嵌入式linux系统地启动过程

MMC: NXP DWMMC: 0, NXP DWMMC: 1, NXP DWMMC: 2

In: serial

Out: serial

Err: serial

## DCDC_MODE(0x80): DCDC1[PFM], DCDC2[PFM], DCDC3[PFM], DCDC4[PWM], DCDC5[PWM]

## STATUS(0x00) : 0xe4 0x10

## IRQ(0x48) : 0x00 0x00 0x00 0x00 0x00

## CHG_TYPE : ADP

## BAT_VOL : 0mV

## BAT_CAP : 100%

DONE: Logo bmp 300 by 300 (3bpp), len=270056

DRAW: 0x47000000 -> 0x46000000

DONE: Logo bmp 300 by 300 (3bpp), len=270056

DRAW: 0x47000000 -> 0x46000000

RGB: display.0

MIPI: display.0

DSIM_ESCMODE 1 : 0xc0

DSIM_STATUS : 0x10010f

MIPI clk: 420MHz

DSIM_ESCMODE 2 : 0x0

DSIM_STATUS : 0x10010f

## Skip BAT Animation.

## IRQ(0x48) : 0x00 0x00 0x00 0x00 0x00

## chg_type : ADP

#saveenv

三、分析linux核

1.linux的作用

（1）进程管理和进程通信：进程的创建和删除，进程的优先级抢占，进程的时间片轮转，进程间的通信机制

（2）存管理：存分配算法，每个进程的存空间

（3）核支持的文件系统：#cat /proc/filesystems

（4）设备管理：------>linux驱动---->字符设备，块设备，网络设备，中断，核时钟（5）网络协议：如tcp/ip协议

[ 0.000000] vmalloc : 0xef800000 - 0xfee00000 ( 246 MB)

[ 0.000000] lowmem : 0xc0000000 - 0xef600000 ( 758 MB) [ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB) [ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)

[ 0.000000] .text : 0xc0008000 - 0xc0a54188 (10545 kB)

[ 0.000000] .init : 0xc0a55000 - 0xc0a92100 ( 245 kB)

[ 0.000000] .data : 0xc0a94000 - 0xc0b2e488 ( 618 kB)

[ 0.000000] .bss : 0xc0b2e4ac - 0xc0d0e1c8 (1920 kB)

[ 0.000000] SLUB: Genslabs=11, HWalign=64, Order=0-3, MinObjects=0, CPUs=8, Nodes=1

（4）设备管理

[ 0.207000] usbcore: registered new interface driver usbfs

[ 0.208000] i2c-gpio i2c-gpio.0: using pins 99 (SDA) and 98 (SCL)

[ 0.209000] s3c-i2c s3c2440-i2c.1: i2c-1: S3C I2C adapter

[ 0.210000] s3c-i2c s3c2440-i2c.1: slave address 0x10

[ 0.210000] s3c-i2c s3c2440-i2c.1: bus frequency set to 195 KHz

[ 0.211000] s3c-i2c s3c2440-i2c.2: i2c-2: S3C I2C adapter

[ 0.211000] s3c-i2c s3c2440-i2c.2: slave address 0x10

[ 0.211000] s3c-i2c s3c2440-i2c.2: bus frequency set to 195 KHz

[ 0.212000] Linux video capture interface: v2.00

[ 0.223000] axp22_ldo1: 3000 mV

[ 0.353000] Display LCD register operation

[ 0.354000] Display LVDS register operation

[ 0.354000] Display MiPi register operation

（5）网络协议

[ 0.331000] NET: Registered protocol family 2

[ 0.331000] IP route cache hash table entries: 32768 (order: 5, 131072 bytes)

[ 0.332000] TCP established hash table entries: 131072 (order: 8, 1048576 bytes)

[ 0.334000] TCP bind hash table entries: 65536 (order: 8, 1572864 bytes)

[ 0.336000] TCP: Hash tables configured (established 131072 bind 65536)

[ 0.336000] TCP: reno registered

[ 0.336000] UDP hash table entries: 512 (order: 3, 32768 bytes)

[ 0.337000] UDP-Lite hash table entries: 512 (order: 3, 32768 bytes)

[ 0.337000] NET: Registered protocol family 1

（6）挂载rootfs

[ 3.959000] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)

[ 3.961000] VFS: Mounted root (ext4 filesystem) on device 179:2.

[ 3.968000] devtmpfs: mounted

[ 3.970000] Freeing init memory: 244K