ath79: add support for Arduino Yun

Arduino Yun is a microcontroller development board, based on Atmel
ATmega32u4 and Atheros AR9331.

Specifications:
- MCU: ATmega32U4
- SoC: AR9331
- RAM: DDR2 64MB
- Flash: SPI NOR 16MB
- WiFi:
  - 2.4GHz: SoC internal
- Ethernet: 1x 10/100Mbps
- USB: 1x 2.0
- MicroSD: 1x SDHC

Notes:
- Stock firmware is based on OpenWrt AA.
- The SoC UART can be accessed only through the MCU.
  YunSerialTerminal is recommended for access to serial console.
- Stock firmware uses non-standard 250000 baudrate by default.
- The MCU can be reprogrammed from the SoC with avrdude linuxgpio.

Installation:
1.  Update U-Boot environment variables to adapt to new partition scheme.
    > setenv bootcmd "run addboard; run addtty; run addparts; run addrootfs; bootm 0x9f050000 || bootm 0x9fea0000"
    > setenv mtdparts "spi0.0:256k(u-boot)ro,64k(u-boot-env),15936k(firmware),64k(nvram),64k(art)ro"
    > saveenv
2.  Boot into stock firmware normally and perform sysupgrade with
    sysupgrade image.
    # sysupgrade -n -F /tmp/sysupgrade.bin

Signed-off-by: Sungbo Eo <mans0n@gorani.run>

1 files changed, 6 insertions, 0 deletions

diff --git a/target/linux/ath79/generic/base-files/etc/board.d/02_network b/target/linux/ath79/generic/base-files/etc/board.d/02_network
index 4580f3ab4e..eb43788fce 100755
--- a/target/linux/ath79/generic/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/generic/base-files/etc/board.d/02_network
@@ -12,6 +12,7 @@ ath79_setup_interfaces()
 	adtran,bsap1800-v2|\
 	adtran,bsap1840|\
 	alfa-network,ap121f|\
+	arduino,yun|\
 	aruba,ap-105|\
 	avm,fritz1750e|\
 	avm,fritz300e|\
@@ -361,6 +362,11 @@ ath79_setup_macs()
 	alfa-network,ap121f)
 		label_mac=$(mtd_get_mac_binary art 0x1002)
 		;;
+	arduino,yun)
+		base_mac=$(mtd_get_mac_binary art 0x1002)
+		lan_mac=$(macaddr_setbit $base_mac 29)
+		[ $lan_mac = $base_mac ] && lan_mac=$(macaddr_unsetbit $base_mac 29)
+		;;
 	avm,fritz1750e|\
 	avm,fritz450e|\
 	avm,fritzdvbc)