address $mac 2>/dev/null
+		fi
+	fi
+}
+
+preinit_set_mac_address() {
+	local rootpart
+
+	case $(board_name) in
+	bananapi,bpi-r2)
+		rootpart=$(cat /proc/cmdline)
+		rootpart="${rootpart##*root=}"
+		rootpart="${rootpart%%p3 *}"
+		if [ "$rootpart" = "/dev/mmcblk0" -o "$rootpart" = "/dev/mmcblk1" ]; then
+			set_recovery_mac_address ${rootpart}p2
+		fi
+		;;
+	unielec,u7623-02-emmc-512m)
+		set_recovery_mac_address /dev/mmcblk0p1
 		;;
 	esac
 }