[FS#4246] x86: AMD embedded SFP+ amd_xgbe no link

[OpenWrt Bugs]

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

User who did this - jochen (pmisch) 

Attached to Project - OpenWrt/LEDE Project
Summary - x86: AMD embedded SFP+ amd_xgbe no link
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I wish to add a new device which "should" be supported but isn't in the list, yet.
It's a Deciso DEC740 with an AMD SoC v1500b. There is also the DEC750, DEC840 and DEC850 which are similar.

There were two commits regarding that SoC:
37958f0d115fe8e9f87091b0242efc2e9ac9c8bf
1c4cd71109d1cec01cf033bc6e26e050726928ea

OpenWrt Nightly starts without errors. In dmesg I can see those lines:
[    9.723673] kmodloader: loading kernel modules from /etc/modules.d/*     
[    9.734152] libphy: amd-xgbe-mii: probed                                   
[    9.739298] amd-xgbe 0000:06:00.1 eth3: net device enabled                 
[    9.741856] urngd: v1.0.2 started.                                         
[    9.745969] libphy: amd-xgbe-mii: probed                                   
[    9.754425] amd-xgbe 0000:06:00.2 eth4: net device enabled  
 

root at OpenWrt:~# cat /etc/openwrt_release 
DISTRIB_ID='OpenWrt'
DISTRIB_RELEASE='SNAPSHOT'
DISTRIB_REVISION='r18681-5d110c0161'
DISTRIB_TARGET='x86/64'
DISTRIB_ARCH='x86_64'
DISTRIB_DESCRIPTION='OpenWrt SNAPSHOT r18681-5d110c0161'
DISTRIB_TAINTS=''


The problem is the links won't come up, no matter what I do . I tried to configure the interfaces in /etc/config/network or via "ip link set up eth3" but nothing happens, even no logs.
When I boot the Hardware with OPNsense (which is the stock firmware for those) the links come up fine.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4246

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