Public bug reported:
I have a Milk-V Mars SBC (StarFive JH7110 SoC). I manually updated the
bootloader to U-Boot v2025.10 (from
https://freeshell.de/e/riscv64/vf2eeprom/) and then installed Ubuntu
Server 24.04.3. Upgrading the bootloader worked very well and allowed me
to run the subiquity installer without any issues.
The Regression:
With kernel 6.8.0 (24.04.3 installer default), the onboard Ethernet
(end0) works perfectly.
After running sudo apt upgrade, the system rebooted into kernel
6.14.0-36-generic, and then the end0 interface failed completely.
Symptoms: The interface appears in ip a, but it cannot negotiate a link
(Link detected: no in ethtool). It seems the Motorcomm PHY driver is
failing to attach or initialize correctly in 6.14.0.
I am currently using a USB-Ethernet adapter (r8152) to bypass the issue.
Hardware Details:
Board: Milk-V Mars
Bootloader: U-Boot v2025.10 (Note: This bootloader works 100% correctly
with Kernel 6.8.0, so the issue is likely not firmware related).
Logs:
1. Kernel Version (Broken)
$ uname -a
Linux moonunit 6.14.0-36-generic #36.1~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed
Oct 22 10:00:37 UTC riscv64 riscv64 riscv64 GNU/Linux
2. Link Status (Down)
$ ip a show end0
2: end0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default
qlen 1000
link/ether 6c:cf:39:00:97:0b brd ff:ff:ff:ff:ff:ff
3. Ethtool (Evidence of PHY Failure) Note: Speed is "Unknown" and Auto-
negotiation is "off".
$ sudo ethtool end0
Settings for end0:
Supported ports: [ TP AUI MII FIBRE BNC Backplane ]
...
Speed: Unknown!
Duplex: Half
Auto-negotiation: off
Link detected: no
4. Dmesg (MAC loads, but no PHY attachment)
$ sudo dmesg | grep -iE "eth|phy|motorcomm|starfive"
[ 6.720517] starfive-dwmac 16030000.ethernet: IRQ sfty not found
[ 6.729272] starfive-dwmac 16030000.ethernet: User ID: 0x41, Synopsys ID:
0x52
[ 6.740711] starfive-dwmac 16030000.ethernet: DWMAC4/5
...
[ 6.892165] starfive-dwmac 16030000.ethernet end0: renamed from eth0
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2134372
Title:
Milk-V Mars / StarFive JH7110 Ethernet (end0) dead after upgrade to
6.14.0-36 (regression from 6.8.0)
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