RPi 2B UART作为调试口或者普通串口-阿里云开发者社区

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RPi 2B UART作为调试口或者普通串口

简介: /************************************************************************************** * RPi 2B UART作为调试口或者普通串口 * 声明: * 本文主要记录RPi 2B UART如何设置为调试口或者普通串口,本来早就做出来了,由于接错 * 了线,GND和TXD接反了,导致SecureCRT发不出信号,但能接收到。
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/**************************************************************************************
 *                      RPi 2B UART作为调试口或者普通串口
 * 声明:
 *     本文主要记录RPi 2B UART如何设置为调试口或者普通串口,本来早就做出来了,由于接错
 * 了线,GND和TXD接反了,导致SecureCRT发不出信号,但能接收到。
 *
 *                                                   2016-2-24 深圳 南山平山村 曾剑锋
 ************************************************************************************/

一、参考文档:
    RPi Serial Connection
        http://elinux.org/RPi_Serial_Connection

二、uart serial:
    1. cat /boot/cmdline.txt
        dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
    2. cat /etc/inittab
        #Spawn a getty on Raspberry Pi serial line
        #T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100
    3. 串口获取的dmesg信息:
        lo[  655.631165] reboot: Restarting system
        Uncompressing Linux... done, booting the kernel.

三、debug console:
    1. cat /boot/cmdline.txt
        dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
    2. cat /etc/inittab
        #Spawn a getty on Raspberry Pi serial line
        T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100
    3. 串口获取的dmesg信息:
        Uncompressing Linux... done, booting the kernel.
        [    0.000000] Booting Linux on physical CPU 0xf00
        [    0.000000] Initializing cgroup subsys cpuset
        [    0.000000] Initializing cgroup subsys cpu
        [    0.000000] Initializing cgroup subsys cpuacct
        [    0.000000] Linux version 4.1.13-v7+ (dc4@dc4-XPS13-9333) (gcc version 4.8.3 20140303 (prerelease) (crosstool-NG linaro-1.13.1+bzr2650 - Linaro GCC 2014.03) ) #826 SMP PREEMPT Fri Nov 13 20:19:03 GMT 2015
        [    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
        [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
        [    0.000000] Machine model: Raspberry Pi 2 Model B Rev 1.1
        [    0.000000] cma: Reserved 8 MiB at 0x3a800000
        [    0.000000] Memory policy: Data cache writealloc
        [    0.000000] [bcm2709_smp_init_cpus] enter (9420->f3003010)
        [    0.000000] [bcm2709_smp_init_cpus] ncores=4
        [    0.000000] PERCPU: Embedded 13 pages/cpu @b9f64000 s20608 r8192 d24448 u53248
        [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 239540
        [    0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2709.boardrev=0xa21041 bcm2709.serial=0xc33be36b smsc95xx.macaddr=B8:27:EB:3B:E3:6B bcm2708_fb.fbswap=1 bcm2709.disk_led_gpio=47 bcm2709.disk_led_active_low=0 sdhci-bcm2708.emmc_clock_freq=250000000 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000  dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
        [    0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
        [    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: 939496K/966656K available (5967K kernel code, 534K rwdata, 1652K rodata, 420K init, 757K bss, 18968K 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 - 0xff000000   (1080 MB)
        [    0.000000]     lowmem  : 0x80000000 - 0xbb000000   ( 944 MB)
        [    0.000000]     modules : 0x7f000000 - 0x80000000   (  16 MB)
        [    0.000000]       .text : 0x80008000 - 0x80778f64   (7620 kB)
        [    0.000000]       .init : 0x80779000 - 0x807e2000   ( 420 kB)
        [    0.000000]       .data : 0x807e2000 - 0x80867b6c   ( 535 kB)
        [    0.000000]        .bss : 0x8086a000 - 0x8092779c   ( 758 kB)
        [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
        [    0.000000] Preemptible hierarchical RCU implementation.
        [    0.000000]  Additional per-CPU info printed with stalls.
        [    0.000000] NR_IRQS:608
        [    0.000000] Architected cp15 timer(s) running at 19.20MHz (phys).
        [    0.000000] clocksource arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns
        [    0.000010] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
        [    0.000032] Switching to timer-based delay loop, resolution 52ns
        [    0.000322] Console: colour dummy device 80x30
        [    0.002090] console [tty1] enabled
        [    0.002156] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)
        [    0.002256] pid_max: default: 32768 minimum: 301
        [    0.002633] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
        [    0.002698] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
        [    0.004012] Initializing cgroup subsys blkio
        [    0.004090] Initializing cgroup subsys memory
        [    0.004160] Initializing cgroup subsys devices
        [    0.004221] Initializing cgroup subsys freezer
        [    0.004296] Initializing cgroup subsys net_cls
        [    0.004403] CPU: Testing write buffer coherency: ok
        [    0.004523] ftrace: allocating 20235 entries in 60 pages
        [    0.053972] CPU0: update cpu_capacity 1024
        [    0.054052] CPU0: thread -1, cpu 0, socket 15, mpidr 80000f00
        [    0.054098] [bcm2709_smp_prepare_cpus] enter
        [    0.054264] Setting up static identity map for 0x8240 - 0x8274
        [    0.113839] [bcm2709_boot_secondary] cpu:1 started (0) 18
        [    0.114275] [bcm2709_secondary_init] enter cpu:1
        [    0.114331] CPU1: update cpu_capacity 1024
        [    0.114340] CPU1: thread -1, cpu 1, socket 15, mpidr 80000f01
        [    0.133826] [bcm2709_boot_secondary] cpu:2 started (0) 17
        [    0.134183] [bcm2709_secondary_init] enter cpu:2
        [    0.134215] CPU2: update cpu_capacity 1024
        [    0.134224] CPU2: thread -1, cpu 2, socket 15, mpidr 80000f02
        [    0.153868] [bcm2709_boot_secondary] cpu:3 started (0) 18
        [    0.154124] [bcm2709_secondary_init] enter cpu:3
        [    0.154153] CPU3: update cpu_capacity 1024
        [    0.154161] CPU3: thread -1, cpu 3, socket 15, mpidr 80000f03
        [    0.154255] Brought up 4 CPUs
        [    0.154389] SMP: Total of 4 processors activated (153.60 BogoMIPS).
        [    0.154431] CPU: All CPU(s) started in HYP mode.
        [    0.154467] CPU: Virtualization extensions available.
        [    0.155468] devtmpfs: initialized
        [    0.179850] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
        [    0.180241] clocksource jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
        [    0.181380] pinctrl core: initialized pinctrl subsystem
        [    0.182218] NET: Registered protocol family 16
        [    0.188015] DMA: preallocated 4096 KiB pool for atomic coherent allocations
        [    0.189281] bcm2709.uart_clock = 3000000
        [    0.194111] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
        [    0.194182] hw-breakpoint: maximum watchpoint size is 8 bytes.
        [    0.194403] Serial: AMBA PL011 UART driver
        [    0.194618] 3f201000.uart: ttyAMA0 at MMIO 0x3f201000 (irq = 83, base_baud = 0) is a PL011 rev2
        [    0.701674] console [ttyAMA0] enabled
        [    0.705954] bcm2835-mbox 3f00b880.mailbox: mailbox enabled
        [    0.786324] bcm2708-dmaengine 3f007000.dma: DMA legacy API manager at f3007000, dmachans=0xf35
        [    0.795082] bcm2708-dmaengine 3f007000.dma: Initialized 7 DMA channels (+ 1 legacy)
        [    0.803498] bcm2708-dmaengine 3f007000.dma: Load BCM2835 DMA engine driver
        [    0.810427] bcm2708-dmaengine 3f007000.dma: dma_debug:0
        [    0.816395] SCSI subsystem initialized
        [    0.820412] usbcore: registered new interface driver usbfs
        [    0.826051] usbcore: registered new interface driver hub
        [    0.831537] usbcore: registered new device driver usb
        [    0.837319] raspberrypi-firmware soc:firmware: Attached to firmware from 2015-11-18 15:43
        [    0.872892] Switched to clocksource arch_sys_counter
        [    0.927061] FS-Cache: Loaded
        [    0.930345] CacheFiles: Loaded
        [    0.945109] NET: Registered protocol family 2
        [    0.950796] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
        [    0.958063] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
        [    0.964794] TCP: Hash tables configured (established 8192 bind 8192)
        [    0.971327] UDP hash table entries: 512 (order: 2, 16384 bytes)
        [    0.977365] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
        [    0.984201] NET: Registered protocol family 1
        [    0.989133] RPC: Registered named UNIX socket transport module.
        [    0.995125] RPC: Registered udp transport module.
        [    0.999848] RPC: Registered tcp transport module.
        [    1.004619] RPC: Registered tcp NFSv4.1 backchannel transport module.
        [    1.012286] hw perfevents: enabled with armv7_cortex_a7 PMU driver, 5 counters available
        [    1.021871] futex hash table entries: 1024 (order: 4, 65536 bytes)
        [    1.043896] VFS: Disk quotas dquot_6.6.0
        [    1.048228] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
        [    1.057888] FS-Cache: Netfs 'nfs' registered for caching
        [    1.064441] NFS: Registering the id_resolver key type
        [    1.069577] Key type id_resolver registered
        [    1.073817] Key type id_legacy registered
        [    1.080614] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
        [    1.088335] io scheduler noop registered
        [    1.092293] io scheduler deadline registered (default)
        [    1.097800] io scheduler cfq registered
        [    1.104251] BCM2708FB: allocated DMA memory fac00000
        [    1.109274] BCM2708FB: allocated DMA channel 0 @ f3007000
        [    1.120375] Console: switching to colour frame buffer device 82x26
        [    1.131852] Serial: 8250/16550 driver, 0 ports, IRQ sharing disabled
        [    1.140469] KGDB: Registered I/O driver kgdboc
        [    1.183661] vc-cma: Videocore CMA driver
        [    1.189264] vc-cma: vc_cma_base      = 0x00000000
        [    1.195623] vc-cma: vc_cma_size      = 0x00000000 (0 MiB)
        [    1.202580] vc-cma: vc_cma_initial   = 0x00000000 (0 MiB)
        [    1.209723] vc-mem: phys_addr:0x00000000 mem_base=0x3dc00000 mem_size:0x3f000000(1008 MiB)
        [    1.236745] brd: module loaded
        [    1.250281] loop: module loaded
        [    1.255997] vchiq: vchiq_init_state: slot_zero = 0xbac80000, is_master = 0
        [    1.266297] Loading iSCSI transport class v2.0-870.
        [    1.273751] usbcore: registered new interface driver smsc95xx
        [    1.281082] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
        [    1.488693] Core Release: 2.80a
        [    1.493335] Setting default values for core params
        [    1.499647] Finished setting default values for core params
        [    1.707160] Using Buffer DMA mode
        [    1.711972] Periodic Transfer Interrupt Enhancement - disabled
        [    1.719431] Multiprocessor Interrupt Enhancement - disabled
        [    1.726588] OTG VER PARAM: 0, OTG VER FLAG: 0
        [    1.732474] Dedicated Tx FIFOs mode
        [    1.737794] WARN::dwc_otg_hcd_init:1047: FIQ DMA bounce buffers: virt = 0xbac14000 dma = 0xfac14000 len=9024
        [    1.750833] FIQ FSM acceleration enabled for :
        [    1.750833] Non-periodic Split Transactions
        [    1.750833] Periodic Split Transactions
        [    1.750833] High-Speed Isochronous Endpoints
        [    1.774070] WARN::hcd_init_fiq:412: FIQ on core 1 at 0x80402c54
        [    1.781613] WARN::hcd_init_fiq:413: FIQ ASM at 0x80402fb0 length 36
        [    1.789513] WARN::hcd_init_fiq:438: MPHI regs_base at 0xbb89a000
        [    1.797136] dwc_otg 3f980000.usb: DWC OTG Controller
        [    1.803750] dwc_otg 3f980000.usb: new USB bus registered, assigned bus number 1
        [    1.812686] dwc_otg 3f980000.usb: irq 32, io mem 0x00000000
        [    1.819890] Init: Port Power? op_state=1
        [    1.825366] Init: Power Port (0)
        [    1.830390] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
        [    1.838788] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
        [    1.847606] usb usb1: Product: DWC OTG Controller
        [    1.853872] usb usb1: Manufacturer: Linux 4.1.13-v7+ dwc_otg_hcd
        [    1.861426] usb usb1: SerialNumber: 3f980000.usb
        [    1.868462] hub 1-0:1.0: USB hub found
        [    1.873871] hub 1-0:1.0: 1 port detected
        [    1.880153] usbcore: registered new interface driver usb-storage
        [    1.887946] mousedev: PS/2 mouse device common for all mice
        [    1.895869] bcm2835-cpufreq: min=600000 max=900000
        [    1.902495] sdhci: Secure Digital Host Controller Interface driver
        [    1.910227] sdhci: Copyright(c) Pierre Ossman
        [    1.916640] mmc-bcm2835 3f300000.mmc: mmc_debug:0 mmc_debug2:0
        [    1.924050] mmc-bcm2835 3f300000.mmc: DMA channels allocated
        [    1.963260] sdhci-pltfm: SDHCI platform and OF driver helper
        [    1.977560] ledtrig-cpu: registered to indicate activity on CPUs
        [    1.985434] hidraw: raw HID events driver (C) Jiri Kosina
        [    1.992691] usbcore: registered new interface driver usbhid
        [    2.000928] usbhid: USB HID core driver
        [    2.007827] Initializing XFRM netlink socket
        [    2.013792] NET: Registered protocol family 17
        [    2.023001] Key type dns_resolver registered
        [    2.029254] Registering SWP/SWPB emulation handler
        [    2.036451] registered taskstats version 1
        [    2.042269] vc-sm: Videocore shared memory driver
        [    2.048495] [vc_sm_connected_init]: start
        [    2.052577] mmc0: host does not support reading read-only switch, assuming write-enable
        [    2.056256] mmc0: new high speed SDHC card at address aaaa
        [    2.056866] mmcblk0: mmc0:aaaa SS08G 7.40 GiB 
        [    2.066398]  mmcblk0: p1 p2
        [    2.082648] Indeed it is in host mode hprt0 = 00021501
        [    2.083600] [vc_sm_connected_init]: end - returning 0
        [    2.109834] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
        [    2.121267] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
        [    2.130804] devtmpfs: mounted
        [    2.136162] Freeing unused kernel memory: 420K (80779000 - 807e2000)
        [    2.272989] usb 1-1: new high-speed USB device number 2 using dwc_otg
        [    2.281567] Indeed it is in host mode hprt0 = 00001101
        [    2.441901] random: systemd urandom read with 35 bits of entropy available
        [    2.456018] systemd[1]: systemd 215 running in system mode. (+PAM +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ -SECCOMP -APPARMOR)
        [    2.473913] systemd[1]: Detected architecture 'arm'.
        [    2.493434] usb 1-1: New USB device found, idVendor=0424, idProduct=9514
        [    2.502086] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
        [    2.512140] hub 1-1:1.0: USB hub found
        [    2.518056] hub 1-1:1.0: 5 ports detected
        [    2.617947] NET: Registered protocol family 10
        [    2.626739] systemd[1]: Inserted module 'ipv6'
        [    2.635313] systemd[1]: Set hostname to <raspberrypi>.
        [    2.725272] uart-pl011 3f201000.uart: no DMA platform data
        [    2.802987] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
        [    2.924064] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
        [    2.933304] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
        [    2.950115] smsc95xx v1.0.4
        [    3.017276] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:3b:e3:6b
        [    3.123001] usb 1-1.3: new high-speed USB device number 4 using dwc_otg
        [    3.137859] systemd[1]: Starting Forward Password Requests to Wall Directory Watch.
        [    3.149619] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
        [    3.160914] systemd[1]: Expecting device dev-ttyAMA0.device...
        [    3.171313] systemd[1]: Starting Remote File Systems (Pre).
        [    3.181189] systemd[1]: Reached target Remote File Systems (Pre).
        [    3.189375] systemd[1]: Starting Encrypted Volumes.
        [    3.198602] systemd[1]: Reached target Encrypted Volumes.
        [    3.206226] systemd[1]: Starting Arbitrary Executable File Formats File System Automount Point.
        [    3.222072] systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point.
        [    3.235832] systemd[1]: Starting Swap.
        [    3.244177] systemd[1]: Reached target Swap.
        [    3.250486] systemd[1]: Expecting device dev-mmcblk0p1.device...
        [    3.261239] systemd[1]: Starting Root Slice.
        [    3.269793] systemd[1]: Created slice Root Slice.
        [    3.276410] systemd[1]: Starting User and Session Slice.
        [    3.285991] systemd[1]: Created slice User and Session Slice.
        [    3.293635] systemd[1]: Starting /dev/initctl Compatibility Named Pipe.
        [    3.304744] systemd[1]: Listening on /dev/initctl Compatibility Named Pipe.
        [    3.313717] systemd[1]: Starting Delayed Shutdown Socket.
        [    3.323392] systemd[1]: Listening on Delayed Shutdown Socket.
        [    3.331017] systemd[1]: Starting Journal Socket (/dev/log).
        [    3.340717] systemd[1]: Listening on Journal Socket (/dev/log).
        [    3.348582] systemd[1]: Starting udev Control Socket.
        [    3.357670] systemd[1]: Listening on udev Control Socket.
        [    3.364937] systemd[1]: Starting udev Kernel Socket.
        [    3.373913] systemd[1]: Listening on udev Kernel Socket.
        [    3.381067] systemd[1]: Starting Journal Socket.
        [    3.389987] systemd[1]: Listening on Journal Socket.
        [    3.396974] systemd[1]: Starting System Slice.
        [    3.405556] systemd[1]: Created slice System Slice.
        [    3.412279] systemd[1]: Starting File System Check on Root Device...
        [    3.425817] systemd[1]: Starting system-systemd\x2dfsck.slice.
        [    3.436737] systemd[1]: Created slice system-systemd\x2dfsck.slice.
        [    3.444983] systemd[1]: Starting system-autologin.slice.
        [    3.455282] systemd[1]: Created slice system-autologin.slice.
        [    3.463207] systemd[1]: Starting system-serial\x2dgetty.slice.
        [    3.473706] systemd[1]: Created slice system-serial\x2dgetty.slice.
        [    3.482186] systemd[1]: Starting Increase datagram queue length...
        [    3.495995] systemd[1]: Starting Restore / save the current clock...
        [    3.544175] systemd[1]: Starting Load Kernel Modules...
        [    3.576265] systemd[1]: Started Set Up Additional Binary Formats.
        [    3.592664] systemd[1]: Starting Create list of required static device nodes for the current kernel...
        [    3.616267] systemd[1]: Mounting Debug File System...
        [    3.630391] systemd[1]: Mounting POSIX Message Queue File System...
        [    3.645149] systemd[1]: Mounted Huge Pages File System.
        [    3.653252] systemd[1]: Starting udev Coldplug all Devices...
        [    3.664271] usb 1-1.3: New USB device found, idVendor=148f, idProduct=7601
        [    3.664287] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
        [    3.675337] fuse init (API version 7.23)
        [    3.693816] systemd[1]: Starting Slices.
        [    3.703250] systemd[1]: Reached target Slices.
        [    3.711825] i2c /dev entries driver
        [    3.719708] systemd[1]: Mounted POSIX Message Queue File System.
        [    3.730629] systemd[1]: Mounted Debug File System.
        [    3.742275] systemd[1]: Started Increase datagram queue length.
        [    3.766497] systemd[1]: Started Restore / save the current clock.
        [    3.778666] systemd[1]: Started Load Kernel Modules.
        [    3.789610] systemd[1]: Started Create list of required static device nodes for the current kernel.
        [    3.808259] systemd[1]: Started File System Check on Root Device.
        [    3.843156] systemd[1]: Time has been changed
        [    3.902051] systemd[1]: Started udev Coldplug all Devices.
        [    4.050303] systemd[1]: Starting Create Static Device Nodes in /dev...
        [    4.065244] systemd[1]: Mounting FUSE Control File System...
        [    4.079358] systemd[1]: Starting Apply Kernel Variables...
        [    4.094942] systemd[1]: Mounting Configuration File System...
        [    4.108786] systemd[1]: Starting Syslog Socket.
        [    4.118425] systemd[1]: Listening on Syslog Socket.
        [    4.125514] systemd[1]: Starting Journal Service...
        
        Raspbian GNU/Linux 8 raspberrypi ttyAMA0
        
        raspberrypi login: pi
        Password: 
        Last login: Wed Feb 24 11:34:12 UTC 2016 on tty1
        Linux raspberrypi 4.1.13-v7+ #826 SMP PREEMPT Fri Nov 13 20:19:03 GMT 2015 armv7l
        
        The programs included with the Debian GNU/Linux system are free software;
        the exact distribution terms for each program are described in the
        individual files in /usr/share/doc/*/copyright.
        
        Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
        permitted by applicable law.
        pi@raspberrypi:~$ ls
        Desktop    Downloads  Pictures  Public        show       Videos
        Documents  Music      programe  python_games  Templates
        pi@raspberrypi:~$ 

 

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