[FS#3957] WAN port broken on WNDR3800 (Attachment added)

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - UltraHKR (UltraHKR) 

Attached to Project - OpenWrt/LEDE Project
Summary - WAN port broken on WNDR3800
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Netgear WNDR3800-1CHNAS
 - OpenWrt 21.02-SNAPSHOT r16247-60fad8f82b
 - Steps to reproduce:
  * Flash from stock to OpenWRT 19.07.x ATH79
  * Flash from 19.07.x to OpenWRT 21.02-SNAPSHOT
  * Reset to factory in GUI
  * WAN never comes up, it never leaves "UP BROADCAST MULTICAST" according to ifconfig.
  * WAN port is always flapping, nothing is logged on kernel/system logs.

The hardware was checked before flashing, in OEM firmware WAN is working.

As shown below one of the ports has a blank uid value (full zeros).

(Attached is a full copy of kernel log.

[    1.192635] ag71xx 19000000.eth: connected to PHY at fixed-0:00 [uid=00000000, driver=Generic PHY]
[    1.202218] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: rgmii
[    1.524463] ag71xx 1a000000.eth: connected to PHY at rtl8366s:04 [uid=001cc960, driver=Generic PHY]
[    1.534115] eth1: Atheros AG71xx at 0xba000000, irq 5, mode: rgmii

One or more files have been attached.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3957

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