树莓派0w开机串口输出

留存，以后再分析

[   11.151934] sysrq: SysRq : Resetting
[   11.156878] CPU0: stopping
[   11.161194] CPU3: stopping
[   11.165478] CPU2: stopping
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.19.75-v7+ (dom@buildbot) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611)) #1270 SMP Tue Sep 24 18:45:11 BST 2019
[    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 3 Model B Rev 1.2
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] cma: Reserved 8 MiB at 0x3ac00000
[    0.000000] random: get_random_bytes called from start_kernel+0xac/0x4b4 with crng_init=0
[    0.000000] percpu: Embedded 17 pages/cpu s39488 r8192 d21952 u69632
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 240555
[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  console=ttyS0,115200 console=tty1 root=PARTUUID=6c586e13-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
[    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: 939088K/970752K available (8192K kernel code, 629K rwdata, 2176K rodata, 1024K init, 821K bss, 23472K reserved, 8192K cma-reserved)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
[    0.000000]     vmalloc : 0xbb800000 - 0xff800000   (1088 MB)
[    0.000000]     lowmem  : 0x80000000 - 0xbb400000   ( 948 MB)
[    0.000000]     modules : 0x7f000000 - 0x80000000   (  16 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)   ( 630 kB)
[    0.000000]        .bss : 0x(ptrval) - 0x(ptrval)   ( 822 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] ftrace: allocating 26399 entries in 78 pages
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    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
[    0.000007] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
[    0.000023] Switching to timer-based delay loop, resolution 52ns
[    0.000290] Console: colour dummy device 80x30
[    0.000904] console [tty1] enabled
[    0.000967] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)
[    0.001013] pid_max: default: 32768 minimum: 301
[    0.001370] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.001406] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.002343] CPU: Testing write buffer coherency: ok
[    0.002824] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.003499] Setting up static identity map for 0x100000 - 0x10003c
[    0.003665] rcu: Hierarchical SRCU implementation.
[    0.004479] smp: Bringing up secondary CPUs ...
[    0.005340] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.006263] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[    0.007125] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[    0.007247] smp: Brought up 1 node, 4 CPUs
[    0.007328] SMP: Total of 4 processors activated (153.60 BogoMIPS).
[    0.007352] CPU: All CPU(s) started in HYP mode.
[    0.007372] CPU: Virtualization extensions available.
[    0.008365] devtmpfs: initialized
[    0.021324] VFP support v0.3: implementor 41 architecture 3 part 40 variant 3 rev 4
[    0.021598] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.021647] futex hash table entries: 1024 (order: 4, 65536 bytes)
[    0.022266] pinctrl core: initialized pinctrl subsystem
[    0.023153] NET: Registered protocol family 16
[    0.026071] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[    0.031702] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[    0.031738] hw-breakpoint: maximum watchpoint size is 8 bytes.
[    0.031960] Serial: AMBA PL011 UART driver
[    0.034262] bcm2835-mbox 3f00b880.mailbox: mailbox enabled
[    0.069172] bcm2835-dma 3f007000.dma: DMA legacy API manager at (ptrval), dmachans=0x1
[    0.070904] SCSI subsystem initialized
[    0.071146] usbcore: registered new interface driver usbfs
[    0.071221] usbcore: registered new interface driver hub
[    0.071334] usbcore: registered new device driver usb
[    0.090117] raspberrypi-firmware soc:firmware: Attached to firmware from 2019-09-24 17:37, variant start
[    0.100388] raspberrypi-firmware soc:firmware: Firmware hash is 6820edeee4ef3891b95fc01cf02a7abd7ca52f17
[    0.111666] clocksource: Switched to clocksource arch_sys_counter
[    0.201176] VFS: Disk quotas dquot_6.6.0
[    0.201285] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.201498] FS-Cache: Loaded
[    0.201761] CacheFiles: Loaded
[    0.211803] NET: Registered protocol family 2
[    0.212588] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes)
[    0.212652] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[    0.212782] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[    0.212986] TCP: Hash tables configured (established 8192 bind 8192)
[    0.213139] UDP hash table entries: 512 (order: 2, 16384 bytes)
[    0.213206] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
[    0.213540] NET: Registered protocol family 1
[    0.214159] RPC: Registered named UNIX socket transport module.
[    0.214186] RPC: Registered udp transport module.
[    0.214208] RPC: Registered tcp transport module.
[    0.214230] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.215840] hw perfevents: enabled with armv7_cortex_a7 PMU driver, 7 counters available
[    0.218876] Initialise system trusted keyrings
[    0.219086] workingset: timestamp_bits=14 max_order=18 bucket_order=4
[    0.228927] FS-Cache: Netfs 'nfs' registered for caching
[    0.229516] NFS: Registering the id_resolver key type
[    0.229561] Key type id_resolver registered
[    0.229583] Key type id_legacy registered
[    0.229615] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[    0.231961] Key type asymmetric registered
[    0.231989] Asymmetric key parser 'x509' registered
[    0.232056] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
[    0.232239] io scheduler noop registered
[    0.232263] io scheduler deadline registered (default)
[    0.232465] io scheduler cfq registered
[    0.232489] io scheduler mq-deadline registered (default)
[    0.232514] io scheduler kyber registered
[    0.235697] bcm2708_fb soc:fb: FB found 1 display(s)
[    0.244700] Console: switching to colour frame buffer device 82x26
[    0.251538] bcm2708_fb soc:fb: Registered framebuffer for display 0, size 656x416
[    0.257311] Serial: 8250/16550 driver, 1 ports, IRQ sharing enabled
[    0.261298] bcm2835-rng 3f104000.rng: hwrng registered
[    0.264056] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB)
[    0.269417] vc-sm: Videocore shared memory driver
[    0.272319] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000
[    0.288256] brd: module loaded
[    0.300971] loop: module loaded
[    0.304140] Loading iSCSI transport class v2.0-870.
[    0.307320] libphy: Fixed MDIO Bus: probed
[    0.309818] usbcore: registered new interface driver lan78xx
[    0.312395] usbcore: registered new interface driver smsc95xx
[    0.314837] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[    0.342719] dwc_otg 3f980000.usb: base=(ptrval)
[    0.545417] Core Release: 2.80a
[    0.547874] Setting default values for core params
[    0.550376] Finished setting default values for core params
[    0.753164] Using Buffer DMA mode
[    0.755568] Periodic Transfer Interrupt Enhancement - disabled
[    0.757981] Multiprocessor Interrupt Enhancement - disabled
[    0.760367] OTG VER PARAM: 0, OTG VER FLAG: 0
[    0.762735] Dedicated Tx FIFOs mode
[    0.765430] WARN::dwc_otg_hcd_init:1045: FIQ DMA bounce buffers: virt = bad04000 dma = 0xfad04000 len=9024
[    0.770010] FIQ FSM acceleration enabled for :
[    0.770010] Non-periodic Split Transactions
[    0.770010] Periodic Split Transactions
[    0.770010] High-Speed Isochronous Endpoints
[    0.770010] Interrupt/Control Split Transaction hack enabled
[    0.780987] WARN::hcd_init_fiq:457: FIQ on core 1
[    0.783219] WARN::hcd_init_fiq:458: FIQ ASM at 80655664 length 36
[    0.785433] WARN::hcd_init_fiq:497: MPHI regs_base at bb810000
[    0.787693] dwc_otg 3f980000.usb: DWC OTG Controller
[    0.789956] dwc_otg 3f980000.usb: new USB bus registered, assigned bus number 1
[    0.792298] dwc_otg 3f980000.usb: irq 56, io mem 0x00000000
[    0.794604] Init: Port Power? op_state=1
[    0.796844] Init: Power Port (0)
[    0.799258] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 4.19
[    0.803778] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    0.806190] usb usb1: Product: DWC OTG Controller
[    0.808552] usb usb1: Manufacturer: Linux 4.19.75-v7+ dwc_otg_hcd
[    0.810970] usb usb1: SerialNumber: 3f980000.usb
[    0.813937] hub 1-0:1.0: USB hub found
[    0.816208] hub 1-0:1.0: 1 port detected
[    0.819265] usbcore: registered new interface driver usb-storage
[    0.821773] mousedev: PS/2 mouse device common for all mice
[    0.824957] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer
[    0.827583] bcm2835-cpufreq: min=600000 max=1200000
[    0.830415] sdhci: Secure Digital Host Controller Interface driver
[    0.832852] sdhci: Copyright(c) Pierre Ossman
[    0.835625] mmc-bcm2835 3f300000.mmcnr: could not get clk, deferring probe
[    0.838536] sdhost-bcm2835 3f202000.mmc: could not get clk, deferring probe
[    0.841218] sdhci-pltfm: SDHCI platform and OF driver helper
[    0.845342] ledtrig-cpu: registered to indicate activity on CPUs
[    0.848116] hidraw: raw HID events driver (C) Jiri Kosina
[    0.850886] usbcore: registered new interface driver usbhid
[    0.853552] usbhid: USB HID core driver
[    0.856870] vchiq: vchiq_init_state: slot_zero = (ptrval), is_master = 0
[    0.861002] [vc_sm_connected_init]: start
[    0.869766] [vc_sm_connected_init]: end - returning 0
[    0.873352] Initializing XFRM netlink socket
[    0.875787] NET: Registered protocol family 17
[    0.878296] Key type dns_resolver registered
[    0.881108] Registering SWP/SWPB emulation handler
[    0.884248] registered taskstats version 1
[    0.886660] Loading compiled-in X.509 certificates
[    0.896340] uart-pl011 3f201000.serial: cts_event_workaround enabled
[    0.898869] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 81, base_baud = 0) is a PL011 rev2
[    0.905438] console [ttyS0] disabled
[    0.907878] 3f215040.serial: ttyS0 at MMIO 0x0 (irq = 53, base_baud = 31250000) is a 16550
[    1.934808] console [ttyS0] enabled
[    1.941882] mmc-bcm2835 3f300000.mmcnr: mmc_debug:0 mmc_debug2:0
[    1.950415] mmc-bcm2835 3f300000.mmcnr: DMA channel allocated
[    1.984869] sdhost: log_buf @ (ptrval) (fad07000)
[    2.029223] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
[    2.038760] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    2.046656] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1)
[    2.055777] of_cfs_init
[    2.060637] of_cfs_init: OK
[    2.066260] Waiting for root device PARTUUID=6c586e13-02...
[    2.074869] Indeed it is in host mode hprt0 = 00021501
[    2.143050] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    2.153768] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
[    2.162667] random: fast init done
[    2.291710] usb 1-1: new high-speed USB device number 2 using dwc_otg
[    2.300678] Indeed it is in host mode hprt0 = 00001101
[    2.375987] mmc1: new high speed SDIO card at address 0001
[    2.541984] usb 1-1: New USB device found, idVendor=0424, idProduct=9514, bcdDevice= 2.00
[    2.554746] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    2.564881] hub 1-1:1.0: USB hub found
[    2.571045] hub 1-1:1.0: 5 ports detected
[    2.891700] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[    3.021937] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00, bcdDevice= 2.00
[    3.035038] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    3.047594] smsc95xx v1.0.6
[    3.145063] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:26:80:2f
[    3.261699] usb 1-1.3: new high-speed USB device number 4 using dwc_otg
[    3.403320] usb 1-1.3: New USB device found, idVendor=090c, idProduct=1000, bcdDevice=11.00
[    3.417380] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    3.427855] usb 1-1.3: Product: Flash Disk
[    3.435009] usb 1-1.3: Manufacturer: USB
[    3.442510] usb-storage 1-1.3:1.0: USB Mass Storage device detected
[    3.452463] scsi host0: usb-storage 1-1.3:1.0
[    4.872072] scsi 0:0:0:0: Direct-Access     USB      Flash Disk       1100 PQ: 0 ANSI: 4
[    4.887877] sd 0:0:0:0: [sda] 62914560 512-byte logical blocks: (32.2 GB/30.0 GiB)
[    4.902341] sd 0:0:0:0: [sda] Write Protect is off
[    4.911187] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[    4.934074]  sda: sda1 sda2
[    4.944407] sd 0:0:0:0: [sda] Attached SCSI removable disk
[    4.966968] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null)
[    4.980491] VFS: Mounted root (ext4 filesystem) readonly on device 8:2.
[    4.999819] devtmpfs: mounted
[    5.011010] Freeing unused kernel memory: 1024K
[    5.018803] Run /sbin/init as init process
[    5.640200] systemd[1]: System time before build time, advancing clock.
[    5.786072] NET: Registered protocol family 10
[    5.794768] Segment Routing with IPv6
[    5.847335] 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)
[    5.878751] systemd[1]: Detected architecture arm.
[    5.905605] systemd[1]: Set hostname to <raspberrypi>.
[    5.938974] random: systemd: uninitialized urandom read (16 bytes read)
[    5.948562] systemd[1]: Initializing machine ID from random generator.
[    5.958254] systemd[1]: Installed transient /etc/machine-id file.
[    5.968771] systemd[1]: Failed to bump fs.file-max, ignoring: Invalid argument
[    6.333192] systemd[1]: File /lib/systemd/system/systemd-journald.service:12 configures an IP firewall (IPAddressDeny=any), but the local system does not support BPF/cgroup based firewalling.
[    6.358882] systemd[1]: Proceeding WITHOUT firewalling in effect! (This warning is only shown for the first loaded unit using IP firewalling.)
[    6.861179] random: systemd: uninitialized urandom read (16 bytes read)
[    6.908916] systemd[1]: Condition check resulted in Journal Audit Socket being skipped.
[    6.923314] random: systemd: uninitialized urandom read (16 bytes read)
[    6.933608] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[    6.951039] random: systemd: uninitialized urandom read (16 bytes read)
[    6.964954] random: systemd: uninitialized urandom read (16 bytes read)
[    6.979397] random: systemd: uninitialized urandom read (16 bytes read)
[   11.031853] Under-voltage detected! (0x00050005)

Raspbian GNU/Linux 10 raspberrypi ttyS0

raspberrypi login: