From b5675f500daff3ef3f904e53a5566aa7dc09b786 Mon Sep 17 00:00:00 2001
From: David Bauer <mail@david-bauer.net>
Date: Sat, 10 Sep 2022 01:01:57 +0200
Subject: [PATCH] rockchip: ensure NanoPi R4S has unique MAC address

Ensure the MAC address for all NanoPi R4S boards is assigned unique for
each board.

FriendlyElec ship two versions of the R4S: The standard as well as the
enterprise edition with only the enterprise edition including the EEPROM
chip that stores the unique MAC address.

In order to assign both board types unique MAC addresses, fall back on
the same method used for the NanoPi R2S in case the EEPROM chip is not
present by generating the board MAC from the SD card CID.

[0] https://wiki.friendlyelec.com/wiki/index.php/NanoPi_R4S#Differences_Between_R4S_Standard_Version_.26_R4S_Enterprise_Version

Signed-off-by: David Bauer <mail@david-bauer.net>
---
 .../armv8/base-files/etc/board.d/02_network   | 33 ++++++++++++++++---
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/target/linux/rockchip/armv8/base-files/etc/board.d/02_network b/target/linux/rockchip/armv8/base-files/etc/board.d/02_network
index 91bdb760d5..b0e6479947 100644
--- a/target/linux/rockchip/armv8/base-files/etc/board.d/02_network
+++ b/target/linux/rockchip/armv8/base-files/etc/board.d/02_network
@@ -17,13 +17,36 @@ rockchip_setup_interfaces()
 	esac
 }
 
-nanopi_r2s_generate_mac()
+generate_mac_from_mmc_cid()
 {
-	local sd_hash=$(sha256sum /sys/class/block/mmcblk0/device/cid)
+	local mmc_dev=$1
+
+	local sd_hash=$(sha256sum /sys/class/block/$mmc_dev/device/cid)
 	local mac_base=$(macaddr_canonicalize "$(echo "${sd_hash}" | dd bs=1 count=12 2>/dev/null)")
 	echo "$(macaddr_unsetbit_mc "$(macaddr_setbit_la "${mac_base}")")"
 }
 
+nanopi_r4s_get_mac()
+{
+	local interface=$1
+	local eeprom_path="/sys/bus/i2c/devices/2-0051/eeprom"
+	local address
+
+	if [ -f "$eeprom_path" ]; then
+		address=$(get_mac_binary "$eeprom_path" 0xfa)
+		if [ "$interface" = "lan" ]; then
+			address=$(macaddr_setbit_la "$address")
+		fi
+	else
+		address=$(generate_mac_from_mmc_cid mmcblk1)
+		if [ "$interface" = "lan" ]; then
+			address=$(macaddr_add "$address" 1)
+		fi
+	fi
+
+	echo "$address"
+}
+
 rockchip_setup_macs()
 {
 	local board="$1"
@@ -33,12 +56,12 @@ rockchip_setup_macs()
 
 	case "$board" in
 	friendlyarm,nanopi-r2s)
-		wan_mac=$(nanopi_r2s_generate_mac)
+		wan_mac=$(generate_mac_from_mmc_cid mmcblk0)
 		lan_mac=$(macaddr_add "$wan_mac" 1)
 		;;
 	friendlyarm,nanopi-r4s)
-		wan_mac=$(get_mac_binary "/sys/bus/i2c/devices/2-0051/eeprom" 0xfa)
-		lan_mac=$(macaddr_setbit_la "$wan_mac")
+		wan_mac=$(nanopi_r4s_get_mac wan)
+		lan_mac=$(nanopi_r4s_get_mac lan)
 		;;
 	esac
 
-- 
2.30.2