ath79: add support for ZyXEL NBG6716

Attention: Kernel partition size has been enlarged to 4MB.
To switch, you must update to latest ar71xx-nand snapshort and flash the
sysupgrade-4M-Kernel.bin:

zcat openwrt-ath79-nand-zyxel_nbg6716-squashfs-sysupgrade-4M-Kernel.bin | mtd -r -e ubi write - firmware; reboot -f
You will end up with a fresh config if you do not inject config into the image.

The NBG6716 may come with 128MB or 256MB NAND. ar71xx was able to use all, but
ath79 can only use the first 128MB. Therefore the complete NAND needs to be
overwritten. If not, the old UBI may make problems and lead to reboot loop.

Access the real u-boot shell:
ZyXEL uses a proprietary loader/shell on top of u-boot: "ZyXEL zloader v2.02"
When the device is starting up, the user can enter the the loader shell
by simply pressing a key within the 3 seconds once the following string
appears on the serial console:

|   Hit any key to stop autoboot:  3

The user is then dropped to a locked shell.

|NBG6716> HELP
|ATEN    x[,y]     set BootExtension Debug Flag (y=password)
|ATSE    x         show the seed of password generator
|ATSH              dump manufacturer related data in ROM
|ATRT    [x,y,z,u] RAM read/write test (x=level, y=start addr, z=end addr, u=iterations)
|ATGO              boot up whole system
|ATUR    x         upgrade RAS image (filename)
|NBG6716>

In order to escape/unlock a password challenge has to be passed.
Note: the value is dynamic! you have to calculate your own!

First use ATSE $MODELNAME (MODELNAME is the hostname in u-boot env)
to get the challange value/seed.

|NBG6716> ATSE NBG6716
|012345678901

This seed/value can be converted to the password with the help of this
bash script (Thanks to http://www.adslayuda.com/Zyxel650-9.html authors):

- tool.sh -
ror32() {
  echo $(( ($1 >> $2) | (($1 << (32 - $2) & (2**32-1)) ) ))
}
v="0x$1"
a="0x${v:2:6}"
b=$(( $a + 0x10F0A563))
c=$(( 0x${v:12:14} & 7 ))
p=$(( $(ror32 $b $c) ^ $a ))
printf "ATEN 1,%X\n" $p
- end of tool.sh -

|# bash ./tool.sh 012345678901
|
|ATEN 1,879C711

copy and paste the result into the shell to unlock zloader.

|NBG6716> ATEN 1,0046B0017430

If the entered code was correct the shell will change to
use the ATGU command to enter the real u-boot shell.

|NBG6716> ATGU
|NBG6716#

Signed-off-by: André Valentin <avalentin@marcant.net>

5 files changed, 21 insertions, 1 deletions

diff --git a/target/linux/ath79/base-files/etc/board.d/02_network b/target/linux/ath79/base-files/etc/board.d/02_network
index c40c07a906..b5209f7014 100755
--- a/target/linux/ath79/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/base-files/etc/board.d/02_network
@@ -304,6 +304,10 @@ ath79_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"0@eth0" "3:lan:1" "4:lan:2"
 		;;
+	zyxel,nbg6716)
+		ucidef_add_switch "switch0" \
+			"0@eth0" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "6@eth1"
+		;;
 	*)
 		ucidef_set_interfaces_lan_wan "eth0" "eth1"
 		;;
@@ -443,6 +447,10 @@ ath79_setup_macs()
 	wd,mynet-wifi-rangeextender)
 		lan_mac=$(nvram get et0macaddr)
 		;;
+	zyxel,nbg6716)
+		lan_mac=$(macaddr_add $(mtd_get_mac_ascii u-boot-env ethaddr) +2)
+		wan_mac=$(macaddr_add $(mtd_get_mac_ascii u-boot-env ethaddr) +3)
+		;;
 	esac
 
 	[ -n "$lan_mac" ] && ucidef_set_interface_macaddr "lan" $lan_mac
diff --git a/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom b/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index 2cd46f8c28..14cfe64a41 100644
--- a/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -47,6 +47,10 @@ case "$FIRMWARE" in
 		caldata_extract "radiocfg" 0x1000 0x440
 		ath9k_patch_mac $(mtd_get_mac_ascii devdata "wlan24mac")
 		;;
+	zyxel,nbg6716)
+		caldata_extract "art" 0x1000 0x440
+		ath9k_patch_mac $(mtd_get_mac_ascii u-boot-env ethaddr)
+		;;
 	*)
 		caldata_die "board $board is not supported yet"
 		;;
diff --git a/target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata b/target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
index b2ec803a72..91e813f121 100644
--- a/target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
+++ b/target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
@@ -113,6 +113,10 @@ case "$FIRMWARE" in
 	ubnt,unifiac-pro)
 		caldata_extract "EEPROM" 0x5000 0x844
 		;;
+	zyxel,nbg6716)
+		caldata_extract "art" 0x5000 0x844
+		ath10kcal_patch_mac $(macaddr_add $(mtd_get_mac_ascii u-boot-env ethaddr) +1)
+		;;
 	esac
 	;;
 "ath10k/pre-cal-pci-0000:00:00.0.bin")
diff --git a/target/linux/ath79/base-files/etc/hotplug.d/ieee80211/00-wifi-migration b/target/linux/ath79/base-files/etc/hotplug.d/ieee80211/00-wifi-migration
index 37a1346fe7..b0a5d79f9d 100644
--- a/target/linux/ath79/base-files/etc/hotplug.d/ieee80211/00-wifi-migration
+++ b/target/linux/ath79/base-files/etc/hotplug.d/ieee80211/00-wifi-migration
@@ -15,7 +15,8 @@ migrate_wifi_path() {
 
 			case "$board" in
 				tplink,archer-c7-v1|\
-				tplink,archer-c7-v2)
+				tplink,archer-c7-v2|\
+				zyxel,nbg6716)
 					path="pci0000:00/0000:00:00.0"
 					WIFI_PATH_CHANGED=1
 				;;
diff --git a/target/linux/ath79/base-files/lib/upgrade/platform.sh b/target/linux/ath79/base-files/lib/upgrade/platform.sh
index 10756abbaf..83c4e78d25 100644
--- a/target/linux/ath79/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ath79/base-files/lib/upgrade/platform.sh
@@ -51,6 +51,9 @@ platform_do_upgrade() {
 	ubnt,routerstation-pro)
 		echo "Sysupgrade disabled due bug FS#2428"
 		;;
+	zyxel,nbg6716)
+		nand_do_upgrade "$1"
+		;;
 	*)
 		default_do_upgrade "$1"
 		;;