Xrx200/lantiq: if connected w/ USB hub reading from ftdi (Arduino nano) hangs system

triaholgi · October 24, 2018, 7:06am

Hello,

I own a Arcadyan VGV7510KW22 (o2 Box 6431) where I successful installed 18.01. When I attach a USB hub to it successfully recognizes the hub an I can read/write normal from/to the connected drives (if). Also if I connect a ftdi (ardunio nano) to the hub it is successful recognized (ttyUSB0).
The problem starts if I try to read from ttyUSB0.
What I tried so far:

just use cat /dev/ttyUSB0
used minicom (w/ correct setting of baud rate..)
used some perl scrips directly reading from ttyUSB0
for all: used stty -F dev/ttyUSB0 prior for changing some interface settings

In all the cases: Once I start reading from ttyUSB0 the system seems to hang. Means: I cannot reach the device any more (even by ssh or http-luci). It seems that either the usb contoller starts dominating also the lan/ethernet interfaces to block them - or, the SoC itself is going to be overflowed.
Sometimes I can get the router back fast pressing ctrl-c (for several minutes), in other cases to router just reboots.

I think it could be related w/ the dwc2 integration in that device (I've seen similar symptoms reported in raspberry pi forums where they forced ftdi devices to full/high speed w/ dwc drivers to get rid of the problem), but I'm not sure. Maybe there are some special stty setting I have to set (but I know working setting from other openwrt devices)

Any ideas what to do?

BR, Christian

triaholgi · October 24, 2018, 7:48pm

Here are some more information

Link to the raspberry pi forum raspberry pi, ftdi USB hang up
-> here, dwc driver caused similar issue (solution: dwc_otg.speed=1)
-> how to do/achiev that in openwrt?

My kernel log:

[    0.000000] Linux version 4.9.120 (fuzzyandroid24@Mordor-PC-UNB) (gcc version 7.3.0 (OpenWrt GCC 7.3.0 r7258-5eb055306f) ) #0 SMP Thu Aug 16 07:51:15 2018
[    0.000000] SoC: xRX200 rev 1.2
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 00019556 (MIPS 34Kc)
[    0.000000] MIPS: machine is o2 Box 6431
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 04000000 @ 00000000 (usable)
[    0.000000] User-defined physical RAM map:
[    0.000000]  memory: 03e00000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Detected 1 available secondary CPU(s)
[    0.000000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000003dfffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000003dfffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000003dfffff]
[    0.000000] On node 0 totalpages: 15872
[    0.000000] free_area_init_node: node 0, pgdat 80527820, node_mem_map 81008e20
[    0.000000]   Normal zone: 124 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 15872 pages, LIFO batch:3
[    0.000000] percpu: Embedded 12 pages/cpu @8108b000 s17360 r8192 d23600 u49152
[    0.000000] pcpu-alloc: s17360 r8192 d23600 u49152 alloc=12*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 15748
[    0.000000] Kernel command line: console=ttyLTQ0,115200 mem=62M vpe1_load_addr=0x83e00000 vpe1_mem=2M maxvpes=1 maxtcs=1 nosmp
[    0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[    0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Writing ErrCtl register=00009688
[    0.000000] Readback ErrCtl register=00009688
[    0.000000] Memory: 55980K/63488K available (3925K kernel code, 162K rwdata, 1184K rodata, 1240K init, 232K bss, 7508K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000] NR_IRQS:256
[    0.000000] Setting up vectored interrupts
[    0.000000] Setting up IPI vectored interrupts
[    0.000000] CPU Clock: 500MHz
[    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041786 ns
[    0.000012] sched_clock: 32 bits at 250MHz, resolution 4ns, wraps every 8589934590ns
[    0.007886] Calibrating delay loop... 332.54 BogoMIPS (lpj=665088)
[    0.042391] pid_max: default: 32768 minimum: 301
[    0.047265] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.053804] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.064721] Brought up 1 CPUs
[    0.072371] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[    0.082036] futex hash table entries: 512 (order: 2, 16384 bytes)
[    0.088269] pinctrl core: initialized pinctrl subsystem
[    0.094236] NET: Registered protocol family 16
[    0.104134] pinctrl-xway 1e100b10.pinmux: Init done
[    0.109774] dma-xway 1e104100.dma: Init done - hw rev: 7, ports: 7, channels: 28
[    0.220021] dcdc-xrx200 1f106a00.dcdc: Core Voltage : 1016 mV
[    0.231597] PCI host bridge /fpi@10000000/pci@E105400 ranges:
[    0.237277]  MEM 0x0000000018000000..0x0000000019ffffff
[    0.242527]   IO 0x000000001ae00000..0x000000001affffff
[    0.282099] usbcore: registered new interface driver usbfs
[    0.287712] usbcore: registered new interface driver hub
[    0.293048] usbcore: registered new device driver usb
[    0.298455] PCI host bridge to bus 0000:00
[    0.302471] pci_bus 0000:00: root bus resource [mem 0x18000000-0x19ffffff]
[    0.309379] pci_bus 0000:00: root bus resource [io  0x1ae00000-0x1affffff]
[    0.316319] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[    0.323175] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[    0.331236] pci 0000:00:0e.0: [1814:3592] type 00 class 0x028000
[    0.331279] pci 0000:00:0e.0: reg 0x10: [mem 0xffff0000-0xffffffff]
[    0.331388] pci 0000:00:0e.0: PME# supported from D0 D3hot D3cold
[    0.331727] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
[    0.331763] pci 0000:00:0e.0: BAR 0: assigned [mem 0x18000000-0x1800ffff]
[    0.344465] clocksource: Switched to clocksource MIPS
[    0.351005] NET: Registered protocol family 2
[    0.356393] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[    0.363313] TCP bind hash table entries: 1024 (order: 1, 8192 bytes)
[    0.369696] TCP: Hash tables configured (established 1024 bind 1024)
[    0.376215] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    0.382057] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    0.388670] NET: Registered protocol family 1
[    0.393036] PCI: CLS 0 bytes, default 32
[    0.396674] gptu: totally 6 16-bit timers/counters
[    0.401589] gptu: misc_register on minor 63
[    0.405746] gptu: succeeded to request irq 126
[    0.410229] gptu: succeeded to request irq 127
[    0.414740] gptu: succeeded to request irq 128
[    0.419257] gptu: succeeded to request irq 129
[    0.423773] gptu: succeeded to request irq 130
[    0.428284] gptu: succeeded to request irq 131
[    0.436007] lantiq,vmmc 1f103000.vmmc: requested GPIO 465
[    0.441340] lantiq,vmmc 1f103000.vmmc: requested GPIO 493
[    0.446796] lantiq,vmmc 1f103000.vmmc: requested GPIO 492
[    0.452242] lantiq,vmmc 1f103000.vmmc: reserved 1MB at 0x03b00000
[    0.458692] phy-xrx200 gphy-xrx200: requesting lantiq/xrx200_phy22f_a22.bin
[    0.466342] phy-xrx200 gphy-xrx200: booting GPHY0 firmware at 3AA0000
[    0.472714] phy-xrx200 gphy-xrx200: booting GPHY1 firmware at 3AA0000
[    0.580731] genirq: Flags mismatch irq 0. 00000000 (RTLX) vs. 00000400 (IPI_resched)
[    0.589897] Crashlog allocated RAM at address 0x3d00000
[    0.602008] workingset: timestamp_bits=30 max_order=14 bucket_order=0
[    0.617554] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.623298] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.650917] io scheduler noop registered
[    0.654825] io scheduler deadline registered (default)
[    0.660731] 1e100c00.serial: ttyLTQ0 at MMIO 0x1e100c00 (irq = 112, base_baud = 0) is a lantiq,asc
[    0.669681] console [ttyLTQ0] enabled
[    0.676984] bootconsole [early0] disabled
[    0.685996] lantiq nor flash device: 01000000 at 10000000
[    0.690160] ltq_nor: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID 0x0000c2 Chip ID 0x00227e
[    0.699579] Amd/Fujitsu Extended Query Table at 0x0040
[    0.704709]   Amd/Fujitsu Extended Query version 1.3.
[    0.709740] number of CFI chips: 1
[    0.713184] 4 fixed-partitions partitions found on MTD device ltq_nor
[    0.719578] Creating 4 MTD partitions on "ltq_nor":
[    0.724458] 0x000000fe0000-0x000001000000 : "board_config"
[    0.733990] 0x000000000000-0x000000060000 : "uboot"
[    0.740388] 0x000000060000-0x000000080000 : "uboot-env"
[    0.746889] 0x000000080000-0x000000fe0000 : "firmware"
[    0.764483] 2 uimage-fw partitions found on MTD device firmware
[    0.769091] 0x000000080000-0x00000021fcb1 : "kernel"
[    0.776273] 0x00000021fcb1-0x000000fe0000 : "rootfs"
[    0.782362] mtd: device 5 (rootfs) set to be root filesystem
[    0.786728] 1 squashfs-split partitions found on MTD device rootfs
[    0.792822] 0x0000006a0000-0x000000fe0000 : "rootfs_data"
[    0.803119] libphy: Fixed MDIO Bus: probed
[    0.908126] libphy: lantiq,xrx200-mdio: probed
[    0.995830] ICPlus IP101A/G 0:01: attached PHY driver [ICPlus IP101A/G] (mii_bus:phy_addr=0:01, irq=-1)
[    1.076252] Intel XWAY PHY22F (xRX v1.2 integrated) 0:11: attached PHY driver [Intel XWAY PHY22F (xRX v1.2 integrated)] (mii_bus:phy_addr=0:11, irq=-1)
[    1.160251] Intel XWAY PHY22F (xRX v1.2 integrated) 0:12: attached PHY driver [Intel XWAY PHY22F (xRX v1.2 integrated)] (mii_bus:phy_addr=0:12, irq=-1)
[    1.187627] random: fast init done
[    1.244250] Intel XWAY PHY22F (xRX v1.2 integrated) 0:13: attached PHY driver [Intel XWAY PHY22F (xRX v1.2 integrated)] (mii_bus:phy_addr=0:13, irq=-1)
[    1.328251] Intel XWAY PHY22F (xRX v1.2 integrated) 0:14: attached PHY driver [Intel XWAY PHY22F (xRX v1.2 integrated)] (mii_bus:phy_addr=0:14, irq=-1)
[    1.442547] ltq-cputemp cputemp@0: Current CPU die temperature: 44.5 °C
[    1.448135] wdt 1f8803f0.watchdog: Init done
[    1.454694] NET: Registered protocol family 17
[    1.457849] 8021q: 802.1Q VLAN Support v1.8
[    1.479350] VFS: Mounted root (squashfs filesystem) readonly on device 31:5.
[    1.489343] Freeing unused kernel memory: 1240K
[    1.492476] This architecture does not have kernel memory protection.
[    2.316766] init: Console is alive
[    2.319055] init: - watchdog -
[    3.312316] lantiq,xrx200-net 1e108000.eth eth0: port 3 got link
[    4.292669] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    4.471504] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    4.486351] SCSI subsystem initialized
[    4.494535] ehci-platform: EHCI generic platform driver
[    4.502423] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    4.509033] ohci-platform: OHCI generic platform driver
[    4.515988] uhci_hcd: USB Universal Host Controller Interface driver
[    4.526733] dwc2 1e101000.ifxhcd: requested GPIO 509
[    4.631271] dwc2 1e101000.ifxhcd: DWC OTG Controller
[    4.634947] dwc2 1e101000.ifxhcd: new USB bus registered, assigned bus number 1
[    4.642213] dwc2 1e101000.ifxhcd: irq 62, io mem 0x00000000
[    4.647734] dwc2 1e101000.ifxhcd: Hardware does not support descriptor DMA mode -
[    4.655144] dwc2 1e101000.ifxhcd: falling back to buffer DMA mode.
[    4.663210] hub 1-0:1.0: USB hub found
[    4.666124] hub 1-0:1.0: 1 port detected
[    4.675196] usbcore: registered new interface driver usb-storage
[    4.680772] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    4.697633] init: - preinit -
[    5.450139] usb 1-1: new high-speed USB device number 2 using dwc2
[    5.745130] hub 1-1:1.0: USB hub found
[    5.747544] hub 1-1:1.0: 4 ports detected
[    5.753133] random: procd: uninitialized urandom read (4 bytes read)
[    6.055700] usb 1-1.2: new high-speed USB device number 3 using dwc2
[    6.169723] usb-storage 1-1.2:1.0: USB Mass Storage device detected
[    6.176467] scsi host0: usb-storage 1-1.2:1.0
[    6.279706] usb 1-1.4: new full-speed USB device number 4 using dwc2
[    6.657969] random: crng init done
[    7.206599] scsi 0:0:0:0: Direct-Access     Generic  Flash Disk       8.07 PQ: 0 ANSI: 4
[    7.219126] sd 0:0:0:0: [sda] 3934208 512-byte logical blocks: (2.01 GB/1.88 GiB)
[    7.226488] sd 0:0:0:0: [sda] Write Protect is off
[    7.230092] sd 0:0:0:0: [sda] Mode Sense: 23 00 00 00
[    7.231372] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[    7.247482]  sda: sda1
[    7.254610] sd 0:0:0:0: [sda] Attached SCSI removable disk
[    9.051518] mount_root: loading kmods from internal overlay
[    9.111787] kmodloader: loading kernel modules from //etc/modules-boot.d/*
[    9.121556] kmodloader: done loading kernel modules from //etc/modules-boot.d/*
[   10.185168] jffs2: notice: (483) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[   10.200116] block: attempting to load /tmp/jffs_cfg/upper/etc/config/fstab
[   10.210676] block: extroot: not configured
[   10.289855] jffs2: notice: (481) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[   10.961756] block: attempting to load /tmp/jffs_cfg/upper/etc/config/fstab
[   10.970880] block: extroot: not configured
[   10.975911] mount_root: switching to jffs2 overlay
[   11.035076] urandom-seed: Seeding with /etc/urandom.seed
[   11.200364] procd: - early -
[   11.202006] procd: - watchdog -
[   11.907844] lantiq,xrx200-net 1e108000.eth eth0: port 3 lost link
[   11.996519] procd: - watchdog -
[   11.998925] procd: - ubus -
[   12.171263] procd: - init -
[   13.083501] kmodloader: loading kernel modules from /etc/modules.d/*
[   13.132005] IFXOS, Version 1.5.19 (c) Copyright 2009, Lantiq Deutschland GmbH
[   13.162081] Lantiq TAPI device driver, version 3.13.0.2, (c) 2001-2010 Lantiq Deutschland GmbH
[   13.184211] NET: Registered protocol family 8
[   13.187127] NET: Registered protocol family 20
[   13.242808] PPP generic driver version 2.4.2
[   13.274268] Lantiq (VRX) DSL CPE MEI driver, version 1.5.17.6, (c) 2007-2015 Lantiq Beteiligungs-GmbH & Co. KG
[   13.300546] 
[   13.300546] 
[   13.300546] Lantiq CPE API Driver version: DSL CPE API V4.17.18.6
[   13.308334] 
[   13.308334] Predefined debug level: 3
[   13.327266] Loading modules backported from Linux version wt-2017-11-01-0-gfe248fc2c180
[   13.334018] Backport generated by backports.git v4.14-rc2-1-31-g86cf0e5d
[   13.358797] Lantiq MIPS34KEc MPS driver, version 2.2.2.5, (c) 2006-2010 Lantiq Deutschland GmbH
[   13.366198] request_timer(2, 0x000001AE, 1)...
[   13.370423] successful!
[   13.373380] Lantiq VMMC device driver, version 1.9.0.3, (c) 2006-2010 Lantiq Deutschland GmbH
[   13.389333] Infineon Technologies DEU driver version 2.0.0 
[   13.399015] IFX DEU DES initialized (multiblock).
[   13.405521] IFX DEU AES initialized (multiblock).
[   13.409840] IFX DEU ARC4 initialized (multiblock).
[   13.416301] IFX DEU SHA1 initialized.
[   13.419168] IFX DEU MD5 initialized.
[   13.423476] IFX DEU SHA1_HMAC initialized.
[   13.426988] IFX DEU MD5_HMAC initialized.
[   13.441097] nf_conntrack version 0.5.0 (1024 buckets, 4096 max)
[   13.709979] NET: Registered protocol family 24
[   13.716127] usbcore: registered new interface driver ums-alauda
[   13.724002] usbcore: registered new interface driver ums-cypress
[   13.731916] usbcore: registered new interface driver ums-datafab
[   13.739466] usbcore: registered new interface driver ums-freecom
[   13.747424] usbcore: registered new interface driver ums-isd200
[   13.755331] usbcore: registered new interface driver ums-jumpshot
[   13.763206] usbcore: registered new interface driver ums-karma
[   13.771463] usbcore: registered new interface driver ums-sddr09
[   13.779343] usbcore: registered new interface driver ums-sddr55
[   13.792371] usbcore: registered new interface driver ums-usbat
[   13.989166] usbcore: registered new interface driver usbserial
[   13.993864] usbcore: registered new interface driver usbserial_generic
[   14.000414] usbserial: USB Serial support registered for generic
[   14.038976] xt_time: kernel timezone is -0000
[   14.088953] usbcore: registered new interface driver ftdi_sio
[   14.093558] usbserial: USB Serial support registered for FTDI USB Serial Device
[   14.101119] ftdi_sio 1-1.4:1.0: FTDI USB Serial Device converter detected
[   14.107820] usb 1-1.4: Detected FT232RL
[   14.114214] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB0
[   14.124309] ip_tables: (C) 2000-2006 Netfilter Core Team
[   14.366131] PCI: Enabling device 0000:00:0e.0 (0000 -> 0002)
[   14.371001] rt2800pci 0000:00:0e.0: loaded eeprom from mtd device "board_config"
[   14.377855] ieee80211 phy0: rt2x00_set_rt: Info - RT chipset 3572, rev 0223 detected
[   14.385643] ieee80211 phy0: rt2x00_set_rf: Info - RF chipset 0008 detected
[   14.393313] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[   14.402858] kmodloader: done loading kernel modules from /etc/modules.d/*
[   14.735303] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: 
[   15.371496] Adding 262140k swap on /opt/swapfile.  Priority:-1 extents:3 across:309244k 
[   27.855599] br-lan: port 1(eth0.1) entered blocking state
[   27.859791] br-lan: port 1(eth0.1) entered disabled state
[   27.865738] device eth0.1 entered promiscuous mode
[   27.869988] device eth0 entered promiscuous mode
[   29.892098] lantiq,xrx200-net 1e108000.eth eth0: port 3 got link
[   29.897351] br-lan: port 1(eth0.1) entered blocking state
[   29.902169] br-lan: port 1(eth0.1) entered forwarding state
[   32.438515] ieee80211 phy0: rt2x00lib_request_firmware: Info - Loading firmware file 'rt2860.bin'
[   32.501942] ieee80211 phy0: rt2x00lib_request_firmware: Info - Firmware detected - version: 0.40
[   32.853383] br-lan: port 2(wlan0) entered blocking state
[   32.857437] br-lan: port 2(wlan0) entered disabled state
[   32.863269] device wlan0 entered promiscuous mode
[   34.787566] br-lan: port 2(wlan0) entered blocking state
[   34.791531] br-lan: port 2(wlan0) entered forwarding state

Here are my stty settings for ttyUSB0 which I succefull use with other non-xrx200 devices and ardunio nano attached to usb:

stty -F /dev/ttyUSB0 -parenb -parodd cs8 -hupcl -cstopb cread clocal -crtscts -iuclc -ixany -imaxbel -iutf8 -opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 -isig -icanon -iexten -echo -echoe -echok -echonl -noflsh -xcase -tostop -echoprt -echoctl -echoke

Mijzelf · October 25, 2018, 3:07pm

AFAIK you have to find the file which lists dwc-otg in /etc/modules-boot.d/ or /etc/modules.d/ and add the param speed=1

triaholgi · October 25, 2018, 7:02pm

Thank you @Mijzelf for your help.

I found under

root@bridge-ke:/etc/modules.d# ls
02-crypto-hash          09-crypto-null          30-fs-cifs              50-usb-uhci             ltq-deu-vr9             rt2x00-pci
04-crypto-crc32c        09-crypto-sha256        30-fs-ext4              51-ltq-vdsl-vr9         ltq-vmmc                usb-serial
09-crypto-aead          10-ltq-ifxos            30-gpio-button-hotplug  54-usb-dwc2             nf-conntrack            usb-serial-ftdi
09-crypto-des           20-eeprom-93cx6         35-usb-ehci             60-leds-gpio            nf-ipt                  usb-storage
09-crypto-ecb           20-lib-crc16            40-pppoa                ipt-conntrack           nf-nat                  usb-storage-extras
09-crypto-hmac          20-ltq-tapi             40-scsi-core            ipt-core                nf-reject               usbmon
09-crypto-manager       20-usb-core             40-usb2                 ipt-nat                 ppp
09-crypto-md4           25-nls-utf8             50-ltq-vdsl-vr9-mei     lib-crc-ccitt           pppoe
09-crypto-md5           30-atm                  50-usb-ohci             lib-crc-itu-t           rt2800-pci

The 54-usb-dwc2 file where I added speed=1 to

dwc2
speed=1

But unfortunatelly the problem still exits (also tried w/ speed=1 in the first line). Also I haven't found a content w/ dwc-otg.

For both (w and w/ speed=1 entry) my kernel log for usb (I have a hub w/ one stick and one arduino attached) is as follows

root@bridge-ke:~# logread | grep dwc2
Thu Oct 25 20:47:54 2018 kern.info kernel: [    4.527303] dwc2 1e101000.ifxhcd: requested GPIO 509
Thu Oct 25 20:47:54 2018 kern.info kernel: [    4.633546] dwc2 1e101000.ifxhcd: DWC OTG Controller
Thu Oct 25 20:47:54 2018 kern.info kernel: [    4.637224] dwc2 1e101000.ifxhcd: new USB bus registered, assigned bus number 1
Thu Oct 25 20:47:54 2018 kern.info kernel: [    4.644492] dwc2 1e101000.ifxhcd: irq 62, io mem 0x00000000
Thu Oct 25 20:47:54 2018 kern.err kernel: [    4.650013] dwc2 1e101000.ifxhcd: Hardware does not support descriptor DMA mode -
Thu Oct 25 20:47:54 2018 kern.err kernel: [    4.657424] dwc2 1e101000.ifxhcd: falling back to buffer DMA mode.
Thu Oct 25 20:47:54 2018 kern.info kernel: [    5.453517] usb 1-1: new high-speed USB device number 2 using dwc2
Thu Oct 25 20:47:54 2018 kern.info kernel: [    6.055699] usb 1-1.2: new high-speed USB device number 3 using dwc2
Thu Oct 25 20:47:54 2018 kern.info kernel: [    6.279705] usb 1-1.4: new full-speed USB device number 4 using dwc2

At least the ftdi is recognised as full speed

root@bridge-ke:~# logread | grep ftdi
Thu Oct 25 20:48:59 2018 kern.info kernel: [   14.084482] usbcore: registered new interface driver ftdi_sio
Thu Oct 25 20:48:59 2018 kern.info kernel: [   14.096667] ftdi_sio 1-1.4:1.0: FTDI USB Serial Device converter detected

Any further hints?

triaholgi · October 26, 2018, 7:19am

Is there a way to set that (dwc2) speed value under development environment and than compile my firmware w/ that setting?

How exactly does that work?

triaholgi · October 27, 2018, 8:57pm

One update: I found that directly connected to o2 box the arduino nano and the system responds normal.
I only have that hang problem if I use a USB hub together w/ an arduino nano. I also tried different USB hubs: no effect.
Thus it seems that there could be a basic problem w/ USB hub + ftdi integration at least for lantiq/xrx200 systems

changed to topic name....
report as bug

triaholgi · October 28, 2018, 9:12am

another short update.
just testet USB hub and ftdi conntected to hub (hub to rooter) on other openwrt system (rt-n56u, ralink 3883): works perfect

So it seems, that I can reproduce that hangup only on xrx200 system when a USB hub is used.