pi@raspberrypi:~ $ dmesg [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 5.4.83-v7l+ (dom@buildbot) (gcc version 8.4.0 (Ubuntu/Linaro 8.4.0-3ubuntu1)) #1379 SMP Mon Dec 14 13:11:54 GMT 2020 [ 0.000000] CPU: ARMv7 Processor [410fd083] revision 3 (ARMv7), cr=30c5383d [ 0.000000] CPU: div instructions available: patching division code [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache [ 0.000000] OF: fdt: Machine model: Raspberry Pi Compute Module 4 Rev 1.0 [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] Reserved memory: created CMA memory pool at 0x000000002ac00000, size 64 MiB [ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool [ 0.000000] On node 0 totalpages: 504832 [ 0.000000] DMA zone: 2304 pages used for memmap [ 0.000000] DMA zone: 0 pages reserved [ 0.000000] DMA zone: 196608 pages, LIFO batch:63 [ 0.000000] HighMem zone: 308224 pages, LIFO batch:63 [ 0.000000] percpu: Embedded 20 pages/cpu s49804 r8192 d23924 u81920 [ 0.000000] pcpu-alloc: s49804 r8192 d23924 u81920 alloc=20*4096 [ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 502528 [ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=0 bcm2708_fb.fbheight=0 bcm2708_fb.fbswap=1 smsc95xx.macaddr=DC:A6:32:DD:35:23 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=ttyS0,115200 console=tty1 root=PARTUUID=4547512c-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear) [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off [ 0.000000] software IO TLB: mapped [mem 0x25400000-0x29400000] (64MB) [ 0.000000] Memory: 1844792K/2019328K available (10240K kernel code, 739K rwdata, 2816K rodata, 2048K init, 854K bss, 109000K reserved, 65536K cma-reserved, 1232896K highmem) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1 [ 0.000000] ftrace: allocating 31115 entries in 61 pages [ 0.000000] rcu: Hierarchical RCU implementation. [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies. [ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16 [ 0.000000] GIC: Using split EOI/Deactivate mode [ 0.000000] random: get_random_bytes called from start_kernel+0x344/0x518 with crng_init=0 [ 0.000007] sched_clock: 32 bits at 1000kHz, resolution 1000ns, wraps every 2147483647500ns [ 0.000022] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275 ns [ 0.000099] bcm2835: system timer (irq = 17) [ 0.000749] arch_timer: cp15 timer(s) running at 54.00MHz (phys). [ 0.000765] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0xc743ce346, max_idle_ns: 440795203123 ns [ 0.000782] sched_clock: 56 bits at 54MHz, resolution 18ns, wraps every 4398046511102ns [ 0.000794] Switching to timer-based delay loop, resolution 18ns [ 0.001038] Console: colour dummy device 80x30 [ 0.001071] printk: console [tty1] enabled [ 0.001123] Calibrating delay loop (skipped), value calculated using timer frequency.. 108.00 BogoMIPS (lpj=540000) [ 0.001145] pid_max: default: 32768 minimum: 301 [ 0.001293] LSM: Security Framework initializing [ 0.001486] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes, linear) [ 0.001510] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes, linear) [ 0.002861] Disabling memory control group subsystem [ 0.002984] CPU: Testing write buffer coherency: ok [ 0.003500] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 [ 0.004415] Setting up static identity map for 0x200000 - 0x20003c [ 0.004623] rcu: Hierarchical SRCU implementation. [ 0.005308] smp: Bringing up secondary CPUs ... [ 0.006500] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001 [ 0.007831] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002 [ 0.009103] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003 [ 0.009262] smp: Brought up 1 node, 4 CPUs [ 0.009279] SMP: Total of 4 processors activated (432.00 BogoMIPS). [ 0.009292] CPU: All CPU(s) started in HYP mode. [ 0.009304] CPU: Virtualization extensions available. [ 0.010125] devtmpfs: initialized [ 0.024179] VFP support v0.3: implementor 41 architecture 3 part 40 variant 8 rev 0 [ 0.024449] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.024478] futex hash table entries: 1024 (order: 4, 65536 bytes, linear) [ 0.026466] pinctrl core: initialized pinctrl subsystem [ 0.027441] NET: Registered protocol family 16 [ 0.031531] DMA: preallocated 1024 KiB pool for atomic coherent allocations [ 0.032132] audit: initializing netlink subsys (disabled) [ 0.032392] audit: type=2000 audit(0.030:1): state=initialized audit_enabled=0 res=1 [ 0.033559] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers. [ 0.033574] hw-breakpoint: maximum watchpoint size is 8 bytes. [ 0.033898] Serial: AMBA PL011 UART driver [ 0.037348] bcm2835-mbox fe00b880.mailbox: mailbox enabled [ 0.060810] raspberrypi-firmware soc:firmware: Attached to firmware from 2021-01-08 14:31, variant start [ 0.070824] raspberrypi-firmware soc:firmware: Firmware hash is 194a85abd768c7334bbadc3f1911c10a7d18ed14 [ 0.125121] bcm2835-dma fe007000.dma: DMA legacy API manager, dmachans=0x1 [ 0.128986] vgaarb: loaded [ 0.129439] SCSI subsystem initialized [ 0.129676] usbcore: registered new interface driver usbfs [ 0.129733] usbcore: registered new interface driver hub [ 0.129855] usbcore: registered new device driver usb [ 0.130184] usb_phy_generic phy: phy supply vcc not found, using dummy regulator [ 0.132094] clocksource: Switched to clocksource arch_sys_counter [ 0.890708] VFS: Disk quotas dquot_6.6.0 [ 0.890807] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) [ 0.890992] FS-Cache: Loaded [ 0.891202] CacheFiles: Loaded [ 0.901474] thermal_sys: Registered thermal governor 'step_wise' [ 0.901826] NET: Registered protocol family 2 [ 0.902784] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear) [ 0.902816] TCP established hash table entries: 8192 (order: 3, 32768 bytes, linear) [ 0.902878] TCP bind hash table entries: 8192 (order: 4, 65536 bytes, linear) [ 0.902950] TCP: Hash tables configured (established 8192 bind 8192) [ 0.903103] UDP hash table entries: 512 (order: 2, 16384 bytes, linear) [ 0.903135] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes, linear) [ 0.903391] NET: Registered protocol family 1 [ 0.904125] RPC: Registered named UNIX socket transport module. [ 0.904138] RPC: Registered udp transport module. [ 0.904151] RPC: Registered tcp transport module. [ 0.904164] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 0.904185] PCI: CLS 0 bytes, default 64 [ 0.906163] hw perfevents: enabled with armv7_cortex_a15 PMU driver, 7 counters available [ 0.908380] Initialise system trusted keyrings [ 0.908636] workingset: timestamp_bits=14 max_order=19 bucket_order=5 [ 0.919795] FS-Cache: Netfs 'nfs' registered for caching [ 0.920559] NFS: Registering the id_resolver key type [ 0.920603] Key type id_resolver registered [ 0.920616] Key type id_legacy registered [ 0.920639] nfs4filelayout_init: NFSv4 File Layout Driver Registering... [ 0.921736] Key type asymmetric registered [ 0.921750] Asymmetric key parser 'x509' registered [ 0.921938] bounce: pool size: 64 pages [ 0.921990] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249) [ 0.922283] io scheduler mq-deadline registered [ 0.922297] io scheduler kyber registered [ 0.926391] GPIO line 507 (ant1) hogged as output/high [ 0.927801] GPIO line 511 (ant2) hogged as output/low [ 0.929101] brcm-pcie fd500000.pcie: host bridge /scb/pcie@7d500000 ranges: [ 0.929125] brcm-pcie fd500000.pcie: No bus range found for /scb/pcie@7d500000, using [bus 00-ff] [ 0.929197] brcm-pcie fd500000.pcie: MEM 0x0600000000..0x0603ffffff -> 0x00f8000000 [ 0.929268] brcm-pcie fd500000.pcie: IB MEM 0x0000000000..0x007fffffff -> 0x0400000000 [ 1.522124] brcm-pcie fd500000.pcie: link down [ 1.522600] bcm2708_fb soc:fb: Unable to determine number of FBs. Disabling driver. [ 1.522642] bcm2708_fb: probe of soc:fb failed with error -2 [ 1.529145] iproc-rng200 fe104000.rng: hwrng registered [ 1.529484] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB) [ 1.530158] vc-sm: Videocore shared memory driver [ 1.530729] gpiomem-bcm2835 fe200000.gpiomem: Initialised: Registers at 0xfe200000 [ 1.543166] brd: module loaded [ 1.555750] loop: module loaded [ 1.557171] Loading iSCSI transport class v2.0-870. [ 1.559189] libphy: Fixed MDIO Bus: probed [ 1.559813] bcmgenet fd580000.ethernet: failed to get enet clock [ 1.559832] bcmgenet fd580000.ethernet: GENET 5.0 EPHY: 0x0000 [ 1.559856] bcmgenet fd580000.ethernet: failed to get enet-wol clock [ 1.559877] bcmgenet fd580000.ethernet: failed to get enet-eee clock [ 1.559905] bcmgenet: Skipping UMAC reset [ 1.572132] libphy: bcmgenet MII bus: probed [ 1.652206] unimac-mdio unimac-mdio.-19: Broadcom UniMAC MDIO bus [ 1.653206] usbcore: registered new interface driver r8152 [ 1.653285] usbcore: registered new interface driver lan78xx [ 1.653345] usbcore: registered new interface driver smsc95xx [ 1.653854] dwc_otg: version 3.00a 10-AUG-2012 (platform bus) [ 1.654144] dwc_otg: FIQ enabled [ 1.654156] dwc_otg: NAK holdoff enabled [ 1.654169] dwc_otg: FIQ split-transaction FSM enabled [ 1.654185] Module dwc_common_port init [ 1.654639] usbcore: registered new interface driver uas [ 1.654712] usbcore: registered new interface driver usb-storage [ 1.654923] mousedev: PS/2 mouse device common for all mice [ 1.656781] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer [ 1.660269] sdhci: Secure Digital Host Controller Interface driver [ 1.660281] sdhci: Copyright(c) Pierre Ossman [ 1.660923] mmc-bcm2835 fe300000.mmcnr: could not get clk, deferring probe [ 1.661496] sdhci-pltfm: SDHCI platform and OF driver helper [ 1.665385] ledtrig-cpu: registered to indicate activity on CPUs [ 1.665694] hidraw: raw HID events driver (C) Jiri Kosina [ 1.665867] usbcore: registered new interface driver usbhid [ 1.665879] usbhid: USB HID core driver [ 1.667614] vchiq: vchiq_init_state: slot_zero = (ptrval) [ 1.669587] [vc_sm_connected_init]: start [ 1.678465] [vc_sm_connected_init]: end - returning 0 [ 1.680650] Initializing XFRM netlink socket [ 1.680689] NET: Registered protocol family 17 [ 1.680798] Key type dns_resolver registered [ 1.681236] Registering SWP/SWPB emulation handler [ 1.681597] registered taskstats version 1 [ 1.681617] Loading compiled-in X.509 certificates [ 1.682196] Key type ._fscrypt registered [ 1.682209] Key type .fscrypt registered [ 1.692867] uart-pl011 fe201000.serial: cts_event_workaround enabled [ 1.692952] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 29, base_baud = 0) is a PL011 rev2 [ 1.699090] bcm2835-power bcm2835-power: Broadcom BCM2835 power domains driver [ 1.700075] mmc-bcm2835 fe300000.mmcnr: mmc_debug:0 mmc_debug2:0 [ 1.700090] mmc-bcm2835 fe300000.mmcnr: DMA channel allocated [ 1.766327] mmc0: SDHCI controller on fe340000.emmc2 [fe340000.emmc2] using ADMA [ 1.769294] of_cfs_init [ 1.769554] of_cfs_init: OK [ 1.770595] Waiting for root device PARTUUID=4547512c-02... [ 1.897605] mmc0: new ultra high speed DDR50 SDHC card at address 59b4 [ 1.898565] mmcblk0: mmc0:59b4 SD16G 14.6 GiB [ 1.900749] mmcblk0: p1 p2 [ 1.919997] EXT4-fs (mmcblk0p2): INFO: recovery required on readonly filesystem [ 1.920012] EXT4-fs (mmcblk0p2): write access will be enabled during recovery [ 1.965908] random: fast init done [ 2.063166] EXT4-fs (mmcblk0p2): recovery complete [ 2.065501] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null) [ 2.065574] VFS: Mounted root (ext4 filesystem) readonly on device 179:2. [ 2.066358] devtmpfs: mounted [ 2.074992] Freeing unused kernel memory: 2048K [ 2.075293] Run /sbin/init as init process [ 2.438097] systemd[1]: System time before build time, advancing clock. [ 2.535159] NET: Registered protocol family 10 [ 2.536535] Segment Routing with IPv6 [ 2.557460] systemd[1]: systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid) [ 2.558503] systemd[1]: Detected architecture arm. [ 2.597398] systemd[1]: Set hostname to . [ 3.242527] random: systemd: uninitialized urandom read (16 bytes read) [ 3.253024] random: systemd: uninitialized urandom read (16 bytes read) [ 3.253117] systemd[1]: Reached target Swap. [ 3.253645] random: systemd: uninitialized urandom read (16 bytes read) [ 3.254547] systemd[1]: Listening on Journal Socket. [ 3.267472] systemd[1]: Starting Set the console keyboard layout... [ 3.274229] systemd[1]: Mounting Kernel Debug File System... [ 3.275703] systemd[1]: Listening on udev Kernel Socket. [ 3.282501] systemd[1]: Starting Create list of required static device nodes for the current kernel... [ 3.284038] systemd[1]: Listening on Journal Socket (/dev/log). [ 3.405324] i2c /dev entries driver [ 3.873912] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null) [ 3.963829] systemd-journald[111]: Received request to flush runtime journal from PID 1 [ 4.500784] rpivid-mem feb00000.hevc-decoder: rpivid-hevcmem initialised: Registers at 0xfeb00000 length 0x00010000 [ 4.504827] rpivid-mem feb10000.rpivid-local-intc: rpivid-intcmem initialised: Registers at 0xfeb10000 length 0x00001000 [ 4.505342] rpivid-mem feb20000.h264-decoder: rpivid-h264mem initialised: Registers at 0xfeb20000 length 0x00010000 [ 4.505787] rpivid-mem feb30000.vp9-decoder: rpivid-vp9mem initialised: Registers at 0xfeb30000 length 0x00010000 [ 4.534819] mc: Linux media interface: v0.10 [ 4.535435] vc_sm_cma: module is from the staging directory, the quality is unknown, you have been warned. [ 4.537573] bcm2835_vc_sm_cma_probe: Videocore shared memory driver [ 4.537595] [vc_sm_connected_init]: start [ 4.558673] [vc_sm_connected_init]: installed successfully [ 4.569525] videodev: Linux video capture interface: v2.00 [ 4.598861] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned. [ 4.600622] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned. [ 4.602667] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned. [ 4.605146] bcm2835_isp: module is from the staging directory, the quality is unknown, you have been warned. [ 4.612000] pinctrl-bcm2835 fe200000.gpio: /soc/gpio@7e200000/audio_pins: missing brcm,pins property [ 4.612034] bcm2835_audio: probe of bcm2835_audio failed with error -22 [ 4.616443] bcm2835_codec: module is from the staging directory, the quality is unknown, you have been warned. [ 4.621439] bcm2835-isp bcm2835-isp: Device node output[0] registered as /dev/video13 [ 4.622472] bcm2835-isp bcm2835-isp: Device node capture[0] registered as /dev/video14 [ 4.623450] bcm2835-isp bcm2835-isp: Device node capture[1] registered as /dev/video15 [ 4.624993] bcm2835-isp bcm2835-isp: Device node stats[2] registered as /dev/video16 [ 4.625024] bcm2835-isp bcm2835-isp: Register output node 0 with media controller [ 4.625047] bcm2835-isp bcm2835-isp: Register capture node 1 with media controller [ 4.625067] bcm2835-isp bcm2835-isp: Register capture node 2 with media controller [ 4.625087] bcm2835-isp bcm2835-isp: Register capture node 3 with media controller [ 4.625318] bcm2835-isp bcm2835-isp: Loaded V4L2 bcm2835-isp [ 4.628167] bcm2835-codec bcm2835-codec: Device registered as /dev/video10 [ 4.628208] bcm2835-codec bcm2835-codec: Loaded V4L2 decode [ 4.637225] bcm2835-codec bcm2835-codec: Device registered as /dev/video11 [ 4.637267] bcm2835-codec bcm2835-codec: Loaded V4L2 encode [ 4.643606] bcm2835_v4l2: module is from the staging directory, the quality is unknown, you have been warned. [ 4.661209] bcm2835-codec bcm2835-codec: Device registered as /dev/video12 [ 4.661254] bcm2835-codec bcm2835-codec: Loaded V4L2 isp [ 4.744067] dwc2 fe980000.usb: fe980000.usb supply vusb_d not found, using dummy regulator [ 4.744203] dwc2 fe980000.usb: fe980000.usb supply vusb_a not found, using dummy regulator [ 4.795982] dwc2 fe980000.usb: DWC OTG Controller [ 4.796043] dwc2 fe980000.usb: new USB bus registered, assigned bus number 1 [ 4.796109] dwc2 fe980000.usb: irq 31, io mem 0xfe980000 [ 4.796515] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04 [ 4.796533] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 4.796549] usb usb1: Product: DWC OTG Controller [ 4.796565] usb usb1: Manufacturer: Linux 5.4.83-v7l+ dwc2_hsotg [ 4.796580] usb usb1: SerialNumber: fe980000.usb [ 4.797332] hub 1-0:1.0: USB hub found [ 4.797405] hub 1-0:1.0: 1 port detected [ 5.232210] usb 1-1: new high-speed USB device number 2 using dwc2 [ 5.482652] usb 1-1: New USB device found, idVendor=1a40, idProduct=0101, bcdDevice= 1.00 [ 5.482672] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0 [ 5.482689] usb 1-1: Product: USB 2.0 Hub [MTT] [ 5.483395] hub 1-1:1.0: USB hub found [ 5.483510] hub 1-1:1.0: 4 ports detected [ 5.702538] usb 1-1-port3: over-current change #1 [ 5.942322] usb 1-1-port3: over-current condition [ 6.142179] usb 1-1.4: new high-speed USB device number 3 using dwc2 [ 6.373205] usb 1-1.4: New USB device found, idVendor=0403, idProduct=6011, bcdDevice= 8.00 [ 6.373226] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 6.373242] usb 1-1.4: Product: Quad RS232-HS [ 6.373258] usb 1-1.4: Manufacturer: FTDI [ 6.466103] usbcore: registered new interface driver usbserial_generic [ 6.466178] usbserial: USB Serial support registered for generic [ 6.475599] usbcore: registered new interface driver ftdi_sio [ 6.475972] usbserial: USB Serial support registered for FTDI USB Serial Device [ 6.476447] ftdi_sio 1-1.4:1.0: FTDI USB Serial Device converter detected [ 6.476871] usb 1-1.4: Detected FT4232H [ 6.478551] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB0 [ 6.480093] ftdi_sio 1-1.4:1.1: FTDI USB Serial Device converter detected [ 6.480562] usb 1-1.4: Detected FT4232H [ 6.485121] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB1 [ 6.486601] ftdi_sio 1-1.4:1.2: FTDI USB Serial Device converter detected [ 6.487059] usb 1-1.4: Detected FT4232H [ 6.487517] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB2 [ 6.488582] ftdi_sio 1-1.4:1.3: FTDI USB Serial Device converter detected [ 6.488760] usb 1-1.4: Detected FT4232H [ 6.489865] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB3 [ 6.911522] random: crng init done [ 6.911535] random: 7 urandom warning(s) missed due to ratelimiting [ 7.326900] uart-pl011 fe201000.serial: no DMA platform data [ 7.467961] 8021q: 802.1Q VLAN Support v1.8 [ 7.502278] Adding 102396k swap on /var/swap. Priority:-2 extents:1 across:102396k SSFS [ 7.575122] cfg80211: Loading compiled-in X.509 certificates for regulatory database [ 7.620128] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' [ 7.715853] bcmgenet: Skipping UMAC reset [ 7.717513] bcmgenet fd580000.ethernet: configuring instance for external RGMII [ 7.717723] bcmgenet fd580000.ethernet eth0: Link is Down [ 12.952317] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off [ 12.952366] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready pi@raspberrypi:~ $ lsusb -t /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 4: Dev 3, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 480M |__ Port 4: Dev 3, If 1, Class=Vendor Specific Class, Driver=ftdi_sio, 480M |__ Port 4: Dev 3, If 2, Class=Vendor Specific Class, Driver=ftdi_sio, 480M |__ Port 4: Dev 3, If 3, Class=Vendor Specific Class, Driver=ftdi_sio, 480M