Hi Zoran, here is the cat /proc/cmdline output of my cm3- *coherent_pool=1M snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 snd_bcm2835.enable_headphones=1 bcm2708_fb.fbwidth=720 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 smsc95xx.macaddr=B8:27:EB:AD:85:CA vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait kgdboc=ttyAMA0,115200 * Earlier my issue was that I was no getting */dev/ttyS0* terminal in my yocto image for cm3. But going through the web I got that setting 1 to *CONFIG_SERIAL_8250_RUNTIME_UARTS* solved that issue and now I'm getting ttyS0 in my /dev directory.
But now another issue I'm facing when I'm enabling cosole via this ttsS0 port i.e. *[ 13.280639] ttyS ttyS0: 2 input overrun(s) * here is my dmesg output: [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 5.4.64-v7 (oe-user@oe-host) (gcc version 9.3.0 (GCC)) #1 SMP Fri Sep 11 12:57:30 UTC 2020 [ 0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d [ 0.000000] CPU: div instructions available: patching division code [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt: Machine model: Raspberry Pi Compute Module 3 Rev 1.0 [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] Reserved memory: created CMA memory pool at 0x37400000, size 64 MiB [ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool [ 0.000000] On node 0 totalpages: 242688 [ 0.000000] Normal zone: 2133 pages used for memmap [ 0.000000] Normal zone: 0 pages reserved [ 0.000000] Normal zone: 242688 pages, LIFO batch:63 [ 0.000000] percpu: Embedded 20 pages/cpu s50060 r8192 d23668 u81920 [ 0.000000] pcpu-alloc: s50060 r8192 d23668 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: 240555 [ 0.000000] Kernel command line: coherent_pool=1M snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 snd_bcm2835.enable_headphones=1 bcm2708_fb.fbwidth=720 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 smsc95xx.macaddr=B8:27:EB:AD:85:CA vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait kgdboc=ttyAMA0,115200 [ 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] Memory: 880444K/970752K available (9216K kernel code, 716K rwdata, 2684K rodata, 1024K init, 849K bss, 24772K reserved, 65536K cma-reserved) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1 [ 0.000000] ftrace: allocating 29805 entries in 59 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] random: get_random_bytes called from start_kernel+0x328/0x508 with crng_init=0 [ 0.000000] arch_timer: cp15 timer(s) running at 19.20MHz (phys). [ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns [ 0.000006] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns [ 0.000020] Switching to timer-based delay loop, resolution 52ns [ 0.000288] Console: colour dummy device 80x30 [ 0.000885] printk: console [tty1] enabled [ 0.000960] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000) [ 0.001009] pid_max: default: 32768 minimum: 301 [ 0.001232] LSM: Security Framework initializing [ 0.001477] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes, linear) [ 0.001524] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes, linear) [ 0.002936] Disabling memory control group subsystem [ 0.003081] CPU: Testing write buffer coherency: ok [ 0.003674] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 [ 0.004651] Setting up static identity map for 0x100000 - 0x100060 [ 0.004873] rcu: Hierarchical SRCU implementation. [ 0.005586] smp: Bringing up secondary CPUs ... [ 0.006748] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001 [ 0.008417] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002 [ 0.009943] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003 [ 0.010479] smp: Brought up 1 node, 4 CPUs [ 0.010528] SMP: Total of 4 processors activated (153.60 BogoMIPS). [ 0.010557] CPU: All CPU(s) started in HYP mode. [ 0.010582] CPU: Virtualization extensions available. [ 0.011597] devtmpfs: initialized [ 0.027564] VFP support v0.3: implementor 41 architecture 3 part 40 variant 3 rev 4 [ 0.028074] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.028132] futex hash table entries: 1024 (order: 4, 65536 bytes, linear) [ 0.031459] pinctrl core: initialized pinctrl subsystem [ 0.032650] NET: Registered protocol family 16 [ 0.036992] DMA: preallocated 1024 KiB pool for atomic coherent allocations [ 0.041879] audit: initializing netlink subsys (disabled) [ 0.042183] audit: type=2000 audit(0.040:1): state=initialized audit_enabled=0 res=1 [ 0.043730] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers. [ 0.043770] hw-breakpoint: maximum watchpoint size is 8 bytes. [ 0.044019] Serial: AMBA PL011 UART driver [ 0.046056] bcm2835-mbox 3f00b880.mailbox: mailbox enabled [ 0.070160] raspberrypi-firmware soc:firmware: Attached to firmware from 2020-09-11 14:25, variant start [ 0.080196] raspberrypi-firmware soc:firmware: Firmware hash is ecd571f7947fb751a266d8591b0573d4d975fbe6 [ 0.132933] bcm2835-dma 3f007000.dma: DMA legacy API manager, dmachans=0x1 [ 0.135178] SCSI subsystem initialized [ 0.135460] usbcore: registered new interface driver usbfs [ 0.135556] usbcore: registered new interface driver hub [ 0.135703] usbcore: registered new device driver usb [ 0.137691] clocksource: Switched to clocksource arch_sys_counter [ 1.382483] VFS: Disk quotas dquot_6.6.0 [ 1.382646] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) [ 1.382869] FS-Cache: Loaded [ 1.383168] CacheFiles: Loaded [ 1.394807] thermal_sys: Registered thermal governor 'step_wise' [ 1.395207] NET: Registered protocol family 2 [ 1.396283] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear) [ 1.396360] TCP established hash table entries: 8192 (order: 3, 32768 bytes, linear) [ 1.396501] TCP bind hash table entries: 8192 (order: 4, 65536 bytes, linear) [ 1.396713] TCP: Hash tables configured (established 8192 bind 8192) [ 1.396898] UDP hash table entries: 512 (order: 2, 16384 bytes, linear) [ 1.396973] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes, linear) [ 1.397287] NET: Registered protocol family 1 [ 1.398427] RPC: Registered named UNIX socket transport module. [ 1.398462] RPC: Registered udp transport module. [ 1.398488] RPC: Registered tcp transport module. [ 1.398515] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 1.400297] hw perfevents: enabled with armv7_cortex_a7 PMU driver, 7 counters available [ 1.404004] Initialise system trusted keyrings [ 1.404281] workingset: timestamp_bits=14 max_order=18 bucket_order=4 [ 1.416225] FS-Cache: Netfs 'nfs' registered for caching [ 1.416897] NFS: Registering the id_resolver key type [ 1.416978] Key type id_resolver registered [ 1.417005] Key type id_legacy registered [ 1.417043] nfs4filelayout_init: NFSv4 File Layout Driver Registering... [ 1.418451] Key type asymmetric registered [ 1.418482] Asymmetric key parser 'x509' registered [ 1.418551] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249) [ 1.418590] io scheduler mq-deadline registered [ 1.418618] io scheduler kyber registered [ 1.423548] bcm2708_fb soc:fb: FB found 1 display(s) [ 1.437559] Console: switching to colour frame buffer device 90x30 [ 1.446253] bcm2708_fb soc:fb: Registered framebuffer for display 0, size 720x480 [ 1.452896] Serial: 8250/16550 driver, 1 ports, IRQ sharing enabled [ 1.458395] bcm2835-rng 3f104000.rng: hwrng registered [ 1.461812] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB) [ 1.468540] vc-sm: Videocore shared memory driver [ 1.472180] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000 [ 1.489107] brd: module loaded [ 1.505307] loop: module loaded [ 1.509860] Loading iSCSI transport class v2.0-870. [ 1.513862] libphy: Fixed MDIO Bus: probed [ 1.517035] usbcore: registered new interface driver lan78xx [ 1.520267] usbcore: registered new interface driver smsc95xx [ 1.523303] dwc_otg: version 3.00a 10-AUG-2012 (platform bus) [ 2.254610] Core Release: 2.80a [ 2.257707] Setting default values for core params [ 2.260769] Finished setting default values for core params [ 2.464194] Using Buffer DMA mode [ 2.467200] Periodic Transfer Interrupt Enhancement - disabled [ 2.470261] Multiprocessor Interrupt Enhancement - disabled [ 2.473253] OTG VER PARAM: 0, OTG VER FLAG: 0 [ 2.476233] Dedicated Tx FIFOs mode [ 2.479874] WARN::dwc_otg_hcd_init:1072: FIQ DMA bounce buffers: virt = b7504000 dma = 0xf7504000 len=9024 [ 2.486063] FIQ FSM acceleration enabled for : Non-periodic Split Transactions Periodic Split Transactions High-Speed Isochronous Endpoints Interrupt/Control Split Transaction hack enabled [ 2.500574] dwc_otg: Microframe scheduler enabled [ 2.500642] WARN::hcd_init_fiq:457: FIQ on core 1 [ 2.503411] WARN::hcd_init_fiq:458: FIQ ASM at 80728fa4 length 36 [ 2.506123] WARN::hcd_init_fiq:496: MPHI regs_base at bb810000 [ 2.508797] dwc_otg 3f980000.usb: DWC OTG Controller [ 2.511499] dwc_otg 3f980000.usb: new USB bus registered, assigned bus number 1 [ 2.514279] dwc_otg 3f980000.usb: irq 56, io mem 0x00000000 [ 2.517028] Init: Port Power? op_state=1 [ 2.519717] Init: Power Port (0) [ 2.522754] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04 [ 2.528327] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 2.531293] usb usb1: Product: DWC OTG Controller [ 2.534211] usb usb1: Manufacturer: Linux 5.4.64-v7 dwc_otg_hcd [ 2.537146] usb usb1: SerialNumber: 3f980000.usb [ 2.540771] hub 1-0:1.0: USB hub found [ 2.543657] hub 1-0:1.0: 1 port detected [ 2.547238] dwc_otg: FIQ enabled [ 2.547248] dwc_otg: NAK holdoff enabled [ 2.547258] dwc_otg: FIQ split-transaction FSM enabled [ 2.547274] Module dwc_common_port init [ 2.547609] usbcore: registered new interface driver usb-storage [ 2.550721] mousedev: PS/2 mouse device common for all mice [ 2.554936] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer [ 2.560496] sdhci: Secure Digital Host Controller Interface driver [ 2.563302] sdhci: Copyright(c) Pierre Ossman [ 2.566769] sdhost-bcm2835 3f202000.mmc: could not get clk, deferring probe [ 2.570026] sdhci-pltfm: SDHCI platform and OF driver helper [ 2.573709] ledtrig-cpu: registered to indicate activity on CPUs [ 2.576947] hidraw: raw HID events driver (C) Jiri Kosina [ 2.580129] usbcore: registered new interface driver usbhid [ 2.583142] usbhid: USB HID core driver [ 2.586528] ashmem: initialized [ 2.590509] vchiq: vchiq_init_state: slot_zero = (ptrval) [ 2.595277] [vc_sm_connected_init]: start [ 2.605012] [vc_sm_connected_init]: end - returning 0 [ 2.610026] Initializing XFRM netlink socket [ 2.613006] NET: Registered protocol family 17 [ 2.616003] Key type dns_resolver registered [ 2.619492] Registering SWP/SWPB emulation handler [ 2.622506] registered taskstats version 1 [ 2.625154] Loading compiled-in X.509 certificates [ 2.628349] Key type ._fscrypt registered [ 2.630977] Key type .fscrypt registered [ 2.644359] uart-pl011 3f201000.serial: cts_event_workaround enabled [ 2.647220] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 81, base_baud = 0) is a PL011 rev2 [ 2.655430] printk: console [ttyS0] disabled [ 2.658305] 3f215040.serial: ttyS0 at MMIO 0x0 (irq = 53, base_baud = 31250000) is a 16550 [ 3.678083] printk: console [ttyS0] enabled [ 3.685731] KGDB: Registered I/O driver kgdboc [ 3.693806] bcm2835-power bcm2835-power: Broadcom BCM2835 power domains driver [ 3.705593] sdhost: log_buf @ (ptrval) (f7507000) [ 3.761622] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1) [ 3.772680] of_cfs_init [ 3.778301] of_cfs_init: OK [ 3.785362] Waiting for root device /dev/mmcblk0p2... [ 3.797847] Indeed it is in host mode hprt0 = 00021501 [ 3.891131] random: fast init done [ 3.936402] mmc0: new high speed MMC card at address 0001 [ 3.946012] mmcblk0: mmc0:0001 4FTE4R 3.64 GiB [ 3.953973] mmcblk0boot0: mmc0:0001 4FTE4R partition 1 4.00 MiB [ 3.963473] mmcblk0boot1: mmc0:0001 4FTE4R partition 2 4.00 MiB [ 3.972635] mmcblk0rpmb: mmc0:0001 4FTE4R partition 3 512 KiB, chardev (245:0) [ 3.985330] mmcblk0: p1 p2 [ 4.007759] usb 1-1: new high-speed USB device number 2 using dwc_otg [ 4.011189] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null) [ 4.017529] Indeed it is in host mode hprt0 = 00001101 [ 4.031809] VFS: Mounted root (ext4 filesystem) readonly on device 179:2. [ 4.050759] devtmpfs: mounted [ 4.102220] Freeing unused kernel memory: 1024K [ 4.128140] Run /sbin/init as init process [ 4.278133] usb 1-1: New USB device found, idVendor=0424, idProduct=9514, bcdDevice= 2.00 [ 4.292686] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 4.303966] hub 1-1:1.0: USB hub found [ 4.311058] hub 1-1:1.0: 5 ports detected [ 4.647797] usb 1-1.1: new high-speed USB device number 3 using dwc_otg [ 4.730514] udevd[115]: starting version 3.2.9 [ 4.745524] random: udevd: uninitialized urandom read (16 bytes read) [ 4.756762] random: udevd: uninitialized urandom read (16 bytes read) [ 4.766616] random: udevd: uninitialized urandom read (16 bytes read) [ 4.788165] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00, bcdDevice= 2.00 [ 4.802823] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 4.814602] udevd[117]: starting eudev-3.2.9 [ 4.818138] smsc95xx v1.0.6 [ 4.923876] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:ad:85:ca [ 5.161891] i2c /dev entries driver [ 5.216319] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null) [ 5.972781] random: crng init done [ 5.979289] random: 2 urandom warning(s) missed due to ratelimiting [ 6.470391] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup [ 6.480654] ttyS ttyS0: 2 input overrun(s) [ 7.962826] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1 [ 7.973416] ttyS ttyS0: 2 input overrun(s) [ 11.883822] Installing knfsd (copyright (C) 1996 o...@monad.swb.de). [ 11.893705] ttyS ttyS0: 2 input overrun(s) [ 13.268076] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory [ 13.280639] ttyS ttyS0: 2 input overrun(s) [ 13.294215] NFSD: Using legacy client tracking operations. [ 13.304013] NFSD: starting 90-second grace period (net f00004c1) [ 1014.267771] usb 1-1.2: new high-speed USB device number 4 using dwc_otg [ 1014.399220] usb 1-1.2: New USB device found, idVendor=0b95, idProduct=772b, bcdDevice= 0.02 [ 1014.408345] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1014.416278] usb 1-1.2: Product: AX88772B [ 1014.420431] usb 1-1.2: Manufacturer: ASIX Elec. Corp. [ 1014.425889] usb 1-1.2: SerialNumber: 000001 Please assist me if you have some clue regarding this issue. Thanks and Regards.
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