AM335x + SMSC 9303 ethernet connection loss

I'm having the similar issue with AM335x + BCM5325.

To bright the Ethernet connection back I have to use ifdown and ifup.

Does anybody have any clue?

------------[ cut here ]------------
[ 137.059219] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:264 dev_watchdog+0x240/0x260()
[ 137.068115] NETDEV WATCHDOG: eth0 (cpsw): transmit queue 0 timed out
[ 137.074806] Modules linked in:
[ 137.078030] CPU: 0 PID: 0 Comm: swapper Not tainted 3.15.5+ #33
[ 137.084294] [<c0013db4>] (unwind_backtrace) from [<c0011c3c>] (show_stack+0x10/0x14)
[ 137.092477] [<c0011c3c>] (show_stack) from [<c003b120>] (warn_slowpath_common+0x68/0x88)
[ 137.101018] [<c003b120>] (warn_slowpath_common) from [<c003b1d4>] (warn_slowpath_fmt+0x30/0x40)
[ 137.110184] [<c003b1d4>] (warn_slowpath_fmt) from [<c067f550>] (dev_watchdog+0x240/0x260)
[ 137.118825] [<c067f550>] (dev_watchdog) from [<c0045890>] (call_timer_fn+0x3c/0x108)
[ 137.126999] [<c0045890>] (call_timer_fn) from [<c0045c38>] (run_timer_softirq+0x1b4/0x290)
[ 137.135718] [<c0045c38>] (run_timer_softirq) from [<c003ed74>] (__do_softirq+0x90/0x284)
[ 137.144234] [<c003ed74>] (__do_softirq) from [<c003f1b4>] (irq_exit+0x9c/0xe8)
[ 137.151850] [<c003f1b4>] (irq_exit) from [<c000f6c0>] (handle_IRQ+0x34/0x84)
[ 137.159289] [<c000f6c0>] (handle_IRQ) from [<c00085b8>] (omap3_intc_handle_irq+0x84/0x9c)
[ 137.167919] [<c00085b8>] (omap3_intc_handle_irq) from [<c07747c0>] (__irq_svc+0x40/0x50)
[ 137.176441] Exception stack(0xc0b41f58 to 0xc0b41fa0)
[ 137.181754] 1f40: ffffffed 00000000
[ 137.190363] 1f60: 00000000 00000000 c0b40000 00000000 00000000 c0b40000 c0b480b8 413fc082
[ 137.198982] 1f80: c0bbe7d0 ffffffed 01000000 c0b41fa0 c000f814 c000f818 60070013 ffffffff
[ 137.207595] [<c07747c0>] (__irq_svc) from [<c000f818>] (arch_cpu_idle+0x28/0x30)
[ 137.215397] [<c000f818>] (arch_cpu_idle) from [<c0065dac>] (cpu_startup_entry+0xf8/0x320)
[ 137.224016] [<c0065dac>] (cpu_startup_entry) from [<c0ad8a54>] (start_kernel+0x340/0x3a8)
[ 137.232643] ---[ end trace 503bd9b73fde7606 ]---

Thanks,

Gordon

Is anything being done with regards to the ethernet interface such as ifconfig up/down commands when this problem happens?

Do you have a similar setup as the earlier post with several PHYs?

Could you post the boot sequence like the earlier post?

You have to run "ipdown eth0" and then "ipup eth0" to bring the ethenet connection back.

The BCM5325 is an 5-port swith which is connected to the MII1 interface of AM335x in MII mode.

As you can see in the boot sequence below, it recognizes 5 PHYs.

Thanks,

Gordon

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0

[    0.000000] Initializing cgroup subsys cpuset

[    0.000000] Initializing cgroup subsys cpu

[ 0.000000] Initializing cgroup subsys cpuacct

[    0.000000] Linux version 3.15.5+ (gordon@ecore) (gcc version 4.7.3 20130226 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2013.03-20130313 - Linaro GCC 2013.03) ) #32 Tue  Jul 22 09:51:18 PDT 2014

[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d

[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache

[    0.000000] Machine model: TI AM335x Tetra2 Engine

[    0.000000] Memory policy: Data cache writeback

[    0.000000] CPU: All CPU(s) started in SVC mode.

[    0.000000] AM335X ES2.1 (neon )

[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 64768

[    0.000000] Kernel command line: console=ttyO0,115200n8 /dev/fb0 root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait

[    0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)

[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)

[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)

[    0.000000] allocated 524288 bytes of page_cgroup

[    0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups

[    0.000000] Memory: 245164K/261120K available (7883K kernel code, 584K rwdata, 3184K rodata, 409K init, 906K bss, 15956K reserved, 0K highmem)

[    0.000000] Virtual kernel memory layout:

[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)

[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)

[    0.000000]     vmalloc : 0xd0800000 - 0xff000000   ( 744 MB)

[    0.000000]     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)

[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)

[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)

[    0.000000]       .text : 0xc0008000 - 0xc0ad718c   (11069 kB)

[    0.000000]       .init : 0xc0ad8000 - 0xc0b3e430   ( 410 kB)

[    0.000000]       .data : 0xc0b40000 - 0xc0bd21c8   ( 585 kB)

[    0.000000]        .bss : 0xc0bd21c8 - 0xc0cb49e4   ( 907 kB)

[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1

[    0.000000] NR_IRQS:16 nr_irqs:16 16

[    0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts

[    0.000000] Total of 128 interrupts on 1 active controller

[    0.000000] OMAP clockevent source: timer2 at 24000000 Hz

[    0.000015] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956969942ns

[    0.000039] OMAP clocksource: timer1 at 24000000 Hz

[    0.000271] Console: colour dummy device 80x30

[    0.000301] Calibrating delay loop... 597.60 BogoMIPS (lpj=2988032)

[    0.059247] pid_max: default: 32768 minimum: 301

[    0.059350] Security Framework initialized

[    0.059435] Yama: becoming mindful.

[    0.059675] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)

[    0.059689] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)

[    0.060417] Initializing cgroup subsys memory

[    0.060452] Initializing cgroup subsys devices

[    0.060464] Initializing cgroup subsys freezer

[    0.060476] Initializing cgroup subsys net_cls

[    0.060485] Initializing cgroup subsys blkio

[    0.060495] Initializing cgroup subsys perf_event

[    0.060557] CPU: Testing write buffer coherency: ok

[    0.060953] Setting up static identity map for 0x80779de0 - 0x80779e38

[    0.066071] devtmpfs: initialized

[    0.068062] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3

[    0.077383] omap_hwmod: tptc0 using broken dt data from edma

[    0.077491] omap_hwmod: tptc1 using broken dt data from edma

[    0.077586] omap_hwmod: tptc2 using broken dt data from edma

[    0.082116] omap_hwmod: debugss: _wait_target_disable failed

[    0.140470] xor: measuring software checksum speed

[    0.239282]    arm4regs  :   747.600 MB/sec

[    0.339280]    8regs     :   584.400 MB/sec

[    0.439281]    32regs    :   584.400 MB/sec

[    0.539275]    neon      :  1089.200 MB/sec

[    0.539286] xor: using function: neon (1089.200 MB/sec)

[    0.539306] pinctrl core: initialized pinctrl subsystem

[    0.539790] regulator-dummy: no parameters

[    0.550530] NET: Registered protocol family 16

[    0.551282] DMA: preallocated 256 KiB pool for atomic coherent allocations

[    0.552218] cpuidle: using governor ladder

[    0.552232] cpuidle: using governor menu

[    0.561551] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568

[    0.562544] platform 49000000.edma: alias fck already exists

[    0.562570] platform 49000000.edma: alias fck already exists

[    0.562586] platform 49000000.edma: alias fck already exists

[    0.563289] OMAP GPIO hardware version 0.1

[    0.567410] platform 481cc000.d_can: alias fck already exists

[    0.570986] omap-gpmc 50000000.gpmc: GPMC revision 6.0

[    0.572700] No ATAGs?

[    0.572720] hw-breakpoint: debug architecture 0x4 unsupported.

[    0.573987] omap_init_mbox: hwmod doesn't have valid attrs

[    0.749625] raid6: int32x1    126 MB/s

[    0.919335] raid6: int32x2    163 MB/s

[    1.089457] raid6: int32x4    169 MB/s

[    1.259432] raid6: int32x8    167 MB/s

[    1.429321] raid6: neonx1     863 MB/s

[    1.599319] raid6: neonx2    1101 MB/s

[    1.769300] raid6: neonx4    1171 MB/s

[    1.939357] raid6: neonx8     716 MB/s

[    1.939367] raid6: using algorithm neonx4 (1171 MB/s)

[    1.939375] raid6: using intx1 recovery algorithm

[    1.947359] edma-dma-engine edma-dma-engine.0: TI EDMA DMA engine driver

[    1.950419] SCSI subsystem initialized

[    1.950931] usbcore: registered new interface driver usbfs

[    1.951027] usbcore: registered new interface driver hub

[    1.951284] usbcore: registered new device driver usb

[    1.954280] DCDC1: at 1500 mV

[    1.955152] vdd_mpu: 925 <--> 1325 mV at 1100 mV

[    1.955990] vdd_core: 925 <--> 1150 mV at 1100 mV

[    1.956834] LDO1: at 1800 mV

[    1.957646] LDO2: at 3300 mV

[    1.959007] LDO3: 1800 mV

[    1.959922] LDO4: at 3300 mV

[    1.960452] tps65217 0-0024: TPS65217 ID 0xe version 1.2

[    1.961075] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz

[    1.962293] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 100 kHz

[    1.962482] media: Linux media interface: v0.10

[    1.962564] Linux video capture interface: v2.00

[    1.962698] pps_core: LinuxPPS API ver. 1 registered

[    1.962708] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>

[    1.962742] PTP clock support registered

[    1.963680] Advanced Linux Sound Architecture Driver Initialized.

[    1.964402] NetLabel: Initializing

[    1.964416] NetLabel:  domain hash size = 128

[    1.964423] NetLabel:  protocols = UNLABELED CIPSOv4

[    1.964496] NetLabel:  unlabeled traffic allowed by default

[    1.964730] Switched to clocksource timer1

[    2.011556] NET: Registered protocol family 2

[    2.012334] TCP established hash table entries: 2048 (order: 1, 8192 bytes)

[    2.012378] TCP bind hash table entries: 2048 (order: 1, 8192 bytes)

[    2.012413] TCP: Hash tables configured (established 2048 bind 2048)

[    2.012491] TCP: reno registered

[    2.012506] UDP hash table entries: 256 (order: 0, 4096 bytes)

[    2.012529] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)

[    2.012725] NET: Registered protocol family 1

[    2.013202] RPC: Registered named UNIX socket transport module.

[    2.013218] RPC: Registered udp transport module.

[    2.013225] RPC: Registered tcp transport module.

[    2.013233] RPC: Registered tcp NFSv4.1 backchannel transport module.

[    2.013895] hw perfevents: enabled with ARMv7 Cortex-A8 PMU driver, 5 counters available

[    2.016063] futex hash table entries: 256 (order: -1, 3072 bytes)

[    2.299841] VFS: Disk quotas dquot_6.5.2

[    2.300101] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)

[    2.302270] NFS: Registering the id_resolver key type

[    2.302348] Key type id_resolver registered

[    2.302358] Key type id_legacy registered

[    2.302381] nfs4filelayout_init: NFSv4 File Layout Driver Registering...

[    2.302709] fuse init (API version 7.23)

[    2.303269] SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled

[    2.305833] msgmni has been set to 478

[    2.307264] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249)

[    2.307423] io scheduler noop registered

[    2.307435] io scheduler deadline registered

[    2.307515] io scheduler cfq registered (default)

[    2.311338] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled

[    2.313574] omap_uart 44e09000.serial: no wakeirq for uart0

[    2.313986] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 3000000) is a OMAP UART0

[    3.133584] console [ttyO0] enabled

[    3.137870] omap_uart 48024000.serial: no wakeirq for uart0

[    3.144040] 48024000.serial: ttyO2 at MMIO 0x48024000 (irq = 90, base_baud = 3000000) is a OMAP UART2

[    3.154347] omap_uart 481a6000.serial: no wakeirq for uart0

[    3.160609] 481a6000.serial: ttyO3 at MMIO 0x481a6000 (irq = 60, base_baud = 3000000) is a OMAP UART3

[    3.170919] omap_uart 481a8000.serial: no wakeirq for uart0

[    3.177152] 481a8000.serial: ttyO4 at MMIO 0x481a8000 (irq = 61, base_baud = 3000000) is a OMAP UART4

[    3.188553] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20

[    3.195828] [drm] Initialized drm 1.1.0 20060810

[    3.202986] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xba

[    3.209734] nand: Micron MT29F2G16ABBEAH4

[    3.213954] nand: 256MiB, SLC, page size: 2048, OOB size: 64

[    3.219926] nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme

[    3.225618] 9 ofpart partitions found on MTD device omap2-nand.0

[    3.231935] Creating 9 MTD partitions on "omap2-nand.0":

[    3.237554] 0x000000000000-0x000000020000 : "SPL1"

[    3.244197] 0x000000020000-0x000000040000 : "SPL2"

[    3.250612] 0x000000040000-0x000000060000 : "SPL3"

[    3.256874] 0x000000060000-0x000000080000 : "SPL4"

[    3.263102] 0x000000080000-0x000000240000 : "U-boot"

[    3.270895] 0x000000240000-0x000000260000 : "device tree"

[    3.277837] 0x000000260000-0x000000280000 : "environment"

[    3.284713] 0x000000280000-0x000000780000 : "Kernel"

[    3.295276] 0x000000780000-0x000010000000 : "File-System"

[    3.508758] m25p80 spi1.0: mr25h256 (32 Kbytes)

[    3.515386] vcan: Virtual CAN interface driver

[    3.520870] usbcore: registered new interface driver usb-storage

[    3.580755] mousedev: PS/2 mouse device common for all mice

[    3.587719] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as rtc0

[    3.595489] rtc-pcf2127 1-0051: chip found, driver version 0.0.1

[    3.603262] rtc-pcf2127 1-0051: low voltage detected, date/time is not reliable.

[    3.611335] rtc-pcf2127 1-0051: rtc core: registered rtc-pcf2127 as rtc1

[    3.618477] i2c /dev entries driver

[    3.622657] IR Sharp protocol handler initialized

[    3.627986] tmp102 0-0049: error reading config register

[    3.633592] tmp102: probe of 0-0049 failed with error -121

[    3.640514] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec

[    3.648154] sdhci: Secure Digital Host Controller Interface driver

[    3.654640] sdhci: Copyright(c) Pierre Ossman

[    3.659953] 48060000.mmc supply vmmc not found, using dummy regulator

[    3.666883] omap_hsmmc 48060000.mmc: could not set regulator OCR (-22)

[    3.674292] omap_hsmmc 48060000.mmc: could not set regulator OCR (-22)

[    3.715021] sdhci-pltfm: SDHCI platform and OF driver helper

[    3.725553] ledtrig-cpu: registered to indicate activity on CPUs

[    3.731977] hidraw: raw HID events driver (C) Jiri Kosina

[    3.738935] usbcore: registered new interface driver usbhid

[    3.744871] usbhid: USB HID core driver

[    3.751008] oprofile: using arm/armv7

[    3.755252] TCP: cubic registered

[    3.758754] Initializing XFRM netlink socket

[    3.763250] omap_hsmmc 48060000.mmc: exceeding card's volts

[    3.769846] NET: Registered protocol family 10

[    3.776816] mip6: Mobile IPv6

[    3.779959] NET: Registered protocol family 17

[    3.784664] NET: Registered protocol family 15

[    3.789384] can: controller area network core (rev 20120528 abi 9)

[    3.798025] NET: Registered protocol family 29

[    3.802767] can: raw protocol (rev 20120528)

[    3.807299] can: broadcast manager protocol (rev 20120528 t)

[    3.813382] Key type dns_resolver registered

[    3.817903] mpls_gso: MPLS GSO support

[    3.823187] ThumbEE CPU extension supported.

[    3.827777] Registering SWP/SWPB emulation handler

[    3.832815] SmartReflex Class3 initialized

[    3.837901] registered taskstats version 1

[    3.845765] Btrfs loaded

[    3.848598] Error: Driver 'tfp410' is already registered, aborting...

[    3.856900] tilcdc 4830e000.lcdc: no encoders/connectors found

[    3.863048] tilcdc 4830e000.lcdc: failed to initialize mode setting

[    3.984762] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6

[    3.991185] davinci_mdio 4a101000.mdio: detected phy mask bfffffe0

[    4.030441] libphy: 4a101000.mdio: probed

[    4.034670] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver Broadcom B53 (1)

[    4.043955] davinci_mdio 4a101000.mdio: phy[1]: device 4a101000.mdio:01, driver Broadcom B53 (1)

[    4.053210] davinci_mdio 4a101000.mdio: phy[2]: device 4a101000.mdio:02, driver Broadcom B53 (1)

[    4.062473] davinci_mdio 4a101000.mdio: phy[3]: device 4a101000.mdio:03, driver Broadcom B53 (1)

[    4.071738] davinci_mdio 4a101000.mdio: phy[4]: device 4a101000.mdio:04, driver Broadcom B53 (1)

[    4.080996] davinci_mdio 4a101000.mdio: phy[30]: device 4a101000.mdio:1e, driver unknown

[    4.090117] platform 47401b00.usb-phy: Driver am335x-phy-driver requests probe deferral

[    4.099227] Detected MACID = 1c:ba:8c:f8:a8:5d

[    4.121818] omap_rtc 44e3e000.rtc: setting system clock to 2000-01-01 00:00:01 UTC (946684801)

[    4.130932] sr_init: No PMIC hook to init smartreflex

[    4.136449] sr_init: platform driver register failed for SR

[    4.142407] ### dt-test ### No testcase data in device tree; not running tests

[    4.170982] ALSA device list:

[    4.174123]   No soundcards found.

[    4.177988] platform musb-hdrc.0.auto: Driver musb-hdrc requests probe deferral

[    4.186523] Waiting for root device /dev/mmcblk0p2...

[    4.222482] mmc0: host does not support reading read-only switch. assuming write-enable.

[    4.233042] mmc0: new high speed SD card at address da4a

[    4.239321] mmcblk0: mmc0:da4a SV02G 1.87 GiB

[    4.245551]  mmcblk0: p1 p2

[    4.416376] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)

[    4.425032] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.

[    4.440288] devtmpfs: mounted

[    4.444203] Freeing unused kernel memory: 408K (c0ad8000 - c0b3e000)

INIT: version 2.88 booting

Error opening /dev/fb0: No such file or directory

Starting udev

[    5.049264] udevd[100]: starting version 182

[    7.888082] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.

ERROR: could not open directory /lib/modules/3.15.5+: No such file or directory

WARNING: -e needs -E or -F

ERROR: could not open directory /lib/modules/3.15.5+: No such file or directory

FATAL: could not search modules: No such file or directory

Starting Bootlog daemon: bootlogd: cannot allocate pseudo tty: No such file or directory

bootlogd.

[    8.225898] EXT4-fs (mmcblk0p2): re-mounted. Opts: data=ordered

[    8.295654] random: dd urandom read with 94 bits of entropy available

ALSA: Restoring mixer settings...

/usr/sbin/alsactl: load_state:1696: No soundcards found...

Configuring network interfaces... [    9.154701] net eth0: initializing cpsw version 1.12 (0)

[    9.247491] b53_common: found switch: BCM5325, rev 0

[    9.252767] net eth0: phy found : id is : 0x143bc30

[    9.345127] net eth0: phy found : id is : 0x143bc30

[    9.351521] net eth0: BQL enabled

[    9.361305] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready

udhcpc (v1.20.2) started

Sending discover...

[   11.244902] cpsw 4a100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off

[   11.253168] cpsw 4a100000.ethernet eth0: Link is Up - Unsupported (update phy.c)/Half - flow control off

[   11.263297] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

[   11.345314] cpsw 4a100000.ethernet eth0: Link is Down

[   12.345396] cpsw 4a100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx

Sending discover...

Sending select for 192.168.86.145...

[   14.121773] random: nonblocking pool is initialized

Lease of 192.168.86.145 obtained, lease time 86400

/etc/udhcpc.d/50default: Adding DNS 192.168.86.1

done.

Tue Dec  5 09:36:00 UTC 2017

INIT: Entering runlevel: 5

Starting system message bus: dbus.

UIM SYSFS Node Not Found

Starting Dropbear SSH server: dropbear.

Starting telnet daemon.

Starting syslogd/klogd: done

Starting thttpd.

Starting Lighttpd Web Server: lighttpd.

2017-12-05 09:36:01: (log.c.166) server started

/

Starting Matrix GUI application.

***************************************************************

***************************************************************

NOTICE: This file system contains the followin GPLv3 packages:

        binutils-symlinks

        binutils

        gdbserver

If you do not wish to distribute GPLv3 components please remove

the above packages prior to distribution.  This can be done using

the opkg remove command.  i.e.:

    opkg remove <package>

Where <package> is the name printed in the list above

NOTE: If the package is a dependency of another package you

      will be notified of the dependent packages.  You should

      use the --force-removal-of-dependent-packages option to

      also remove the dependent packages as well

***************************************************************

***************************************************************

Stopping Bootlog daemon: bootlogd.

_____                    _____           _         _

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Arago Project

http://arago-project.org am335x-evm ttyO0

Arago 2013.12 am335x-evm ttyO0

am335x-evm login:

Is there a chance you can move back to the 3.12 kernel from the 7.0 SDK? The 3.15 mainline kernel that you are using  at this time is not supported by TI. 

So I want to make sure I understand, the if down/ifup is used to recover the network. The problem you are seeing is occurring in a steady state or  normal condition and is not being triggered as part of bringing the network up or down.

Could you post the error message you are seeing?

FYI - error message - the wachdog is trigged somehow...

------------[ cut here ]------------
[ 1156.021280] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:264 dev_watchdog+0x240/0x260()
[ 1156.030195] NETDEV WATCHDOG: eth0 (cpsw): transmit queue 0 timed out
[ 1156.036898] Modules linked in:
[ 1156.040123] CPU: 0 PID: 0 Comm: swapper Tainted: G        W     3.15.5+ #32
[ 1156.047500] [<c0013db4>] (unwind_backtrace) from [<c0011c3c>] (show_stack+0x10/0x14)
[ 1156.055670] [<c0011c3c>] (show_stack) from [<c003b14c>] (warn_slowpath_common+0x68/0x88)
[ 1156.064210] [<c003b14c>] (warn_slowpath_common) from [<c003b200>] (warn_slowpath_fmt+0x30/0x40)
[ 1156.073404] [<c003b200>] (warn_slowpath_fmt) from [<c067fcb0>] (dev_watchdog+0x240/0x260)
[ 1156.082032] [<c067fcb0>] (dev_watchdog) from [<c00458c0>] (call_timer_fn+0x3c/0x108)
[ 1156.090188] [<c00458c0>] (call_timer_fn) from [<c0045c68>] (run_timer_softirq+0x1b4/0x290)
[ 1156.098910] [<c0045c68>] (run_timer_softirq) from [<c003eda4>] (__do_softirq+0x90/0x284)
[ 1156.107450] [<c003eda4>] (__do_softirq) from [<c003f1e4>] (irq_exit+0x9c/0xe8)
[ 1156.115062] [<c003f1e4>] (irq_exit) from [<c000f6c0>] (handle_IRQ+0x34/0x84)
[ 1156.122489] [<c000f6c0>] (handle_IRQ) from [<c00085b8>] (omap3_intc_handle_irq+0x84/0x9c)
[ 1156.131105] [<c00085b8>] (omap3_intc_handle_irq) from [<c0775000>] (__irq_svc+0x40/0x50)
[ 1156.139628] Exception stack(0xc0b41f58 to 0xc0b41fa0)
[ 1156.144946] 1f40:                                                       ffffffed 00000000
[ 1156.153565] 1f60: 00000000 00000000 c0b40000 00000000 00000000 c0b40000 c0b480b8 413fc082
[ 1156.162182] 1f80: c0bbe7d0 ffffffed 01000000 c0b41fa0 c000f814 c000f818 60000013 ffffffff
[ 1156.170796] [<c0775000>] (__irq_svc) from [<c000f818>] (arch_cpu_idle+0x28/0x30)
[ 1156.178610] [<c000f818>] (arch_cpu_idle) from [<c0065e0c>] (cpu_startup_entry+0xf8/0x320)
[ 1156.187225] [<c0065e0c>] (cpu_startup_entry) from [<c0ad8a54>] (start_kernel+0x340/0x3a8)
[ 1156.195820] ---[ end trace 0357380fe7e9b306 ]---

Is it possible for you to switch to the 3.12 kernel in the TI SDK? I noticed that you are using a mainline kernel 3.15, this is not yet supported by TI.

With the 3.12 there is a documented problem with taking the interface up/down using the ifconfig command. The problem that you are seeing is different. One being that are able to recover the link. Also the sequence that causes that problem does not seem to apply here. 

Is there just one ethernet interface on the AM3335x?

I will try the 3.12 kernel.

Yes, there is only one ethernet interface on the AM335x which is GMII1/MII1.

I've tried the 3.12 kernel in the TI SDK. It has the same issue of lost Ethernet connection.

The Tracer is not enabled in the 3.12 Kernel Configuration so there is no error message.