Cyclone5 ethernet through FPGA unstable (Kernel 4.14.130-ltsi)

[MGond1]

Hi,

I have custom board with Cyclon5 where I route ethernet through FPGA splitter to PHY. Splitter it built by rather old Quartus 14.1. I got inspired by this example https://rocketboards.org/foswiki/Projects/CycloneVRGMIIExampleDesign

I use latest Buildroot with Busybox to build the image. Ethernet works for kernel 3.10 without any issues. Now I want to update the Kernel to 4.14.130-ltsi (https://github.com/altera-opensource/linux-socfpga/tree/socfpga-4.14.130-ltsi) and issue with ethernet emerged. If I boot up the board first time with one cable to router, everything works fine like this:

[ 2.781695] libphy: Fixed MDIO Bus: probed [ 2.786145] tun: Universal TUN/TAP device driver, 1.6 [ 2.791586] socfpga-dwmac ff700000.ethernet: PTP uses main clock [ 2.797909] socfpga-dwmac ff700000.ethernet: Ring mode enabled [ 2.803750] socfpga-dwmac ff700000.ethernet: DMA HW capability register supported [ 2.811214] socfpga-dwmac ff700000.ethernet: Enhanced/Alternate descriptors [ 2.818170] socfpga-dwmac ff700000.ethernet: Extended descriptors not supported [ 2.825462] socfpga-dwmac ff700000.ethernet: RX Checksum Offload Engine supported [ 2.832926] socfpga-dwmac ff700000.ethernet: COE Type 2 [ 2.838143] socfpga-dwmac ff700000.ethernet: TX Checksum insertion supported [ 2.855289] libphy: stmmac: probed [ 2.858719] Micrel KSZ9021 Gigabit PHY stmmac-0:01: attached PHY driver [Micrel KSZ9021 Gigabit PHY] (mii_bus:phy_addr=stmmac-0:01, irq=POLL) ... Starting network: udhcpc: started, v1.31.0 udhcpc: sending discover udhcpc: sending discover udhcpc: sending select for 192.168.2.222 udhcpc: lease of 192.168.2.222 obtained, lease time 86400 deleting routers adding dns 192.168.2.1 OK# ethtool eth0 Settings for eth0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Link partner advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Link partner advertised pause frame use: Symmetric Receive-only Link partner advertised auto-negotiation: Yes Link partner advertised FEC modes: Not reported Speed: 100Mb/s Duplex: Full Port: MII PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: d Wake-on: d Current message level: 0x0000003f (63) drv probe link timer ifdown ifup Link detected: yes

But when I run "reboot" to soft-reboot the board, PHY is not found. Like this:

[ 2.779583] libphy: Fixed MDIO Bus: probed [ 2.784038] tun: Universal TUN/TAP device driver, 1.6 [ 2.789496] socfpga-dwmac ff700000.ethernet: PTP uses main clock [ 2.795803] stmmac - user ID: 0x10, Synopsys ID: 0x37 [ 2.800868] socfpga-dwmac ff700000.ethernet: Ring mode enabled [ 2.806696] socfpga-dwmac ff700000.ethernet: DMA HW capability register supported [ 2.814163] socfpga-dwmac ff700000.ethernet: Enhanced/Alternate descriptors [ 2.821120] socfpga-dwmac ff700000.ethernet: Enabled extended descriptors [ 2.827893] socfpga-dwmac ff700000.ethernet: RX Checksum Offload Engine supported [ 2.835358] socfpga-dwmac ff700000.ethernet: COE Type 2 [ 2.840576] socfpga-dwmac ff700000.ethernet: TX Checksum insertion supported [ 2.847619] socfpga-dwmac ff700000.ethernet: Enable RX Mitigation via HW Watchdog Timer [ 2.862852] libphy: stmmac: probed [ 2.866270] socfpga-dwmac ff700000.ethernet: No PHY found [ 2.871711] socfpga-dwmac ff700000.ethernet: stmmac_dvr_probe: MDIO bus (id: 0) registration failed [ 2.881261] stmmaceth ff700000.ethernet: PTP uses main clock [ 2.887093] stmmaceth ff700000.ethernet: Ring mode enabled [ 2.892589] stmmaceth ff700000.ethernet: DMA HW capability register supported [ 2.899715] stmmaceth ff700000.ethernet: Enhanced/Alternate descriptors [ 2.906317] stmmaceth ff700000.ethernet: Extended descriptors not supported [ 2.913265] stmmaceth ff700000.ethernet: RX Checksum Offload Engine supported [ 2.920384] stmmaceth ff700000.ethernet: COE Type 2 [ 2.925256] stmmaceth ff700000.ethernet: TX Checksum insertion supported [ 2.939189] libphy: stmmac: probed [ 2.942605] stmmaceth ff700000.ethernet: No PHY found [ 2.947694] stmmaceth ff700000.ethernet: stmmac_dvr_probe: MDIO bus (id: 0) registration failed ... Starting network: Waiting for interface eth0 to appear............... timeout! run-parts: /etc/network/if-pre-up.d/wait_iface: exit status 1 FAIL

Also when Ethernet is up and running and I issue "ip link set eth0 down" the board is rebooted immediately, as if watchdog would reboot the board. The same happens when I unplug the eth cable but I guess, the reason is "ip link set eth0 down" is executed by ifplugd which causing the reboot.

Last nail to the coffin appears when I plug the board to network through the switch (board -> switch -> router). Ethernet wouldn't pick the dhcp and remains unconfigured without ip.

# ethtool eth0 Settings for eth0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 100baseT/Full Advertised pause frame use: No Advertised auto-negotiation: No Advertised FEC modes: Not reported Speed: 100Mb/s Duplex: Full Port: MII PHYAD: 1 Transceiver: internal Auto-negotiation: off Supports Wake-on: d Wake-on: d Current message level: 0x0000003f (63) drv probe link timer ifdown ifup Link detected: yes

I tried to lower PHY speed to 100Mb, doesn't help.

I attached the .dts file, global config and linux .config below. If you have any idea how to proceed with debugging or what is wrong, please, let me know.

Thank you.

[bekl]

I have a similar Problem. Custom board with Cyclon5. Quartuns 14.1 used for hardware design. Preloader and u-boot genrated with 14.1 (u-boot 2013.1). Using Yocto Project like described on rocketboards i can generate a rootfs. My Kernel was alswas 3.10-ltsi-rt which wors fine with yocto 2.0 and yocto 2.7 e.g. When i compile a new kernel now (>4.x) and replace my existing kernel i have problem with eth0.

while boot searial terminal shows something like:

stmmaceth ff700000.ethernet eth0: stmmac_open: Cannot attach to PHY (error: -19)

ifconfig just shows loopback interface.

ip link show shows also eth0:

 eth0: <BROADCAST,MULTICAST8000> mtu 1500 qdisc noop qlen 1000

  link/ether 2e:76:4d:e6:80:14 brd ff:ff:ff:ff:ff:ff

When running ip link set up eth0 i get following error:

stmmaceth ff700000.ethernet eth0: stmmac_open: Cannot attach to PHY (error: -19)

ip: SIOCSIFFLAGS: No such device

Using a newer u-boot than 2013 is also problematic cause then my board does not even boot. I thought that i maybe need to regenerate the preloader and dtb file and so on. But i got some issues there as well therefore i try to run with u-boot 2013 further.

So if you have a solution for your problem maybe it could also resolve mine. I have tried 5-10 different kernels >4.x. Kernel up to <4.0 work fine.

Thanks in advance.

Best regards