[source] bcm53xx: fix LAN MAC address for devices that use eth2 originally

[LEDE Commits]

rmilecki pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/d5b53395407ee43c80dbf0fb2a46567cba51033d

commit d5b53395407ee43c80dbf0fb2a46567cba51033d
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Tue Jan 31 13:53:46 2017 +0100

    bcm53xx: fix LAN MAC address for devices that use eth2 originally
    
    We override default Ethernet interface with eth0 which often uses random
    MAC due to missing proper NVRAM entry. Fix this by manually assigning
    MAC in the config.
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 target/linux/bcm53xx/base-files/etc/board.d/02_network | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/linux/bcm53xx/base-files/etc/board.d/02_network b/target/linux/bcm53xx/base-files/etc/board.d/02_network
index 672b134..0a055f4 100755
--- a/target/linux/bcm53xx/base-files/etc/board.d/02_network
+++ b/target/linux/bcm53xx/base-files/etc/board.d/02_network
@@ -50,6 +50,12 @@ netgear,r8500)
 	ifname=eth0
 	ucidef_add_switch "switch0" \
 		"0:lan" "1:lan" "2:lan" "3:lan" "4:wan" "5t@$ifname"
+
+	# These devices should use eth2 so their eth0 interface often has no MAC
+	# assigned. Manually assign eth2's MAC to the LAN.
+	et2macaddr="$(nvram get et2macaddr)"
+	[ -n "$et2macaddr" ] && ucidef_set_interface_macaddr "lan" "$et2macaddr"
+
 	board_config_flush
 	exit 0
 	;;