树莓派系统启动信息解略
解释启动信息
made by Rk
本文由浙江大学《嵌入式系统》课程提供强力支持。
感谢翁恺老师 @翁恺BA5AG
文中还有很多疏漏之处，故求高手们多多指导O_O/**************************************/
Welcome to minicom 2.6.1
OPTIONS: I18n
Compiled on Nov 20 2012, 04:38:29.
Port /dev/tty.usbserial
Press CTRL-A Z for help on special keys
Uncompressing Linux... done, booting the kernel. //解压linux核心,加载系统核心
[ 0.000000] Initializing cgroup subsys cpu //在加载CPU指令集后初始化CPU
[ 0.000000] Linux version 3.2.27+ (dc4@dc4-arm-01) (gcc version 4.7.2 2012072
[ 0.000000] CPU: ARMv6-compatible processor [410fb767] revision 7 (ARMv7), cd
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing instrue
[ 0.000000] Machine: BCM2708 //打印系统信息 其中CPU是ARM BCM 2708
[ 0.000000] Memory policy: ECC disabled, Data cache writeback //关闭ECC,使用缓存写回的内存管理方法.
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pa2
[ 0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 t
[ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes) //pid哈希表的条目数与入口
[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes) //目录dentry的哈希表条目入口
[ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes) //文件iNode哈希表条目数与入口
[ 0.000000] Memory: 448MB = 448MB total //总内存大小
[ 0.000000] Memory: 448872k/448872k available, 9880k reserved, 0K highmem //空闲内存448872K, 9880K为保存内存空间
[ 0.000000] Virtual kernel memory layout: //虚拟存储中系统核心的地址一览(以下为范围地址)
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB) //vector地址空间
[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB) //fixmap地址空间
[ 0.000000] vmalloc : 0xdc800000 - 0xe8000000 ( 184 MB)
//虚拟连续内存空间
[ 0.000000] lowmem : 0xc0000000 - 0xdc000000 ( 448 MB) //低内存区域空间
[ 0.000000] modules : 0xbf000000 - 0xc0000000 ( 16 MB) //系统模块区域空间
[ 0.000000] .text : 0xc0008000 - 0xc04c0e78 (4836 kB)
[ 0.000000] .init : 0xc04c1000 - 0xc04e0b10 ( 127 kB)
[ 0.000000] .data : 0xc04e2000 - 0xc050e1c0 ( 177 kB)
[ 0.000000] .bss : 0xc050e1e4 - 0xc05b5128 ( 668 kB)
[ 0.000000] NR_IRQS:330 //nr终端请求号
[ 0.000000] sched_clock: 32 bits at 1000kHz, resolution 1000ns, wraps every s //系统时钟的基本信息,
[ 0.000000] timer_set_mode: unhandled mode:1
[ 0.000000] timer_set_mode: unhandled mode:3
[ 0.000000] Console: colour dummy device 80x30 //虚拟设备信息
[ 0.000000] console [tty1] enabled //虚拟tty打开
[ 0.000948] Calibrating delay loop... 697.95 BogoMIPS (lpj=3489792) //统计CPU计算性能
[ 0.060148] pid_max: default: 32768 minimum: 301 //pid的默认值(最大与最小)
[ 0.060626] Mount-cache hash table entries: 512 //挂载缓存入口
[ 0.061116] Initializing cgroup subsys cpuacct //初始化CPU资源报告
[ 0.061209] Initializing cgroup subsys devices //初始化系统设备
[ 0.061244] Initializing cgroup subsys freezer //初始化中断的任务
[ 0.061274] Initializing cgroup subsys blkio //初始化输入输出设备
[ 0.061418] CPU: Testing write buffer coherency: ok //测试CPU写缓存通过
[ 0.061757] hw perfevents: enabled with v6 PMU driver, 3 counters available //系统性能优化工具已打开,采用v6 PMU驱动
[ 0.062963] devtmpfs: initialized //设备临时文件系统初始化完成
[ 0.073351] NET: Registered protocol family 16 //网络协议注册成功
[ 0.074035] bcm2708.uart_clock = 0 //初始化CPU异步时钟为0
[ 0.075659] hw-breakpoint: found 6 breakpoint and 1 watchpoint registers. //找到六个断点一个监视点
[ 0.075717] hw-breakpoint: maximum watchpoint size is 4 bytes. //监视点可监视最大内存大小为4bytes
[ 0.075755] mailbox: Broadcom VideoCore Mailbox driver //Broadcom公司的GPU驱动
[ 0.075860] bcm2708_vcio: mailbox at f200b880 //驱动地址
[ 0.075967] bcm_power: Broadcom power driver //博通的电源驱动
[ 0.076006] bcm_power_open() -> 0
[ 0.076032] bcm_power_request(0, 8)
[ 0.576712] bcm_mailbox_read -> 00000080, 0
[ 0.576751] bcm_power_request -> 0
[ 0.576776] Serial: AMBA PL011 UART driver //串口驱动初始化
[ 0.576932] dev:f1: ttyAMA0 at MMIO 0x20201000 (irq = 83) is a PL011 rev3
[ 0.886867] console [ttyAMA0] enabled //打开虚拟tty咨询台
[ 0.912370] bio: create slab at 0 //基本IO采用SLAB分配机制
[ 0.917579] SCSI subsystem initialized //SCSI子系统初始化完成
[ 0.921578] usbcore: registered new interface driver usbfs //载入USB文件系统
[ 0.927305] usbcore: registered new interface driver hub //载入hub驱动
[ 0.932888] usbcore: registered new device driver usb //载入USB驱动
[ 0.938922] Switching to clocksource stc
[ 0.943169] FS-Cache: Loaded //载入文件系统缓存
[ 0.946348] CacheFiles: Loaded //缓存文件载入成功
[ 0.963096] NET: Registered protocol family 2 //网络协议注册
[ 0.967930] IP route cache hash table entries: 4096 (order: 2, 16384 bytes) //IP路由缓存入口设定
[ 0.976118] TCP established hash table entries: 16384 (order: 5, 131072 byte)//TCP缓存入口设定
[ 0.984150] TCP bind hash table entries: 16384 (order: 4, 65536 bytes) //TCP绑定缓存入口设定
[ 0.991104] TCP: Hash tables configured (established 16384 bind 16384) //TCP协议配置完成
[ 0.997715] TCP reno registered //TCP协议注册完成
[ 1.000888] UDP hash table entries: 256 (order: 0, 4096 bytes) //UDP缓存入口设定
[ 1.006805] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes) //轻量级用户数据包(UDP-Lite)缓存入口设定
[ 1.013624] NET: Registered protocol family 1 //网络协议注册
[ 1.018754] RPC: Registered named UNIX socket transport module. //Unix socket 传输模块注册
[ 1.024888] RPC: Registered udp transport module. //RPC udp传输模块注册
[ 1.029613] RPC: Registered tcp transport module. //tcp传输模块注册
[ 1.034362] RPC: Registered tcp NFSv4.1 backchannel transport module. //网络文件系统传输模块注册
[ 1.041109] bcm2708_dma: DMA manager at dc808000 //DMA管理器地址
[ 1.045911] bcm2708_gpio: bcm2708_gpio_probe c04e9c18 //GPIO模块地址
[ 1.051371] vc-mem: phys_addr:0x00000000 mem_base=0x1c000000 mem_size:0x2000) //物理内存信息
[ 1.060657] audit: initializing netlink socket (disabled) //初始化网络连接套接字
[ 1.066206] type=2000 audit(0.750:1): initialized
[ 1.182280] VFS: Disk quotas dquot_6.5.2
[ 1.186526] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) //Dquot缓存入口设定
[ 1.194061] FS-Cache: Netfs 'nfs' registered for caching //网络文件系统缓存注册
[ 1.200324] msgmni has been set to 876 //消息队列上限设定
[ 1.206185] io scheduler noop registered //IO调度器注册
[ 1.210154] io scheduler deadline registered (default) //IO调度器请求过期设定
[ 1.215595] io scheduler cfq registered //IO调度器采用公平调度算法
[ 1.241311] Console: switching to colour frame buffer device 82x26
[ 1.253699] kgdb: Registered I/O driver kgdboc. //KGDB环境配置
[ 1.270072] brd: module loaded //载入brd模块
[ 1.280417] loop: module loaded //载入环回设备模块
[ 1.286588] vcos: [1]: vchiq_init_state: slot_zero = 0xffd80000, is_master =0
[ 1.296334] vcos: [1]: vchiq_init_state: called
[ 1.304030] vcos: [1]: vchiq: initialised - version 2 (min 2), device 252.0
[ 1.314043] usbcore: registered new interface driver smsc95xx //USB内核接口驱动注册完成
[ 1.322061] cdc_ncm: 04-Aug-2011 //CDC协议信息
[ 1.327691] usbcore: registered new interface driver cdc_ncm //加载USB核心CDC模块
[ 1.335641] dwc_otg: version 3.00a 10-AUG-2012 (platform bus) //OTG版本信息
[ 1.548781] Core Release: 2.80a
[ 1.554209] Setting default values for core params //设定内核参数为默认值
[ 1.561146] Finished setting default values for core params
[ 1.774054] Using Buffer DMA mode //使用DMA缓冲模式
[ 1.779471] Periodic Transfer Interrupt Enhancement - disabled //关闭传输中断
[ 1.787462] Multiprocessor Interrupt Enhancement - disabled //关闭多处理器中断
[ 1.795189] OTG VER PARAM: 0, OTG VER FLAG: 0
[ 1.801685] Dedicated Tx FIFOs mode
[ 1.807618] dwc_otg bcm2708_usb: DWC OTG Controller //USB接口使用DWC_OTG模式
[ 1.814923] dwc_otg bcm2708_usb: new USB bus registered, assigned bus number1 //注册OTG端口,设定标号为1
[ 1.824478] dwc_otg bcm2708_usb: irq 32, io mem 0x00000000
[ 1.832170] Init: Port Power? op_state=1 //初始化电源
[ 1.838280] Init: Power Port (0)
[ 1.843800] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.852775] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber1 //识别新USB设备
[ 1.862214] usb usb1: Product: DWC OTG Controller
[ 1.869150] usb usb1: Manufacturer: Linux 3.2.27+ dwc_otg_hcd
[ 1.877086] usb usb1: SerialNumber: bcm2708_usb
[ 1.884665] hub 1-0:1.0: USB hub found //找到USB扩展坞
[ 1.890553] hub 1-0:1.0: 1 port detected //检测到一个接入
[ 1.897686] usbcore: registered new interface driver uas 注册USB接口驱动
[ 1.905183] Initializing USB Mass Storage driver... //初始化USB大容量缓存驱动
[ 1.912342] usbcore: registered new interface driver usb-storage //注册USB存储接口驱动
[ 1.920510] USB Mass Storage support registered.
[ 1.927480] usbcore: registered new interface driver libusual
[ 1.935773] mousedev: PS/2 mouse device common for all mice //PS2鼠标设备适用于所有鼠标
[ 1.944362] bcm2835-cpufreq: min=700000 max=700000 cur=700000 //设定CPU内核变频机制
[ 1.950217] bcm2835-cpufreq: switching to governor powersave //切换到省电模式
[ 1.958030] bcm2835-cpufreq: switching to governor powersave
[ 1.965902] cpuidle: using governor ladder
[ 1.974065] cpuidle: using governor menu
[ 1.979999] sdhci: Secure Digital Host Controller Interface driver //SDHC接口驱动
[ 1.988194] sdhci: Copyright(c) Pierre Ossman //版权信息
[ 1.994799] sdhci: Enable low-latency mode //SDHC采用低延迟方式
[ 2.000860] bcm_power_open() -> 1
[ 2.007867] mmc0: SDHCI controller on BCM2708_Arasan [platform] using platfoA
[ 2.019768] mmc0: BCM2708 SDHC host at 0x20300000 DMA 2 IRQ 77 //SDHC接口采用DMA通道2,77中断
[ 2.027836] sdhci-pltfm: SDHCI platform and OF driver helper //SDHC平台
[ 2.037434] usbcore: registered new interface driver usbhid
[ 2.045210] usbhid: USB HID core driver
[ 2.052358] TCP cubic registered
[ 2.057841] Initializing XFRM netlink socket //初始化XFRM网络套接字
[ 2.112109] registered taskstats version 1 //注册任务状态
[ 2.133108] drivers/rtc/hctosys.c: unable to open rtc device (rtc0) //无法打开rtc设备
[ 2.153537] Waiting for root device /dev/mmcblk0p2... //等待根设备
[ 2.166913] mmc0: problem reading SD Status register.
[ 2.190425] mmc0: new high speed SDHC card at address b368
[ 2.213668] mmcblk0: mmc0:b368 SDC 7.51 GiB //读到新SD卡设备
[ 2.222116] mmcblk0: p1 p2
[ 2.311451] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. )//从根设备加载EXT4文件系统
[ 2.324224] VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 2.341452] devtmpfs: mounted //设备临时文件系统挂在完成
[ 2.346911] usb 1-1: new high-speed USB device number 2 using dwc_otg //新高速USB设备
[ 2.356767] Freeing init memory: 124K
[ 2.363161] Indeed it is in host mode hprt0 = 00001101
[ 2.573431] usb 1-1: New USB device found, idVendor=0424, idProduct=9512
[ 2.582583] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2.594508] hub 1-1:1.0: USB hub found
[ 2.601197] hub 1-1:1.0: 3 ports detected
[ 2.883256] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[ 2.993764] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
[ 3.005301] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumbe0
//以上均为扫描到新USB设备
[ 3.019404] smsc95xx v1.0.4
[ 3.088425] smsc95xx 1-1.1:1.0: eth0: register 'smsc95xx' at usb-bcm2708_usb3
[ 3.707686] udevd[137]: starting version 175
[ 9.274748] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null) //重新挂载EXT4根文件系统
[ 9.683250] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 10.404223] bcm2835 ALSA card created! //bcm2835音频卡
[ 10.410508] bcm2835 ALSA chip created!
[ 10.430337] bcm2835 ALSA chip created!
[ 10.440482] bcm2835 ALSA chip created!
[ 10.448576] bcm2835 ALSA chip created!
[ 10.456597] bcm2835 ALSA chip created!
[ 10.464425] bcm2835 ALSA chip created!
[ 10.472112] bcm2835 ALSA chip created! //音频芯片加载完成
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Debian GNU/Linux wheezy/sid raspberrypi ttyAMA0
raspberrypi login: