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    ramips: add support for Edimax RA21S · 663b1a14
    Maksym Medvedev authored
    Edimax RA21S is a dual band 11ac router,
    based on MediaTek MT7621A and MT7615N chips.
    
    Specification:
    - SoC: MediaTek MT7621A dual-core @ 880MHz
    - RAM: 256M (Nanya NT5CC128M16IP)
    - FLASH: 16MB (Macronix MX25L12835F)
    - WiFi: 2.4/5 GHz 4T4R
      - 2.4GHz MediaTek MT7615N bgn
      - 5GHz MediaTek MT7615N nac
    - Switch: SoC integrated Gigabit Switch (4 x LAN, 1 x WAN)
    - USB: No
    - BTN: Reset, WPS
    - LED: 4 red LEDs, indistinguishable when case closed
    - UART:  through-hole on PCB.
       J1: 3.3V - RX - GND - TX / 57600-8N1.  3.3V is the square pad
    
    Installation:
    Update the factory image via the OEM web-interface
    (by default: http://192.168.2.1/
    
    )
    User: admin
    Password: 1234
    
    The sysupgrade image can be installed via TFTP
    from the U-Boot bootloader. Connect via ethernet port 2.
    
    Tested on device by @UAb5eSMn
    
    Signed-off-by: default avatarMaksym Medvedev <redrathnure@gmail.com>
    [split DTS and take over improvements from RG21S, extend commit
    message]
    Signed-off-by: default avatarAdrian Schmutzler <freifunk@adrianschmutzler.de>
    663b1a14