JCG Y2 is an AC1300M router

Hardware specs:
  SoC: MediaTek MT7621AT
  Flash: Winbond W25Q128JVSQ 16MiB
  RAM: Nanya NT5CB128M16 256MiB
  2.4GHz: MT7615D 2x2
  5GHz: MT7615D 2x2
  Ethernet: 1 x WAN and 4 x LAN
  LED: POWER, INTERNET, 2.4G, 5G
  USB: 1 x 3.0
  Button: Reset

Flash instructions:
  Upload factory.bin in stock firmware's upgrade page.
Signed-off-by: NAmadeusGhost <amadeus@jmu.edu.cn>

* treewide: remove support for 'DEVICE_COMPAT' variable

This commit removes support for the DEVICE_COMPAT variable due to it
requires relatively few changes.

* Revert "ramips: disable PORT 5 MAC RX/TX flow control by default"

The TX/RX flow control is not the cause of the TX timeouts issue
Signed-off-by: NChen Minqiang <ptpt52@gmail.com>

* ramips: net/mediatek fix logical error

fe_empty_txd() should return `tx_ring_size - 1` on ring empty, and
return 0 on ring full.
Signed-off-by: NChen Minqiang <ptpt52@gmail.com>

* ramips: net/mediatek disable eee

This disable eee for mt7530 ports, it causes the link down/up
issue, which happens when connecting to 100Mbit switch

Fixes: FS#1449
Signed-off-by: NChen Minqiang <ptpt52@gmail.com>

* ramips: XiaoYu-C5: reuse ralink-eth driver
Co-authored-by: NChen Minqiang <ptpt52@gmail.com>

* ramips: mt7621.dtsi: add missing pinctrl to ethernet node

Add rgmii1_pins (1st GMAC) and mdio_pins to ethernet node
pinctrl to ensure they are set to correct mode

* ramips: kernel: ralink-eth support mt7621
Signed-off-by: NChen Minqiang <ptpt52@gmail.com>

* ramips: some devices use ralink-eth driver

Also re-added mt7621 hwnat support for some devices.
Signed-off-by: NChen Minqiang <ptpt52@gmail.com>
Signed-off-by: NAmadeusGhost <amadeus@openjmu.xyz>

* ramips/mt7621: re-added hwnat support
Co-authored-by: NLGA1150 <dqfext@gmail.com>
Co-authored-by: NChen Minqiang <ptpt52@gmail.com>

* ramips: add support for Dlink DIR-878 A1 DIR-882 A1 Motorola MR2600

* ramips: add support for Dlink DIR-878 A1 DIR-882 A1 Motorola MR2600

* ramips: add support for Dlink DIR-878 A1 DIR-882 A1 Motorola MR2600
Co-authored-by: Nhyy-666 <hyiy666@gmail.com>

Re-add devices: XiaoMi Wifi R3/R4/AC2100, JDCloud
Signed-off-by: NAmadeusGhost <42570690+AmadeusGhost@users.noreply.github.com>

* ramips: add support for Linksys EA7500 v2

* fix build

* fix build

* update build config

This commit fix switch and image config for Redmi AC2100.
Signed-off-by: NAmadeusGhost <amadeus@jmu.edu.cn>

* ramips: increase HiWiFi HC5962 kernel partition to 4M

Increase kernel partition because 2M is insufficient for 4.19
Because the partition changes, previous version of OpenWrt cannot upgrade to this version
Signed-off-by: NDENG Qingfang <dengqf6@mail2.sysu.edu.cn>

* ramips: use all reserved space for HiWiFi HC5962

Idea was from ad6c6361f9f8 ("ath79: enable all space on Netgear ar9344-based WNDR routers")

These stock partitons: "backup", "hw_panic", "overly", firmware_backup", "opt"
do not contain any device-specific data and can be used for /overlay, resulting in
121M space
Users should erase those partitions with command `mtd erase <partition name>` prior to
upgrading to this version
Signed-off-by: NDENG Qingfang <dengqf6@mail2.sysu.edu.cn>
Co-authored-by: NDENG Qingfang <dengqf6@mail2.sysu.edu.cn>

Co-authored-by: NChen Minqiang <ptpt52@gmail.com>

* ramips: add xiaomi_miwifi-r3 support

Specification:
 - CPU: 580 MHz
 - Flash size: 128 MiB NAND
 - RAM size: 128 MiB DDR2
 - Wireless No1: SoC-integrated: MT7620A 2x2 MIMO 802.11b/g/n (2.4 GHz)
 - Wireless No2: On-board chip: MT7612E 2x2 MIMO 802.11a/n/ac (5 GHz)
 - Switch: MT7620 built-in 10/100 switch w/ vlan support
 - USB: 2.0 x1

Flash instructions:
 1. access ssh via https://wiki.openwrt.org/toh/xiaomi/mir3
 2. in ssh:
      nvram set flag_last_success=1
      nvram set boot_wait=on
      nvram set uart_en=1
      nvram commit
      mtd write lede-ramips-mt7620-miwifi-r3-squashfs-kernel1.bin kernel1
      mtd write lede-ramips-mt7620-miwifi-r3-squashfs-rootfs0.bin rootfs0
      reboot

If you want to revert back to stock fw while on LEDE:
  insert usb stick (FAT/FAT32) with stock fw renamed to miwifi.bin
  fw_setenv flag_last_success 0
  power off the device
  hold the reset button and power on the device, keep holding the reset button until yellow led starts blinking.
Signed-off-by: NChen Minqiang <ptpt52@gmail.com>

* ramips: add mt7620-nand driver for NAND flash

This add the mt7620-nand driver
and enable nand ubifs for subtarget mt7620
Signed-off-by: NChen Minqiang <ptpt52@gmail.com>
Co-authored-by: NChen Minqiang <ptpt52@gmail.com>

This commit sync ramips source code from openwrt master.

1. ramips: gsw_mt7621: disable PORT 5 MAC RX/TX flow control by default
2. ramips: allow to set switchdev by board in ramips_set_preinit_iface
3. kernel: fix typos in KernelPackage description

* generic: support mtd-mac-address-ascii

It supports formats of both 001122334455 and 00:11:22:33:44:55
Signed-off-by: NYousong Zhou <yszhou4tech@gmail.com>

* ramips: add JDCloud
Co-authored-by: NYousong Zhou <yszhou4tech@gmail.com>

This may affect wireless and network.

This commit sync ramips from openwrt master, and revert use caldata.sh
so that wireless for some devices can works.

* ramips: XiaoYu-C5 fix to 512MB

* Re-add support for XiaoYu-C5