alext-mkrs
commented
5 years ago Got it for IRQs. Interesting page for 32 vs 64 bit. BTW while Edison's version of it was never advertised as 64bit (don't know why), the core/SoC used there was also used in Merrifield phone platform - and there it was officially 64bit from the very beginning (https://ark.intel.com/products/codename/41559/Merrifield?q=merrifield).
Ok, I've found it. Your note about the reset (even though I tested it today to no avail) got me thinking further and I've actually just fallen prey of my specific workflow I used. In short - everything works ok, it's just that reset (cold vs. warm) that makes all the difference. I used the following flow:
- Boot into official image
- Mount the ex-"update" partition, copy the kernel from my build host,
reboot - Boot into U-Boot, start DFU mode (
run do_force_flash_os), flash the U-Boot viadfu-util - Run
resetfrom U-Boot, after it resetsrun edsbootto try to boot into the new kernel. It would hang on that RTC driver
And now if I do a poweroff instead of reset in U-Boot, it would boot normally. The reason is apparently that booting into 3.10-based official image takes up something that isn't cleaned up by a simple warm reset. That's why it didn't come up in my testing earlier today - because I was only getting to the new kernel and U-Boot, never "old kernel->new kernel" - and did come up last week (because I was following the full flow described above).
Okay, mistery solved and luckily nothing to be done here, just remember to do cold resets all the time :)
Now back to 32 vs 64 and non-ACPI vs ACPI. I've noticed on your "ACPI or non-ACPI" page that
Work on providing non-acpi U-Boot patches will end with the release of U-Boot v2018.09
is this still the plan (@andy-shev - probably that's a question to you)? If so I think non-ACPI just makes no sense, I'd rather then join (for real this time) the enablement activity for ACPI, to avoid spending my [rather limited, alas] time for non-ACPI version. There are I guess anyway not that many "production" users of our image right now and it would be more beneficial to get ACPI enabled sooner than drag the non-ACPI around in "somewhat working"/"it boots so probably works" state.
And one more note about 32 vs 64 bits - those instruction-related drawbacks look significant enough, however I wonder if we can actually help it by using a different - targeted at Silvermont, unlike the current one - Yocto compiler optimizations. We currently use core2-*, while according to the file comments, the one for Silvermont would be corei7-* (link). Actually that was exactly the thing I was trying to test when I got into this boot stall problem. Let me proceed with this task then - if you have any specific benchmarks you want me to try, let me know.
All in all, I'm now strongly inclined to ditch 32bit-non-ACPI and focus on fully enabling and stabilizing 64bit-ACPI, unless there's any showstopper there (interrupt delay might be one, but I hope this is just something that needs more detailed investigation/fix).
htot
andy-shev
staroselskii
@htot, let me check something with you - looks like current master built from scratch (no saved state whatsoever, manually removed all the dirs) doesn't boot for me. The kernel boots up until the below and then just stalls, then in a short while the board gets reset by the watchdog timer, and the process repeats endlessly.
Have you seen anything like that? Could you please try building the image from scratch and checking if it boots for you?
Full log inside
``` U-Boot 2018.05 (Jun 17 2018 - 12:44:14 +0000) CPU: x86_64, vendor Intel, device 406a8h DRAM: 980.6 MiB MMC: mmc@ff3fc000: 0, mmc@ff3fa000: 1 Loading Environment from MMC... OK In: serial Out: serial Err: serial Net: No ethernet found. Hit any key to stop autoboot: 0 => => run edsboot 10749632 bytes read in 473 ms (21.7 MiB/s) Valid Boot Flag Setup Size = 0x00003e00 Magic signature found Using boot protocol version 2.0d Linux kernel version 4.16.0-edison-no-acpi-standard (oe-user@oe-host) #1 SMP Sat Jul 21 19:26:21 UTC 2018 Building boot_params at 0x00090000 Loading bzImage at address 100000 (10733760 bytes) Magic signature found Kernel command line: "tty1 console=ttyS2,115200n8 root=/dev/mmcblk1 rootfstype=ext4 systemd.unit=multi-user.target hardware_id=00" Magic signature found Starting kernel ... [ 0.000000] Linux version 4.16.0-edison-no-acpi-standard (oe-user@oe-host) (gcc version 7.3.0 (GCC)) #1 SMP Sat Jul 21 19:26:21 UTC 2018 [ 0.000000] x86/fpu: x87 FPU will use FXSAVE [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x0000000000097fff] usable [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x0000000003ffffff] usable [ 0.000000] BIOS-e820: [mem 0x0000000004000000-0x0000000005ffffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000006000000-0x000000003f4fffff] usable [ 0.000000] BIOS-e820: [mem 0x000000003f500000-0x000000003fffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fec04000-0x00000000fec07fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved [ 0.000000] Notice: NX (Execute Disable) protection cannot be enabled: non-PAE kernel! [ 0.000000] random: fast init done [ 0.000000] SMBIOS 2.6 present. [ 0.000000] DMI: Intel Corporation Merrifield/BODEGA BAY, BIOS 542 2015.01.21:18.19.48 [ 0.000000] e820: last_pfn = 0x3f500 max_arch_pfn = 0x100000 [ 0.000000] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT [ 0.000000] Scanning 1 areas for low memory corruption [ 0.000000] ACPI: Early table checksum verification disabled [ 0.000000] ACPI BIOS Error (bug): A valid RSDP was not found (20180105/tbxfroot-244) [ 0.000000] 129MB HIGHMEM available. [ 0.000000] 883MB LOWMEM available. [ 0.000000] mapped low ram: 0 - 373fe000 [ 0.000000] low ram: 0 - 373fe000 [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x0000000000001000-0x0000000000ffffff] [ 0.000000] Normal [mem 0x0000000001000000-0x00000000373fdfff] [ 0.000000] HighMem [mem 0x00000000373fe000-0x000000003f4fffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000000001000-0x0000000000097fff] [ 0.000000] node 0: [mem 0x0000000000100000-0x0000000003ffffff] [ 0.000000] node 0: [mem 0x0000000006000000-0x000000003f4fffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000003f4fffff] [ 0.000000] Reserved but unavailable: 1 pages [ 0.000000] Using APIC driver default [ 0.000000] SFI: Simple Firmware Interface v0.81 http://simplefirmware.org [ 0.000000] SFI: SYST E31F0, 0060 (v1 INTEL INTELFDK) [ 0.000000] SFI: CPUS E3296, 0020 (v1 INTEL INTELFDK) [ 0.000000] SFI: FREQ E32C2, 0030 (v1 INTEL INTELFDK) [ 0.000000] SFI: MMAP E32FE, 01A4 (v1 INTEL INTELFDK) [ 0.000000] SFI: XSDT E34B0, 002C (v1 INTEL INTELFDK) [ 0.000000] SFI: APIC E353E, 0020 (v1 INTEL INTELFDK) [ 0.000000] SFI: WAKE E356A, 0020 (v2 INTEL INTELFDK) [ 0.000000] SFI: DEVS E359E, 047D (v1 INTEL INTELFDK) [ 0.000000] SFI: GPIO E3A27, 0964 (v1 INTEL INTELFDK) [ 0.000000] SFI: OEMB E4397, 0060 (v5 UMGFDK CFGINFO!) [ 0.000000] SFI: registering lapic[0] [ 0.000000] SFI: registering lapic[2] [ 0.000000] IOAPIC[0]: apic_id 0, version 32, address 0xfec00000, GSI 0-54 [ 0.000000] smpboot: Allowing 2 CPUs, 0 hotplug CPUs [ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff] [ 0.000000] PM: Registered nosave memory: [mem 0x00098000-0x000fffff] [ 0.000000] PM: Registered nosave memory: [mem 0x04000000-0x05ffffff] [ 0.000000] e820: [mem 0x40000000-0xfebfffff] available for PCI devices [ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns [ 0.000000] setup_percpu: NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:2 nr_node_ids:1 [ 0.000000] percpu: Embedded 29 pages/cpu @(ptrval) s87756 r0 d31028 u118784 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 249263 [ 0.000000] Kernel command line: tty1 console=ttyS2,115200n8 root=/dev/mmcblk1 rootfstype=ext4 systemd.unit=multi-user.target hardware_id=00 [ 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] Initializing CPU#0 [ 0.000000] Initializing HighMem for node 0 (000373fe:0003f500) [ 0.000000] Initializing Movable for node 0 (00000000:00000000) [ 0.000000] Memory: 972060K/1004124K available (9562K kernel code, 987K rwdata, 2764K rodata, 8484K init, 620K bss, 32064K reserved, 0K cma-reserved, 132104K highmem) [ 0.000000] virtual kernel memory layout: [ 0.000000] fixmap : 0xfff16000 - 0xfffff000 ( 932 kB) [ 0.000000] cpu_entry : 0xff800000 - 0xff939000 (1252 kB) [ 0.000000] pkmap : 0xff400000 - 0xff800000 (4096 kB) [ 0.000000] vmalloc : 0xf7bfe000 - 0xff3fe000 ( 120 MB) [ 0.000000] lowmem : 0xc0000000 - 0xf73fe000 ( 883 MB) [ 0.000000] .init : 0xcef1d000 - 0xcf766000 (8484 kB) [ 0.000000] .data : 0xceb56930 - 0xcef07f40 (3781 kB) [ 0.000000] .text : 0xce200000 - 0xceb56930 (9562 kB) [ 0.000000] Checking if this processor honours the WP bit even in supervisor mode...Ok. [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 [ 0.000000] Hierarchical RCU implementation. [ 0.000000] RCU event tracing is enabled. [ 0.000000] RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2. [ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2 [ 0.000000] NR_IRQS: 2304, nr_irqs: 512, preallocated irqs: 0 [ 0.000000] Console: colour dummy device 80x25 [ 0.000000] console [ttyS2] enabled [ 0.000000] APIC: Switch to symmetric I/O mode setup [ 0.000000] Enabling APIC mode: Flat. Using 1 I/O APICs [ 0.000000] tsc: Detected 500.000 MHz processor [ 0.000046] tsc: Detected 499.200 MHz TSC [ 0.000048] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0xe642f98297, max_idle_ns: 881590439301 ns [ 0.000410] Calibrating delay loop (skipped), value calculated using timer frequency.. 998.40 BogoMIPS (lpj=499200) [ 0.000676] pid_max: default: 32768 minimum: 301 [ 0.000910] Security Framework initialized [ 0.001000] SELinux: Initializing. [ 0.001000] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes) [ 0.001000] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes) [ 0.001000] CPU: Physical Processor ID: 0 [ 0.001000] CPU: Processor Core ID: 0 [ 0.001000] ENERGY_PERF_BIAS: Set to 'normal', was 'performance' [ 0.001000] ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8) [ 0.001000] mce: CPU supports 6 MCE banks [ 0.001000] CPU0: Thermal monitoring enabled (TM1) [ 0.001000] process: using mwait in idle threads [ 0.001000] Last level iTLB entries: 4KB 48, 2MB 0, 4MB 0 [ 0.001000] Last level dTLB entries: 4KB 128, 2MB 16, 4MB 16, 1GB 0 [ 0.001000] Spectre V2 : Mitigation: Full generic retpoline [ 0.001000] Freeing SMP alternatives memory: 40K [ 0.001000] SFI: MCFG E34F6, 003C (v1 INTEL INTELFDK) [ 0.001000] smpboot: CPU0: Genuine Intel(R) CPU 4000 @ 500MHz (family: 0x6, model: 0x4a, stepping: 0x8) [ 0.001000] Performance Events: PEBS fmt2+, generic architected perfmon, full-width counters, Intel PMU driver. [ 0.001035] ... version: 3 [ 0.001150] ... bit width: 40 [ 0.001264] ... generic registers: 2 [ 0.001376] ... value mask: 000000ffffffffff [ 0.001519] ... max period: 0000007fffffffff [ 0.001662] ... fixed-purpose events: 3 [ 0.001773] ... event mask: 0000000700000003 [ 0.002164] Hierarchical SRCU implementation. [ 0.008695] smp: Bringing up secondary CPUs ... [ 0.009550] x86: Booting SMP configuration: [ 0.009671] .... node #0, CPUs: #1 [ 0.001000] Initializing CPU#1 [ 0.010213] smp: Brought up 1 node, 2 CPUs [ 0.010213] smpboot: Max logical packages: 1 [ 0.010262] smpboot: Total of 2 processors activated (1996.80 BogoMIPS) [ 0.011456] devtmpfs: initialized [ 0.014290] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns [ 0.014454] kworker/u4:0 (20) used greatest stack depth: 7084 bytes left [ 0.014560] futex hash table entries: 512 (order: 3, 32768 bytes) [ 0.015085] pinctrl core: initialized pinctrl subsystem [ 0.015522] SFI: SFI sysfs interfaces init success [ 0.016245] RTC time: 8:37:37, date: 07/22/18 [ 0.016872] NET: Registered protocol family 16 [ 0.017677] audit: initializing netlink subsys (disabled) [ 0.018145] audit: type=2000 audit(1532248657.018:1): state=initialized audit_enabled=0 res=1 [ 0.019550] cpuidle: using governor menu [ 0.021055] Using generic wifi platform data [ 0.021898] PCI: MMCONFIG for domain 0000 [bus 00-00] at [mem 0x3f500000-0x3f5fffff] (base 0x3f500000) [ 0.022030] PCI: MMCONFIG at [mem 0x3f500000-0x3f5fffff] reserved in E820 [ 0.022211] PCI: Using MMCONFIG for extended config space [ 0.022356] Intel MID platform detected, using MID PCI ops [ 0.022505] PCI: Using configuration type 1 for base access [ 0.029676] kworker/u4:1 (68) used greatest stack depth: 6828 bytes left [ 0.063381] HugeTLB registered 4.00 MiB page size, pre-allocated 0 pages [ 0.065515] ACPI: Interpreter disabled. [ 0.065760] bcm43xx-vmmc-regulator: Failed to request enable GPIO96: -517 [ 0.065956] reg-fixed-voltage reg-fixed-voltage.0.auto: Failed to register regulator: -517 [ 0.066364] vgaarb: loaded [ 0.067105] SCSI subsystem initialized [ 0.067881] usbcore: registered new interface driver usbfs [ 0.068210] usbcore: registered new interface driver hub [ 0.068500] usbcore: registered new device driver usb [ 0.068931] pps_core: LinuxPPS API ver. 1 registered [ 0.069048] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti
[ 0.069340] PTP clock support registered
[ 0.070233] EDAC MC: Ver: 3.0.0
[ 0.070992] Advanced Linux Sound Architecture Driver Initialized.
[ 0.071112] PCI: Probing PCI hardware
[ 0.071391] PCI host bridge to bus 0000:00
[ 0.071526] pci_bus 0000:00: root bus resource [io 0x0000-0xffff]
[ 0.071700] pci_bus 0000:00: root bus resource [mem 0x00000000-0xffffffff]
[ 0.071888] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[ 0.088621] Bluetooth: Core ver 2.22
[ 0.088799] NET: Registered protocol family 31
[ 0.088928] Bluetooth: HCI device and connection manager initialized
[ 0.089036] Bluetooth: HCI socket layer initialized
[ 0.089178] Bluetooth: L2CAP socket layer initialized
[ 0.089376] Bluetooth: SCO socket layer initialized
[ 0.089542] NetLabel: Initializing
[ 0.089642] NetLabel: domain hash size = 128
[ 0.089761] NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO
[ 0.090053] NetLabel: unlabeled traffic allowed by default
[ 0.091548] clocksource: Switched to clocksource tsc-early
[ 0.166406] VFS: Disk quotas dquot_6.6.0
[ 0.166625] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.167178] pnp: PnP ACPI: disabled
[ 0.182698] NET: Registered protocol family 2
[ 0.183774] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes)
[ 0.184006] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.184346] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[ 0.184671] TCP: Hash tables configured (established 8192 bind 8192)
[ 0.184966] UDP hash table entries: 512 (order: 2, 16384 bytes)
[ 0.185224] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
[ 0.185632] NET: Registered protocol family 1
[ 0.186459] RPC: Registered named UNIX socket transport module.
[ 0.186625] RPC: Registered udp transport module.
[ 0.186755] RPC: Registered tcp transport module.
[ 0.186884] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.634512] DMA-API: preallocated 65536 debug entries
[ 0.634661] DMA-API: debugging enabled by kernel config
[ 0.635481] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0xe642f98297, max_idle_ns: 881590439301 ns
[ 0.635796] clocksource: Switched to clocksource tsc
[ 0.636223] platform rtc_cmos: registered platform RTC device (no PNP device found)
[ 0.638402] Scanning for low memory corruption every 60 seconds
[ 0.640171] pci 0000:00:04.1: Registered Bluetooth device: hci_bcm
[ 0.643195] Initialise system trusted keyrings
[ 0.643857] workingset: timestamp_bits=30 max_order=18 bucket_order=0
[ 0.660208] NFS: Registering the id_resolver key type
[ 0.660379] Key type id_resolver registered
[ 0.660499] Key type id_legacy registered
[ 0.669266] Key type asymmetric registered
[ 0.669393] Asymmetric key parser 'x509' registered
[ 0.669600] bounce: pool size: 64 pages
[ 0.669809] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 248)
[ 0.670047] io scheduler noop registered
[ 0.670162] io scheduler deadline registered
[ 0.670642] io scheduler cfq registered (default)
[ 0.670778] io scheduler mq-deadline registered
[ 0.670906] io scheduler kyber registered
[ 0.682296] dw_dmac_pci 0000:00:15.0: DesignWare DMA Controller, 8 channels
[ 0.684366] hsu_dma_pci 0000:00:05.0: Found HSU DMA, 12 channels
[ 0.685147] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 0.689055] 8250_mid: probe of 0000:00:04.0 failed with error -16
[ 0.689886] 0000:00:04.1: ttyS0 at MMIO 0xff010080 (irq = 28, base_baud = 1843200) is a TI16750
[ 0.691575] 0000:00:04.2: ttyS1 at MMIO 0xff010100 (irq = 29, base_baud = 1843200) is a TI16750
[ 0.692954] console [ttyS2] disabled
[ 0.693158] 0000:00:04.3: ttyS2 at MMIO 0xff010180 (irq = 54, base_baud = 1843200) is a TI16750
[ 1.931247] console [ttyS2] enabled
[ 1.935683] Non-volatile memory driver v1.3
[ 1.940487] Linux agpgart interface v0.103
[ 1.955127] loop: module loaded
[ 1.960427] e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI
[ 1.966588] e100: Copyright(c) 1999-2006 Intel Corporation
[ 1.972246] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
[ 1.979334] e1000: Copyright (c) 1999-2006 Intel Corporation.
[ 1.985241] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[ 1.991112] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 1.997216] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.4.0-k
[ 2.004216] igb: Copyright (c) 2007-2014 Intel Corporation.
[ 2.009941] sky2: driver version 1.30
[ 2.014404] usbcore: registered new interface driver r8152
[ 2.020049] usbcore: registered new interface driver asix
[ 2.025556] usbcore: registered new interface driver ax88179_178a
[ 2.031755] usbcore: registered new interface driver cdc_ether
[ 2.037696] usbcore: registered new interface driver net1080
[ 2.043462] usbcore: registered new interface driver cdc_subset
[ 2.049490] usbcore: registered new interface driver zaurus
[ 2.055173] usbcore: registered new interface driver MOSCHIP usb-ethernet driver
[ 2.062716] usbcore: registered new interface driver cdc_ncm
[ 2.069260] dwc3 dwc3.1.auto: Configuration mismatch. dr_mode forced to host
[ 2.077667] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 2.084256] ehci-pci: EHCI PCI platform driver
[ 2.088843] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 2.095078] ohci-pci: OHCI PCI platform driver
[ 2.099652] uhci_hcd: USB Universal Host Controller Interface driver
[ 2.106421] xhci-hcd xhci-hcd.2.auto: xHCI Host Controller
[ 2.112273] xhci-hcd xhci-hcd.2.auto: new USB bus registered, assigned bus number 1
[ 2.120190] xhci-hcd xhci-hcd.2.auto: hcc params 0x0220f06c hci version 0x100 quirks 0x02010010
[ 2.129000] xhci-hcd xhci-hcd.2.auto: irq 34, io mem 0xf9100000
[ 2.135382] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 2.142234] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.149501] usb usb1: Product: xHCI Host Controller
[ 2.154417] usb usb1: Manufacturer: Linux 4.16.0-edison-no-acpi-standard xhci-hcd
[ 2.161932] usb usb1: SerialNumber: xhci-hcd.2.auto
[ 2.167571] hub 1-0:1.0: USB hub found
[ 2.171430] hub 1-0:1.0: 1 port detected
[ 2.175937] xhci-hcd xhci-hcd.2.auto: xHCI Host Controller
[ 2.181729] xhci-hcd xhci-hcd.2.auto: new USB bus registered, assigned bus number 2
[ 2.189547] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
[ 2.197888] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003
[ 2.204728] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.211985] usb usb2: Product: xHCI Host Controller
[ 2.216898] usb usb2: Manufacturer: Linux 4.16.0-edison-no-acpi-standard xhci-hcd
[ 2.224414] usb usb2: SerialNumber: xhci-hcd.2.auto
[ 2.230064] hub 2-0:1.0: USB hub found
[ 2.233897] hub 2-0:1.0: 1 port detected
[ 2.238788] usbcore: registered new interface driver usblp
[ 2.244474] usbcore: registered new interface driver usb-storage
[ 2.250681] usbcore: registered new interface driver pl2303
[ 2.256361] usbserial: USB Serial support registered for pl2303
```