netdev - Marvell 375 and Marvel 88E1514 Phy network problem: mvpp2 or DTS related?

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Message-ID: <wL97kjSJHOArswIoM2huzx9vV9M9uh0SoCZtDVYo-HJFeCwZXraoJ4kc0l1hkxt1XLsejTsRCRCkTqASpo98zAUyfmYoCfzGD3vkaThigVA=@proton.me>
Date: Sun, 21 Sep 2025 09:05:18 +0000
From: Zoo Moo <zoomoo100@...ton.me>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc: Marcin Wojtas <mw@...ihalf.com>, Russell King <linux@...linux.org.uk>
Subject: Marvell 375 and Marvel 88E1514 Phy network problem: mvpp2 or DTS related?

Hi,

Bodhi from Doozan (https://forum.doozan.com) has been helping me try to get Debian to work on a Synology DS215j NAS. The DS215j is based on a Marvell Armada 375 (88F6720) and uses a Marvel 88E1514 PHY.

Even though the eth0 device is detected with the tweaked DTS for the 6.6 kernel. Eth0 can send packets (according to ifconfig and ethtool -S), but nothing is ever received by the device or the router.

Even if I manually set an IP and MAC address for eth0 I cannot detect any packets leaving the DS215j as I cannot ping/telnet/nmap/wireshark the DS215J. There is also no LED activity on the network hub.

The eth0 interfaces works when booting the stock Synology DSM OS which is based on the very old Synology modified 3.x linux kernel. Source is available from:
https://global.synologydownload.com/download/ToolChain/Synology%20NAS%20GPL%20Source/7.1.1-42962/armada375/linux-3.x.txz

However, the Synology kernel does not use DTS and uses a custom build environment.
https://help.synology.com/developer-guide/

Please see the below thread for the gory details of attempting to get DS215j to work:

Debian on Synology DS215j
https://forum.doozan.com/read.php?2,138851

I've created the bugzilla issue with further details:

https://bugzilla.kernel.org/show_bug.cgi?id=220591

Cheers,
ZM

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