Fixes #856

This adds support for the TP-Link TL-WR902Ac v1 travel router.

The device is marked as broken due to 64MB which might be insufficient
in certain environments.

Some 32 MB devices like the Nanostation M2 suffer from sudden high loads
combined with a squashfs related OOM reboot:

  logd invoked oom-killer: gfp_mask=0x2420848, order=0, oom_score_adj=0
  CPU: 0 PID: 774 Comm: logd Not tainted 4.4.135 #0
  Stack : 804214dc 00000000 00000001 80480000 8182fa3c 80474803 804028d0 00000306
          804e378c 00001ade 00000040 00000000 00000000 800a7f10 00000006 00000000
          00000000 00000000 804063e0 80c69994 804e6542 800a5e8c 02420848 00000000
          00000001 801fd600 00000000 00000000 00000000 00000000 00000000 00000000
          00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
          ...
  Call Trace:
  [<800721cc>] show_stack+0x54/0x88
  [<800d5468>] dump_header.isra.4+0x48/0x130
  [<800d5c38>] check_panic_on_oom+0x48/0x84
  [<800d5d64>] out_of_memory+0xf0/0x324
  [<800d9888>] __alloc_pages_nodemask+0x6b8/0x724
  [<800d2960>] pagecache_get_page+0x154/0x270
  [<80134cb0>] __getblk_slow+0x15c/0x374
  [<80160418>] squashfs_read_data+0x1c8/0x6e8
  [<80164628>] squashfs_readpage_block+0x32c/0x4d8
  [<801622a4>] squashfs_readpage+0x5bc/0x6d0
  [<800dd030>] __do_page_cache_readahead+0x1f8/0x264
  [<800d479c>] filemap_fault+0x1a8/0x458
  [<800efc1c>] __do_fault+0x64/0xd0
  [<800f2824>] handle_mm_fault+0x4a4/0xb40
  [<80076e98>] __do_page_fault+0x134/0x470
  [<80060820>] ret_from_exception+0x0/0x10

Reduction of the SquashFS blocksize should reduce the problem slightly on
these nodes. The image size will increase slightly but this should be no
problem for ar71xx-generic (in contrast to ar71xx-tiny).

removes cryptic debug messages from kernel ring buffer and
also reduces memory usage by as much as 20-25 MiB.

Support is marked as broken because this device is sold in two variants,
one with 64M RAM and another with 128M. As of now 64M is not enough
for ath10k with 5GHz enabled.
As there is no indication known which variant one will get better mark
it as broken.

Signed-off-by: Christoph Krapp <achterin@googlemail.com>

The dependency line was lost during the rebase of the current master
version.

Fixes: 9d719a2e ("ar71xx: add support for OpenMesh A40/A60 (#1424)")

Adds support for Alfa AP121F USB powered travel router (looks like an USB ethernet adapter).
There is no factory image, but only a sysupgrade file for this router which can be installed using the inbuilt UBoot web interface.
Configure your PC with IP address 192.168.1.2 and connect the router using its RJ45 port. Hold the reset button while powering the device until all LEDs have flashed 3 times simultaneously. You can now access the fallback web interface using a web browser at http://192.168.1.1 and flash the sysupgrade file.

Make ubiquiti-rocket-m a separate device rather than a bullet-m alias to
enable USB support and allow adding devive-specific packages.

This commit adds support for the AVM Fritz!Box 4020 WiFi-router.

SoC:   Qualcomm Atheros QCA9561 (Dragonfly) 750MHz
RAM:   Winbond W971GG6KB-25
FLASH: Macronix MX25L12835F
WiFi:  QCA9561 b/g/n 3x3 450Mbit/s
USB:   1x USB 2.0
IN:    WPS button, WiFi button
OUT:   Power LED green, Internet LED green, WLAN LED green,
       LAN LED green, INFO LED green, INFO LED red
UART:  Header Next to Black metal shield
       Pinout is 3.3V - RX - TX - GND (Square Pad is 3.3V)
       The Serial setting is 115200-8-N-1.

Tested and working:
 - Ethernet (LAN + WAN)
 - WiFi (correct MAC)
 - Installation via EVA bootloader
 - OpenWRT sysupgrade
 - Buttons
 - LEDs

Not working:
 - USB port

Installation via EVA:
In the first seconds after Power is connected, the bootloader will
listen for FTP connections on 169.254.157.1 (Might also be 192.168.178.1). Firmware can be uploaded
like following:

  ftp> quote USER adam2
  ftp> quote PASS adam2
  ftp> binary
  ftp> debug
  ftp> passive
  ftp> quote MEDIA FLSH
  ftp> put openwrt-sysupgrade.bin mtd1

Note that this procedure might take up to two minutes. After transfer is
complete you need to powercycle the device to boot OpenWRT.

Signed-off-by: David Bauer <mail@david-bauer.net>

ar71xx-generic and -tiny benefit most from the optimized kernel, as they
contain all devices with 32MB RAM. We enable CONFIG_GLUON_SPECIALIZE_KERNEL
for all targets using the mips24_kc architecture so packages shared between
targets don't need to be rebuild all the time.

b1205a9211 ar71xx: /lib/ar71xx.sh: add model detection for TP-Link TL-WR810N
fbeae9d891 iptables: make kmod-ipt-debug part of default ALL build
6ea9a702c5 iptables: Fix target TRACE issue
00fa1e4108 curl: fix libcurl/mbedtls async interface
d5278cc48b kernel: bump 4.4 to 4.4.112 for 17.01
2ae0741f3b dnsmasq: backport validation fix in dnssec security fix
58d60bd283 dnsmasq: backport dnssec security fix for 17.01
d626aa005b mountd: bump to git HEAD version
f0336975be kernel: bump 4.4 to 4.4.111 for 17.01
fb6f21c657 kmod-sched-cake: bump to latest cake bake for 17.01
2e8a3bb35f ar71xx: Netgear WNR2000v4: do not include USB packages [17.01]
3fa86282fa build: fix restoring /etc/opkg with PER_DEVICE_ROOTFS
987a7e3175 ramips: fix lenovo newifi-y1 switch and LED config
dbb5ffaed5 ramips: firewrt: indicate boot status via LED

as GLUON_WLAN_MESH now is set by default, ATH10K_PACKAGES is set by default, too

marked as BROKEN for now as it is untested

related issue: #1099

marked as BROKEN for now as it is untested

defaults to 11s, allowing to build devices without IBSS-support

obsoletes GLUON_ATH10K_MESH

BROKEN because of stability issues with 5GHz enabled.

Fixes #1021

These devices have never actually existed; the corresponding support
strings have been removed from the stock firmwares as well.

The Airgateway LR is the same device as the normal Airgateway but with an detachable antenna. The Pro version is a cheap dual band device.

Fixes #1084

Hardware is very similar to Archer C5v1 and C7v2.

Tested factory install and autoupdater.

IBSS Mesh on 2.4 and 5 GHz is working fine.

The only Ethernet Port is used for config mode and afterwards handled
as WAN Port.

The size of the factory images is limited to 4MB, which caused build
failures when many additional packages were included.

Rather than moving the device to ar71xx-tiny, we ignore the factory images
and just build the sysupgrade. This way, the whole flash is usable for
Gluon.

This means that installing Gluon on these devices will now require to flash
a plain LEDE image first, and then upgrading using the Gluon sysupgrade
image.

Fixes #1020

These devices don't have unique MAC addresses with OpenWrt/LEDE at the moment
(see #993).