Hi everyone, I am trying to get Renesas uPD720202 USB3.0 hub working which is connected PCIe switch (PEX8605); PEX8605 is connected to i.MX6Q through its x1 PCIe Gen2 interface. Running Linux-4.19.25 vanilla kernel with patches from Phytec.de for their Phycore-iMX6Q SOM. We have 2x PEX8605 ports connected to mPCIe slots and 2x WLAN modules (QCA9880) working perfectly. Facing kernel "Unhandled fault: imprecise external abort (0x1406)" when trying to load xhci_pci.ko module for uPD720202. Receiving this fault straight-away when driver trying to setup device. uPD720202 don't have external EEPROM support, so I have to load firmware in chips memory before loading the driver. Sometimes after loading the driver, I see the USB3.0 hub but then doing "lsusb -v" crashes the driver with same above mentioned fault. Tried to disable DMA from kernel configuration but still same result. From hardware side verified the RESET pins for PEX8605 and uPD720202 chips but no change. Also wanted to read PCIe switch registers using I2C interface but have to figure-out how to do that (saw some patches email from Rajat Jain from 2014 but seems like can't find the patch attachment anywhere on Google). The kernel log is below. Any help or pointers in solving this problem will be much appreciated. [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.19.25-bsp-yocto-i.mx6-pd18.1.1 (br-user@flateef-XPS-13-9360) (gcc version 8.2.0 (Buildroot 2018.11.4-gebef590b)) #3 SMP Wed Jul 31 11:13:06 UTC 2019 [ 0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c5387d [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt: Machine model: PHYTEC phyBOARD-Mira Quad full featured with eMMC [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] cma: Reserved 128 MiB at 0x86000000 [ 0.000000] On node 0 totalpages: 524288 [ 0.000000] Normal zone: 1536 pages used for memmap [ 0.000000] Normal zone: 0 pages reserved [ 0.000000] Normal zone: 196608 pages, LIFO batch:63 [ 0.000000] HighMem zone: 327680 pages, LIFO batch:63 [ 0.000000] random: get_random_bytes called from start_kernel+0x88/0x3f8 with crng_init=0 [ 0.000000] percpu: Embedded 16 pages/cpu @(ptrval) s34828 r8192 d22516 u65536 [ 0.000000] pcpu-alloc: s34828 r8192 d22516 u65536 alloc=16*4096 [ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 522752 [ 0.000000] Kernel command line: console=ttymxc1,115200n8 root=/dev/mmcblk3p2 rootwait rw [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) [ 0.000000] Memory: 1934476K/2097152K available (8192K kernel code, 357K rwdata, 2464K rodata, 1024K init, 398K bss, 31604K reserved, 131072K cma-reserved, 1178732K highmem) [ 0.000000] Virtual kernel memory layout: [ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB) [ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB) [ 0.000000] vmalloc : 0xf0800000 - 0xff800000 ( 240 MB) [ 0.000000] lowmem : 0xc0000000 - 0xf0000000 ( 768 MB) [ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB) [ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB) [ 0.000000] .text : 0x(ptrval) - 0x(ptrval) (9184 kB) [ 0.000000] .init : 0x(ptrval) - 0x(ptrval) (1024 kB) [ 0.000000] .data : 0x(ptrval) - 0x(ptrval) ( 358 kB) [ 0.000000] .bss : 0x(ptrval) - 0x(ptrval) ( 399 kB) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1 [ 0.000000] rcu: Hierarchical RCU implementation. [ 0.000000] rcu: RCU event tracing is enabled. [ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16 [ 0.000000] L2C-310 errata 752271 769419 enabled [ 0.000000] L2C-310 enabling early BRESP for Cortex-A9 [ 0.000000] L2C-310 full line of zeros enabled for Cortex-A9 [ 0.000000] L2C-310 ID prefetch enabled, offset 16 lines [ 0.000000] L2C-310 dynamic clock gating enabled, standby mode enabled [ 0.000000] L2C-310 cache controller enabled, 16 ways, 1024 kB [ 0.000000] L2C-310: CACHE_ID 0x410000c7, AUX_CTRL 0x76470001 [ 0.000000] Switching to timer-based delay loop, resolution 333ns [ 0.000015] sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 715827882841ns [ 0.000049] clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 637086815595 ns [ 0.002812] Console: colour dummy device 80x30 [ 0.002873] Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 BogoMIPS (lpj=30000) [ 0.002903] pid_max: default: 32768 minimum: 301 [ 0.003188] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes) [ 0.003229] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes) [ 0.004259] CPU: Testing write buffer coherency: ok [ 0.004319] CPU0: Spectre v2: using BPIALL workaround [ 0.004991] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 [ 0.006092] Setting up static identity map for 0x10100000 - 0x10100078 [ 0.006363] rcu: Hierarchical SRCU implementation. [ 0.007568] smp: Bringing up secondary CPUs ... [ 0.008817] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001 [ 0.008827] CPU1: Spectre v2: using BPIALL workaround [ 0.010352] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002 [ 0.010364] CPU2: Spectre v2: using BPIALL workaround [ 0.011759] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003 [ 0.011770] CPU3: Spectre v2: using BPIALL workaround [ 0.011973] smp: Brought up 1 node, 4 CPUs [ 0.011997] SMP: Total of 4 processors activated (24.00 BogoMIPS). [ 0.012014] CPU: All CPU(s) started in SVC mode. [ 0.013747] devtmpfs: initialized [ 0.031282] VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4 [ 0.031759] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.031800] futex hash table entries: 1024 (order: 4, 65536 bytes) [ 0.044378] pinctrl core: initialized pinctrl subsystem [ 0.046052] NET: Registered protocol family 16 [ 0.058858] DMA: preallocated 256 KiB pool for atomic coherent allocations [ 0.059733] audit: initializing netlink subsys (disabled) [ 0.060061] audit: type=2000 audit(0.060:1): state=initialized audit_enabled=0 res=1 [ 0.061065] CPU identified as i.MX6Q, silicon rev 1.5 [ 0.071628] vdd1p1: supplied by regulator-dummy [ 0.072504] vdd3p0: supplied by regulator-dummy [ 0.073315] vdd2p5: supplied by regulator-dummy [ 0.093445] No ATAGs? [ 0.093674] hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers. [ 0.093704] hw-breakpoint: maximum watchpoint size is 4 bytes. [ 0.096202] imx6q-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver [ 0.134079] mxs-dma 110000.dma-apbh: initialized [ 0.141747] SCSI subsystem initialized [ 0.142183] libata version 3.00 loaded. [ 0.142561] usbcore: registered new interface driver usbfs [ 0.142661] usbcore: registered new interface driver hub [ 0.142816] usbcore: registered new device driver usb [ 0.145330] i2c i2c-0: IMX I2C adapter registered [ 0.145364] i2c i2c-0: can't use DMA, using PIO instead. [ 0.146253] i2c i2c-1: IMX I2C adapter registered [ 0.146285] i2c i2c-1: can't use DMA, using PIO instead. [ 0.147511] i2c i2c-2: IMX I2C adapter registered [ 0.147543] i2c i2c-2: can't use DMA, using PIO instead. [ 0.147877] pps_core: LinuxPPS API ver. 1 registered [ 0.147898] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it> [ 0.147942] PTP clock support registered [ 0.149207] Bluetooth: Core ver 2.22 [ 0.149351] NET: Registered protocol family 31 [ 0.149371] Bluetooth: HCI device and connection manager initialized [ 0.149400] Bluetooth: HCI socket layer initialized [ 0.149421] Bluetooth: L2CAP socket layer initialized [ 0.149488] Bluetooth: SCO socket layer initialized [ 0.150351] clocksource: Switched to clocksource mxc_timer1 [ 0.150704] VFS: Disk quotas dquot_6.6.0 [ 0.150854] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) [ 0.167130] NET: Registered protocol family 2 [ 0.168273] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes) [ 0.168336] TCP established hash table entries: 8192 (order: 3, 32768 bytes) [ 0.168506] TCP bind hash table entries: 8192 (order: 4, 65536 bytes) [ 0.168780] TCP: Hash tables configured (established 8192 bind 8192) [ 0.169113] UDP hash table entries: 512 (order: 2, 16384 bytes) [ 0.169195] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes) [ 0.169686] NET: Registered protocol family 1 [ 0.170642] RPC: Registered named UNIX socket transport module. [ 0.170663] RPC: Registered udp transport module. [ 0.170677] RPC: Registered tcp transport module. [ 0.170692] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 0.170715] PCI: CLS 0 bytes, default 64 [ 0.171954] hw perfevents: no interrupt-affinity property for /pmu, guessing. [ 0.172349] hw perfevents: enabled with armv7_cortex_a9 PMU driver, 7 counters available [ 0.175261] Initialise system trusted keyrings [ 0.175573] workingset: timestamp_bits=30 max_order=19 bucket_order=0 [ 0.184016] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 0.185099] NFS: Registering the id_resolver key type [ 0.185145] Key type id_resolver registered [ 0.185163] Key type id_legacy registered [ 0.185238] jffs2: version 2.2. (NAND) �© 2001-2006 Red Hat, Inc. [ 0.186012] fuse init (API version 7.27) [ 0.195230] Key type asymmetric registered [ 0.195255] Asymmetric key parser 'x509' registered [ 0.195358] bounce: pool size: 64 pages [ 0.195390] io scheduler noop registered [ 0.195407] io scheduler deadline registered [ 0.195663] io scheduler cfq registered (default) [ 0.195687] io scheduler mq-deadline registered [ 0.195704] io scheduler kyber registered [ 0.199805] imx6q-pcie 1ffc000.pcie: Linked as a consumer to regulator.12 [ 0.199899] imx6q-pcie 1ffc000.pcie: host bridge /soc/pcie@1ffc000 ranges: [ 0.199964] imx6q-pcie 1ffc000.pcie: IO 0x01f80000..0x01f8ffff -> 0x00000000 [ 0.200006] imx6q-pcie 1ffc000.pcie: MEM 0x01000000..0x01efffff -> 0x01000000 [ 0.420529] imx6q-pcie 1ffc000.pcie: Link up [ 0.420554] imx6q-pcie 1ffc000.pcie: Link: Gen2 disabled [ 0.420575] imx6q-pcie 1ffc000.pcie: Link up, Gen1 [ 0.420902] imx6q-pcie 1ffc000.pcie: PCI host bridge to bus 0000:00 [ 0.420934] pci_bus 0000:00: root bus resource [bus 00-ff] [ 0.420959] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] [ 0.420982] pci_bus 0000:00: root bus resource [mem 0x01000000-0x01efffff] [ 0.421051] pci 0000:00:00.0: [16c3:abcd] type 01 class 0x060400 [ 0.421106] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x000fffff] [ 0.421133] pci 0000:00:00.0: reg 0x38: [mem 0x00000000-0x0000ffff pref] [ 0.421237] pci 0000:00:00.0: supports D1 [ 0.421252] pci 0000:00:00.0: PME# supported from D0 D1 D3hot D3cold [ 0.431113] PCI: bus0: Fast back to back transfers disabled [ 0.431458] pci 0000:01:00.0: [10b5:8605] type 01 class 0x060400 [ 0.431685] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00003fff] [ 0.432403] pci 0000:01:00.0: supports D1 D2 [ 0.432418] pci 0000:01:00.0: PME# supported from D0 D1 D2 D3hot D3cold [ 0.432622] pci 0000:01:00.0: 2.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s x1 link at 0000:00:00.0 (capable of 4.000 Gb/s with 5 GT/s x1 link) [ 0.469726] PCI: bus1: Fast back to back transfers disabled [ 0.469770] pci 0000:01:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring [ 0.470736] pci 0000:02:01.0: [10b5:8605] type 01 class 0x060400 [ 0.471649] pci 0000:02:01.0: supports D1 D2 [ 0.471663] pci 0000:02:01.0: PME# supported from D0 D1 D2 D3hot D3cold [ 0.472678] pci 0000:02:02.0: [10b5:8605] type 01 class 0x060400 [ 0.473584] pci 0000:02:02.0: supports D1 D2 [ 0.473598] pci 0000:02:02.0: PME# supported from D0 D1 D2 D3hot D3cold [ 0.474617] pci 0000:02:03.0: [10b5:8605] type 01 class 0x060400 [ 0.475520] pci 0000:02:03.0: supports D1 D2 [ 0.475534] pci 0000:02:03.0: PME# supported from D0 D1 D2 D3hot D3cold [ 0.485021] PCI: bus2: Fast back to back transfers disabled [ 0.485062] pci 0000:02:01.0: bridge configuration invalid ([bus 00-00]), reconfiguring [ 0.485132] pci 0000:02:02.0: bridge configuration invalid ([bus 00-00]), reconfiguring [ 0.485199] pci 0000:02:03.0: bridge configuration invalid ([bus 00-00]), reconfiguring [ 0.485764] pci 0000:03:00.0: [1912:0015] type 00 class 0x0c0330 [ 0.485993] pci 0000:03:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] [ 0.486752] pci 0000:03:00.0: PME# supported from D0 D3hot [ 0.487022] pci 0000:03:00.0: 2.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s x1 link at 0000:00:00.0 (capable of 4.000 Gb/s with 5 GT/s x1 link) [ 0.549694] PCI: bus3: Fast back to back transfers disabled [ 0.549732] pci_bus 0000:03: busn_res: [bus 03-ff] end is updated to 03 [ 0.550287] pci 0000:04:00.0: [168c:003c] type 00 class 0x028000 [ 0.550576] pci 0000:04:00.0: reg 0x10: [mem 0x00000000-0x001fffff 64bit] [ 0.550832] pci 0000:04:00.0: reg 0x30: [mem 0x00000000-0x0000ffff pref] [ 0.551344] pci 0000:04:00.0: supports D1 D2 [ 0.551360] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold [ 0.561547] PCI: bus4: Fast back to back transfers disabled [ 0.561583] pci_bus 0000:04: busn_res: [bus 04-ff] end is updated to 04 [ 0.571176] PCI: bus5: Fast back to back transfers enabled [ 0.571210] pci_bus 0000:05: busn_res: [bus 05-ff] end is updated to 05 [ 0.571256] pci_bus 0000:02: busn_res: [bus 02-ff] end is updated to 05 [ 0.571586] pci 0000:00:00.0: BAR 0: assigned [mem 0x01000000-0x010fffff] [ 0.571620] pci 0000:00:00.0: BAR 8: assigned [mem 0x01100000-0x016fffff] [ 0.571647] pci 0000:00:00.0: BAR 9: assigned [mem 0x01700000-0x018fffff pref] [ 0.571672] pci 0000:00:00.0: BAR 6: assigned [mem 0x01900000-0x0190ffff pref] [ 0.571695] pci 0000:00:00.0: BAR 7: assigned [io 0x1000-0x1fff] [ 0.571727] pci 0000:01:00.0: BAR 8: assigned [mem 0x01100000-0x015fffff] [ 0.571751] pci 0000:01:00.0: BAR 9: assigned [mem 0x01700000-0x018fffff 64bit pref] [ 0.571773] pci 0000:01:00.0: BAR 0: assigned [mem 0x01600000-0x01603fff] [ 0.571816] pci 0000:01:00.0: BAR 7: assigned [io 0x1000-0x1fff] [ 0.571849] pci 0000:02:01.0: BAR 8: assigned [mem 0x01100000-0x012fffff] [ 0.571872] pci 0000:02:01.0: BAR 9: assigned [mem 0x01700000-0x018fffff 64bit pref] [ 0.571896] pci 0000:02:02.0: BAR 8: assigned [mem 0x01300000-0x015fffff] [ 0.571917] pci 0000:02:01.0: BAR 7: assigned [io 0x1000-0x1fff] [ 0.571945] pci 0000:03:00.0: BAR 0: assigned [mem 0x01100000-0x01101fff 64bit] [ 0.572040] pci 0000:02:01.0: PCI bridge to [bus 03] [ 0.572071] pci 0000:02:01.0: bridge window [io 0x1000-0x1fff] [ 0.572119] pci 0000:02:01.0: bridge window [mem 0x01100000-0x012fffff] [ 0.572157] pci 0000:02:01.0: bridge window [mem 0x01700000-0x018fffff 64bit pref] [ 0.572221] pci 0000:04:00.0: BAR 0: assigned [mem 0x01400000-0x015fffff 64bit] [ 0.572313] pci 0000:04:00.0: BAR 6: assigned [mem 0x01300000-0x0130ffff pref] [ 0.572334] pci 0000:02:02.0: PCI bridge to [bus 04] [ 0.572380] pci 0000:02:02.0: bridge window [mem 0x01300000-0x015fffff] [ 0.572454] pci 0000:02:03.0: PCI bridge to [bus 05] [ 0.572552] pci 0000:01:00.0: PCI bridge to [bus 02-05] [ 0.572580] pci 0000:01:00.0: bridge window [io 0x1000-0x1fff] [ 0.572626] pci 0000:01:00.0: bridge window [mem 0x01100000-0x015fffff] [ 0.572663] pci 0000:01:00.0: bridge window [mem 0x01700000-0x018fffff 64bit pref] [ 0.572716] pci 0000:00:00.0: PCI bridge to [bus 01-ff] [ 0.572735] pci 0000:00:00.0: bridge window [io 0x1000-0x1fff] [ 0.572757] pci 0000:00:00.0: bridge window [mem 0x01100000-0x016fffff] [ 0.572777] pci 0000:00:00.0: bridge window [mem 0x01700000-0x018fffff pref] [ 0.573483] pcieport 0000:00:00.0: Signaling PME with IRQ 296 [ 0.573835] pcieport 0000:00:00.0: AER enabled with IRQ 296 [ 0.574202] pcieport 0000:01:00.0: enabling device (0140 -> 0143) [ 0.576139] pcieport 0000:02:01.0: enabling device (0140 -> 0143) [ 0.578257] pcieport 0000:02:02.0: enabling device (0140 -> 0142) [ 0.581817] pci 0000:03:00.0: enabling device (0140 -> 0142) [ 7.527313] pci 0000:03:00.0: xHCI HW not ready after 5 sec (HC bug?) status = 0x801 [ 7.527485] pci 0000:03:00.0: quirk_usb_early_handoff+0x0/0x80c took 6782847 usecs [ 7.531041] imx-sdma 20ec000.sdma: loaded firmware 3.3 [ 7.536911] imx-pgc-pd imx-pgc-power-domain.0: DMA mask not set [ 7.537029] imx-pgc-pd imx-pgc-power-domain.0: Linked as a consumer to 20dc000.gpc [ 7.537137] imx-pgc-pd imx-pgc-power-domain.1: DMA mask not set [ 7.539524] 21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 63, base_baud = 5000000) is a IMX [ 8.735339] console [ttymxc1] enabled [ 8.740143] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 64, base_baud = 5000000) is a IMX [ 8.766636] brd: module loaded [ 8.786902] loop: module loaded [ 8.791356] at24 2-0050: 4096 byte 24c32 EEPROM, writable, 1 bytes/write [ 8.801418] da9062 2-0058: Device detected (device-ID: 0x62, var-ID: 0x22, DA9062) [ 8.836209] vdd_snvs: Bringing 3100000uV into 3000000-3000000uV [ 8.842493] random: fast init done [ 8.849376] vdd_high: Bringing 3100000uV into 3000000-3000000uV [ 8.859173] vdd_eth_io: Bringing 2600000uV into 2500000-2500000uV [ 8.868280] vdd_emmc: Bringing 1900000uV into 1800000-1800000uV [ 8.879983] ahci-imx 2200000.sata: fsl,transmit-level-mV not specified, using 00000024 [ 8.887987] ahci-imx 2200000.sata: fsl,transmit-boost-mdB not specified, using 00000480 [ 8.896071] ahci-imx 2200000.sata: fsl,transmit-atten-16ths not specified, using 00002000 [ 8.904307] ahci-imx 2200000.sata: fsl,receive-eq-mdB not specified, using 05000000 [ 8.915070] ahci-imx 2200000.sata: SSS flag set, parallel bus scan disabled [ 8.922155] ahci-imx 2200000.sata: AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl platform mode [ 8.931006] ahci-imx 2200000.sata: flags: ncq sntf stag pm led clo only pmp pio slum part ccc apst [ 8.942593] scsi host0: ahci-imx [ 8.946389] ata1: SATA max UDMA/133 mmio [mem 0x02200000-0x02203fff] port 0x100 irq 67 [ 8.962342] m25p80 spi0.0: n25q128a13 (16384 Kbytes) [ 8.969007] spi_imx 2008000.ecspi: probed [ 8.974411] libphy: Fixed MDIO Bus: probed [ 8.979382] CAN device driver interface [ 8.986038] usbcore: registered new interface driver asix [ 8.991578] usbcore: registered new interface driver ax88179_178a [ 8.997747] usbcore: registered new interface driver cdc_ether [ 9.003697] usbcore: registered new interface driver net1080 [ 9.009430] usbcore: registered new interface driver cdc_subset [ 9.015466] usbcore: registered new interface driver zaurus [ 9.021189] usbcore: registered new interface driver cdc_ncm [ 9.026862] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 9.033434] ehci-pci: EHCI PCI platform driver [ 9.038000] ehci-platform: EHCI generic platform driver [ 9.043770] ehci-mxc: Freescale On-Chip EHCI Host driver [ 9.049668] usbcore: registered new interface driver usb-storage [ 9.058946] imx_usb 2184000.usb: Linked as a consumer to regulator.14 [ 9.071501] imx_usb 2184200.usb: Linked as a consumer to regulator.13 [ 9.081344] ci_hdrc ci_hdrc.1: EHCI Host Controller [ 9.086283] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 1 [ 9.120413] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00 [ 9.127076] hub 1-0:1.0: USB hub found [ 9.130967] hub 1-0:1.0: 1 port detected [ 9.139528] da9063-rtc da9062-rtc: DMA mask not set [ 9.154230] da9063-rtc da9062-rtc: rtc core: registered da9063-rtc as rtc1 [ 9.169336] rtc-m41t80 0-0068: registered as rtc0 [ 9.176016] snvs_rtc 20cc000.snvs:snvs-rtc-lp: rtc core: registered 20cc000.snvs:snvs-rtc-lp as rtc2 [ 9.185537] i2c /dev entries driver [ 9.194316] Bluetooth: HCI UART driver ver 2.3 [ 9.198784] Bluetooth: HCI UART protocol H4 registered [ 9.204831] sdhci: Secure Digital Host Controller Interface driver [ 9.211078] sdhci: Copyright(c) Pierre Ossman [ 9.215449] sdhci-pltfm: SDHCI platform and OF driver helper [ 9.222674] sdhci-esdhc-imx 2190000.usdhc: Got CD GPIO [ 9.261834] mmc0: SDHCI controller on 2190000.usdhc [2190000.usdhc] using ADMA [ 9.270559] sdhci-esdhc-imx 219c000.usdhc: Linked as a consumer to regulator.23 [ 9.312317] mmc1: SDHCI controller on 219c000.usdhc [219c000.usdhc] using ADMA [ 9.321406] leds-pca953x 0-0062: setting platform data [ 9.329555] leds-pca953x 0-0062: gpios 508...511 [ 9.342193] caam 2100000.caam: Entropy delay = 3200 [ 9.384183] mmc1: new DDR MMC card at address 0001 [ 9.391491] mmcblk3: mmc1:0001 Q2J55L 7.09 GiB [ 9.397946] mmcblk3boot0: mmc1:0001 Q2J55L partition 1 16.0 MiB [ 9.405996] mmcblk3boot1: mmc1:0001 Q2J55L partition 2 16.0 MiB [ 9.407887] caam 2100000.caam: Instantiated RNG4 SH0 [ 9.412372] mmcblk1rpmb: mmc1:0001 Q2J55L partition 3 4.00 MiB, chardev (247:0) [ 9.426692] mmcblk3: p1 p2 [ 9.450457] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [ 9.457449] ata1.00: ATA-10: ADATA SU800NS38, R0427AC, max UDMA/133 [ 9.463784] ata1.00: 250069680 sectors, multi 16: LBA48 NCQ (depth 32) [ 9.468646] caam 2100000.caam: Instantiated RNG4 SH1 [ 9.470985] ata1.00: configured for UDMA/133 [ 9.475356] caam 2100000.caam: device ID = 0x0a16010000000000 (Era 4) [ 9.480309] scsi 0:0:0:0: Direct-Access ATA ADATA SU800NS38 7AC PQ: 0 ANSI: 5 [ 9.486109] caam 2100000.caam: job rings = 2, qi = 0 [ 9.500440] usb 1-1: new high-speed USB device number 2 using ci_hdrc [ 9.502828] sd 0:0:0:0: [sda] 250069680 512-byte logical blocks: (128 GB/119 GiB) [ 9.514605] sd 0:0:0:0: [sda] Write Protect is off [ 9.519428] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 9.519615] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 9.525366] caam algorithms registered in /proc/crypto [ 9.531304] sda: sda1 sda2 [ 9.539319] sd 0:0:0:0: [sda] Attached SCSI disk [ 9.539813] caam_jr 2101000.jr0: registering rng-caam [ 9.549942] hidraw: raw HID events driver (C) Jiri Kosina [ 9.555665] usbcore: registered new interface driver usbhid [ 9.561283] usbhid: USB HID core driver [ 9.568887] NET: Registered protocol family 10 [ 9.575051] Segment Routing with IPv6 [ 9.578866] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver [ 9.585961] NET: Registered protocol family 17 [ 9.590479] can: controller area network core (rev 20170425 abi 9) [ 9.596811] NET: Registered protocol family 29 [ 9.601308] can: raw protocol (rev 20170425) [ 9.605592] can: broadcast manager protocol (rev 20170425 t) [ 9.611298] can: netlink gateway (rev 20170425) max_hops=1 [ 9.617070] 8021q: 802.1Q VLAN Support v1.8 [ 9.621374] Key type dns_resolver registered [ 9.626321] vddarm: supplied by vdd_arm [ 9.631239] cpu cpu0: Linked as a consumer to regulator.4 [ 9.636701] vddpu: supplied by vdd_soc [ 9.641499] cpu cpu0: Linked as a consumer to regulator.5 [ 9.646962] vddsoc: supplied by vdd_soc [ 9.651884] cpu cpu0: Linked as a consumer to regulator.6 [ 9.665622] cpu cpu0: Not using anatop LDO's: enabling LDO bypass [ 9.695470] Registering SWP/SWPB emulation handler [ 9.701162] Loading compiled-in X.509 certificates [ 9.701528] hub 1-1:1.0: USB hub found [ 9.709899] hub 1-1:1.0: 4 ports detected [ 9.724555] imx-pgc-pd imx-pgc-power-domain.1: Linked as a consumer to regulator.5 [ 9.732273] imx-pgc-pd imx-pgc-power-domain.1: Linked as a consumer to 20dc000.gpc [ 9.740632] imx_thermal tempmon: Automotive CPU temperature grade - max:125C critical:120C passive:115C [ 9.753112] rtc-m41t80 0-0068: hctosys: unable to read the hardware clock [ 9.760548] VCC_CAM0: disabling [ 9.763698] flexcan1-reg: disabling [ 9.767197] usb_otg_vbus: disabling [ 9.770727] peb-display: disabling [ 9.775283] vdd_eth_io: disabling [ 9.797362] EXT4-fs (mmcblk3p2): mounted filesystem with ordered data mode. Opts: (null) [ 9.805576] VFS: Mounted root (ext4 filesystem) on device 179:2. [ 9.814229] devtmpfs: mounted [ 9.819797] Freeing unused kernel memory: 1024K [ 9.840589] Run /sbin/init as init process [ 9.953030] EXT4-fs (mmcblk3p2): re-mounted. Opts: (null) [ 10.040419] usb 1-1.4: new high-speed USB device number 3 using ci_hdrc [ 10.191698] hub 1-1.4:1.0: USB hub found [ 10.195822] hub 1-1.4:1.0: 4 ports detected [ 10.520393] usb 1-1.4.1: new full-speed USB device number 4 using ci_hdrc [ 10.715913] cfg80211: Loading compiled-in X.509 certificates for regulatory database [ 10.717475] usbcore: registered new interface driver usbserial_generic [ 10.730640] usbserial: USB Serial support registered for generic [ 10.748984] usbcore: registered new interface driver ftdi_sio [ 10.754914] usbserial: USB Serial support registered for FTDI USB Serial Device [ 10.762608] ftdi_sio 1-1.4.1:1.0: FTDI USB Serial Device converter detected [ 10.769803] usb 1-1.4.1: Detected FT232RL [ 10.772021] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' [ 10.774616] usb 1-1.4.1: FTDI USB Serial Device converter now attached to ttyUSB0 [ 10.849210] ath10k_pci 0000:04:00.0: enabling device (0140 -> 0142) [ 10.856167] ath10k_pci 0000:04:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0 [ 10.989785] xhci_hcd 0000:03:00.0: xHCI Host Controller [ 10.995277] xhci_hcd 0000:03:00.0: new USB bus registered, assigned bus number 2 [ 11.148145] ath10k_pci 0000:04:00.0: qca988x hw2.0 target 0x4100016c chip_id 0x043202ff sub 0000:0000 [ 11.157413] ath10k_pci 0000:04:00.0: kconfig debug 1 debugfs 1 tracing 0 dfs 1 testmode 1 [ 11.167090] ath10k_pci 0000:04:00.0: firmware ver 10.2.4-1.0-00037 api 5 features no-p2p,raw-mode,mfp,allows-mesh-bcast crc32 a4a52adb [ 11.216682] ath10k_pci 0000:04:00.0: board_file api 1 bmi_id N/A crc32 bebc7c08 <This below rcu_stall don't happen if I blacklist xhci_pci.ko module and insmod it after uPD720202 firmware load) [ 32.040328] rcu: INFO: rcu_sched self-detected stall on CPU [ 32.045923] rcu: 2-....: (1998 ticks this GP) idle=2de/1/0x40000002 softirq=177/177 fqs=897 [ 32.054448] rcu: (t=2100 jiffies g=-887 q=34) [ 32.058988] NMI backtrace for cpu 2 [ 32.062486] CPU: 2 PID: 190 Comm: modprobe Not tainted 4.19.25-bsp-yocto-i.mx6-pd18.1.1 #3 [ 32.070753] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 32.077313] [<c0110738>] (unwind_backtrace) from [<c010bbf4>] (show_stack+0x10/0x14) [ 32.085073] [<c010bbf4>] (show_stack) from [<c0835458>] (dump_stack+0x8c/0xac) [ 32.092309] [<c0835458>] (dump_stack) from [<c083b8a0>] (nmi_cpu_backtrace+0x84/0xbc) [ 32.100150] [<c083b8a0>] (nmi_cpu_backtrace) from [<c083b9dc>] (nmi_trigger_cpumask_backtrace+0x104/0x130) [ 32.109820] [<c083b9dc>] (nmi_trigger_cpumask_backtrace) from [<c0179ee4>] (rcu_dump_cpu_stacks+0x94/0xc8) [ 32.119490] [<c0179ee4>] (rcu_dump_cpu_stacks) from [<c01792f0>] (rcu_check_callbacks+0x66c/0x844) [ 32.128463] [<c01792f0>] (rcu_check_callbacks) from [<c017ea08>] (update_process_times+0x30/0x6c) [ 32.137352] [<c017ea08>] (update_process_times) from [<c01904cc>] (tick_sched_timer+0x5c/0xc0) [ 32.145976] [<c01904cc>] (tick_sched_timer) from [<c017fd0c>] (__hrtimer_run_queues+0x148/0x208) [ 32.154772] [<c017fd0c>] (__hrtimer_run_queues) from [<c0180158>] (hrtimer_interrupt+0x134/0x2cc) [ 32.163655] [<c0180158>] (hrtimer_interrupt) from [<c010f770>] (twd_handler+0x2c/0x38) [ 32.171588] [<c010f770>] (twd_handler) from [<c016ce38>] (handle_percpu_devid_irq+0x98/0x14c) [ 32.180123] [<c016ce38>] (handle_percpu_devid_irq) from [<c0167a24>] (generic_handle_irq+0x20/0x34) [ 32.189182] [<c0167a24>] (generic_handle_irq) from [<c0168020>] (__handle_domain_irq+0x64/0xe0) [ 32.197890] [<c0168020>] (__handle_domain_irq) from [<c041de38>] (gic_handle_irq+0x4c/0xa8) [ 32.206252] [<c041de38>] (gic_handle_irq) from [<c0101a2c>] (__irq_svc+0x6c/0x90) [ 32.213739] Exception stack(0xeca3dbd0 to 0xeca3dc18) [ 32.218798] dbc0: 00000002 00000090 7fffd540 00000002 [ 32.226982] dbe0: 00446304 ec4b2140 f0d7c020 00000000 000346dc c0b21818 ec087078 c0d05148 [ 32.235164] dc00: 000014e4 eca3dc20 c0832c1c bf1c6c74 20030013 ffffffff [ 32.241850] [<c0101a2c>] (__irq_svc) from [<bf1c6c74>] (xhci_reset+0x9c/0x1d8 [xhci_hcd]) [ 32.250101] [<bf1c6c74>] (xhci_reset [xhci_hcd]) from [<bf1c7568>] (xhci_gen_setup+0x1e8/0x480 [xhci_hcd]) [ 32.259802] [<bf1c7568>] (xhci_gen_setup [xhci_hcd]) from [<bf1efaa8>] (xhci_pci_setup+0x40/0x8c [xhci_pci]) [ 32.269651] [<bf1efaa8>] (xhci_pci_setup [xhci_pci]) from [<c05b6f68>] (usb_add_hcd+0x258/0x764) [ 32.278454] [<c05b6f68>] (usb_add_hcd) from [<c05c9270>] (usb_hcd_pci_probe+0x204/0x368) [ 32.286562] [<c05c9270>] (usb_hcd_pci_probe) from [<bf1ef0b0>] (xhci_pci_probe+0x2c/0x174 [xhci_pci]) [ 32.295801] [<bf1ef0b0>] (xhci_pci_probe [xhci_pci]) from [<c0440a38>] (pci_device_probe+0xa4/0x138) [ 32.304954] [<c0440a38>] (pci_device_probe) from [<c04bf6d8>] (really_probe+0x1f0/0x2bc) [ 32.313055] [<c04bf6d8>] (really_probe) from [<c04bf904>] (driver_probe_device+0x5c/0x160) [ 32.321330] [<c04bf904>] (driver_probe_device) from [<c04bfae4>] (__driver_attach+0xdc/0xe0) [ 32.329776] [<c04bfae4>] (__driver_attach) from [<c04bd9ec>] (bus_for_each_dev+0x70/0xb4) [ 32.337966] [<c04bd9ec>] (bus_for_each_dev) from [<c04beb58>] (bus_add_driver+0x194/0x1f8) [ 32.346241] [<c04beb58>] (bus_add_driver) from [<c04c0444>] (driver_register+0x74/0x108) [ 32.354342] [<c04c0444>] (driver_register) from [<c0102698>] (do_one_initcall+0x6c/0x1ac) [ 32.362535] [<c0102698>] (do_one_initcall) from [<c0198db0>] (do_init_module+0x58/0x1f0) [ 32.370636] [<c0198db0>] (do_init_module) from [<c019b0b4>] (load_module+0x2104/0x230c) [ 32.378647] [<c019b0b4>] (load_module) from [<c019b504>] (sys_finit_module+0xbc/0xdc) [ 32.386485] [<c019b504>] (sys_finit_module) from [<c01011d4>] (__sys_trace_return+0x0/0x10) [ 32.394838] Exception stack(0xeca3dfa8 to 0xeca3dff0) [ 32.399897] dfa0: 00000000 01253268 00000003 000b8342 00000000 012530b8 [ 32.408081] dfc0: 00000000 01253268 01252e28 0000017b 000c9cb0 00000001 012530b8 012532a8 [ 32.416262] dfe0: befaac38 befaac28 00027a1c b6f1dbf0 [ 49.524438] xhci_hcd 0000:03:00.0: can't setup: -110 [ 49.529455] xhci_hcd 0000:03:00.0: USB bus 2 deregistered [ 49.534981] xhci_hcd 0000:03:00.0: init 0000:03:00.0 fail, -110 [ 49.541005] xhci_hcd: probe of 0000:03:00.0 failed with error -110 [ 49.577131] ath10k_pci 0000:04:00.0: htt-ver 2.1 wmi-op 5 htt-op 2 cal otp max-sta 128 raw 0 hwcrypto 1 [ 49.674185] random: dd: uninitialized urandom read (512 bytes read) [ 49.708707] ath: EEPROM regdomain: 0x6a [ 49.708716] ath: EEPROM indicates we should expect a direct regpair map [ 49.708728] ath: Country alpha2 being used: 00 [ 49.708731] ath: Regpair used: 0x6a [ 49.756484] random: dbus-uuidgen: uninitialized urandom read (12 bytes read) [ 49.763653] random: dbus-uuidgen: uninitialized urandom read (8 bytes read) [ 65.289080] urandom_read: 2 callbacks suppressed [ 65.289088] random: ssh-keygen: uninitialized urandom read (32 bytes read) [ 65.330131] random: sshd: uninitialized urandom read (32 bytes read) [ 360.132197] random: crng init done < Loading of uPD720202 firmware here> # cd /upd72020x-load/ # sh ./check-and-init Doing the upload bus = 3 dev = 0 fct = 0 fname = ./K2026.mem got firmware version: 200000 ERROR: ROM doesnt exist no EEPROM installed STATUS: enabling firmware upload STATUS: performing firmware upload STATUS: finishing firmware upload STATUS: confirming firmware upload ======> PASSED [ 505.546414] pci 0000:03:00.0: 2.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s x1 link at 0000:00:00.0 (capable of 4.000 Gb/s with 5 GT/s x1 link) [ 505.604961] pci 0000:03:00.0: BAR 0: assigned [mem 0x01100000-0x01101fff 64bit] [ 505.612430] pci 0000:03:00.0: enabling device (0000 -> 0002) [ 505.618456] xhci_hcd 0000:03:00.0: xHCI Host Controller [ 505.623743] xhci_hcd 0000:03:00.0: new USB bus registered, assigned bus number 2 [ 505.638427] xhci_hcd 0000:03:00.0: hcc params 0x014051cf hci version 0x100 quirks 0x0000000100000090 [ 505.650036] hub 2-0:1.0: USB hub found [ 505.654043] hub 2-0:1.0: 2 ports detected [ 505.659855] xhci_hcd 0000:03:00.0: xHCI Host Controller [ 505.665354] xhci_hcd 0000:03:00.0: new USB bus registered, assigned bus number 3 [ 505.672879] xhci_hcd 0000:03:00.0: Host supports USB 3.0 SuperSpeed [ 505.679421] usb usb3: We don't know the algorithms for LPM for this host, disabling LPM. [ 505.688555] hub 3-0:1.0: USB hub found [ 505.692429] hub 3-0:1.0: 2 ports detected # < Doing lsusb -v never returned, had to kill it > # /root/lsusb -v # dmesg [ 573.066231] Unhandled fault: imprecise external abort (0x1406) at 0x02012628 [ 573.075162] pgd = 2544a558 [ 573.080731] [02012628] *pgd=84185831 [ 573.087184] Internal error: : 1406 [#1] SMP ARM [ 573.094304] Modules linked in: xhci_pci xhci_hcd ath10k_pci ath10k_core mac80211 ath ftdi_sio usbserial cfg80211 [ 573.107353] CPU: 3 PID: 504 Comm: lsusb Not tainted 4.19.25-bsp-yocto-i.mx6-pd18.1.1 #3 [ 573.117951] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 573.126681] PC is at xhci_bus_resume+0xbc/0x534 [xhci_hcd] [ 573.134973] LR is at xhci_bus_resume+0x9c/0x534 [xhci_hcd] [ 573.143263] pc : [<bf1d7248>] lr : [<bf1d7228>] psr: 200f0093 [ 573.151610] sp : ec923cc8 ip : 00000000 fp : ffffe000 [ 573.158830] r10: 00000002 r9 : ec703800 r8 : 00000004 [ 573.166138] r7 : ecad3000 r6 : 00000000 r5 : eca2ff80 r4 : ecad3000 [ 573.174659] r3 : 00000000 r2 : 00000000 r1 : 00000018 r0 : 200f0013 [ 573.183272] Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none [ 573.192835] Control: 10c5387d Table: 3ca0804a DAC: 00000051 [ 573.200750] Process lsusb (pid: 504, stack limit = 0x8e3ed15c) [ 573.208750] Stack: (0xec923cc8 to 0xec924000) [ 573.215370] 3cc0: 00000001 00000008 ec736460 00000340 ecad3140 200f0013 [ 573.226150] 3ce0: ecad3170 ec135d40 006000c0 ecad3000 ec703800 eca6c878 c05be2e8 00000004 [ 573.237089] 3d00: ec703800 c015a638 ffffe000 c05b8c4c ec703800 00000410 eca6c878 c05be2e8 [ 573.247255] 3d20: ec2b3f00 c05bd35c ec703878 00000000 eca6c878 c04ca280 00000004 ec703878 [ 573.257509] 3d40: c05be2e8 eca6c878 c0d03d00 ec2b3f00 ec703800 c015a638 ffffe000 c04ca334 [ 573.267676] 3d60: ec703878 c05be2e8 eca6c878 c04c9e6c ec923dcc ec703914 00000001 c02273e0 [ 573.277844] 3d80: eccb4ac0 ec08d080 ecafdd34 793301cc ec31a358 ec703878 00000004 ec7038f0 [ 573.288011] 3da0: 600f0013 ec2b3f00 ec703800 00000000 ec2b3f00 c04ca0a8 ecae2380 ec703878 [ 573.298178] 3dc0: ec703878 ec7038ac ec2b3f00 c05bd994 ecae2380 ec9f1550 ec703878 c05c27bc [ 573.308345] 3de0: c0db5dc4 c0964384 00000000 ec9f1550 c0d05148 ec2b3f00 00000000 c02209a4 [ 573.318512] 3e00: 00000080 793301cc ec2b3f00 ec9f1550 00020002 00000000 c02208cc ec2b3f08 [ 573.328679] 3e20: 00000000 c0218874 ec923ec0 00000000 00020002 00000000 00000006 ea4775d8 [ 573.338847] 3e40: 00000000 c022afb4 00000000 c0d05148 00000000 00000002 00000041 ffffe000 [ 573.349099] 3e60: 00000000 00000000 00000000 ec923e6c ec923e6c 793301cc 00000002 ec9f1550 [ 573.359267] 3e80: ec34e710 ea477660 00000023 0200f603 00000023 793301cc 00000023 00000009 [ 573.369520] 3ea0: ec923f70 c0d05148 00000001 fffff000 ec922000 00000142 0000000c c022d148 [ 573.379687] 3ec0: ec34e710 ea477660 d1ef8db8 00000003 ec907021 00000000 00000000 ea24f088 [ 573.389856] 3ee0: ec9f1550 00000101 00000002 00000040 00000000 00000000 00000000 ec923f00 [ 573.400109] 3f00: 600b0013 ea1146e8 00000000 ec02a180 006000c0 c084ad90 006000c0 00000ff0 [ 573.410362] 3f20: 0000000c 793301cc 00000009 00000020 ec907000 00000000 00000000 00000002 [ 573.420529] 3f40: ffffff9c c023bbdc 000a0002 793301cc ffffff9c 00000009 c0d05148 ffffff9c [ 573.430784] 3f60: ec907000 c0219ef0 00000142 ec923fb0 00020002 00000000 00000006 00000100 [ 573.441038] 3f80: 00000001 793301cc be9c8950 00000000 02018390 00000142 c0101204 ec922000 [ 573.451292] 3fa0: 00000142 c01011d4 be9c8950 00000000 ffffff9c be9c8950 000a0002 00000000 [ 573.461546] 3fc0: be9c8950 00000000 02018390 00000142 0200f368 00000002 b6f65e6c 0000000c [ 573.471799] 3fe0: 00000000 be9c8918 b6f967a0 b6e96bc8 800f0010 ffffff9c 00000000 00000000 [ 573.482096] [<bf1d7248>] (xhci_bus_resume [xhci_hcd]) from [<c05b8c4c>] (hcd_bus_resume+0x54/0x1a4) [ 573.493967] [<c05b8c4c>] (hcd_bus_resume) from [<c05bd35c>] (usb_resume_both+0xa0/0x134) [ 573.504653] [<c05bd35c>] (usb_resume_both) from [<c04ca280>] (__rpm_callback+0x158/0x1ec) [ 573.515335] [<c04ca280>] (__rpm_callback) from [<c04ca334>] (rpm_callback+0x20/0x80) [ 573.523082] [<c04ca334>] (rpm_callback) from [<c04c9e6c>] (rpm_resume+0x4d8/0x6b4) [ 573.530656] [<c04c9e6c>] (rpm_resume) from [<c04ca0a8>] (__pm_runtime_resume+0x60/0x8c) [ 573.538665] [<c04ca0a8>] (__pm_runtime_resume) from [<c05bd994>] (usb_autoresume_device+0x14/0x3c) [ 573.547634] [<c05bd994>] (usb_autoresume_device) from [<c05c27bc>] (usbdev_open+0xb0/0x214) [ 573.555993] [<c05c27bc>] (usbdev_open) from [<c02209a4>] (chrdev_open+0xd8/0x1ac) [ 573.563488] [<c02209a4>] (chrdev_open) from [<c0218874>] (do_dentry_open+0x114/0x38c) [ 573.571328] [<c0218874>] (do_dentry_open) from [<c022afb4>] (path_openat+0x2b0/0x1304) [ 573.579251] [<c022afb4>] (path_openat) from [<c022d148>] (do_filp_open+0x6c/0xd8) [ 573.586741] [<c022d148>] (do_filp_open) from [<c0219ef0>] (do_sys_open+0x150/0x1f0) [ 573.594405] [<c0219ef0>] (do_sys_open) from [<c01011d4>] (__sys_trace_return+0x0/0x10) [ 573.602322] Exception stack(0xec923fa8 to 0xec923ff0) [ 573.607378] 3fa0: be9c8950 00000000 ffffff9c be9c8950 000a0002 00000000 [ 573.615558] 3fc0: be9c8950 00000000 02018390 00000142 0200f368 00000002 b6f65e6c 0000000c [ 573.623737] 3fe0: 00000000 be9c8918 b6f967a0 b6e96bc8 [ 573.628795] Code: e597214c e5926000 e3a02000 ee072f9a (e3c66004) [ 573.634894] ---[ end trace 2247f322516b4181 ]--- # Thanks in advance, -- Fawad Lateef