大家好，请教大家linux时间优化的问题，本人用的是devkit8500D这块板子，加上QT以后大概启动时间要18S，看网上有人说不加QT可以优化到7s左右，有没有人能够帮忙分析一下，哪些地方可以优化，最好能够详细一点，以下是终端里面打印的信息：
Instruments X-Loader 1.47 (Mar 25 2011 - 10:15:15)
Devkit8500 xM Rev A
Booting from nand . . .
Starting OS Bootloader...
U-Boot 2010.06-rc1-svn (Jun 06 2012 - 09:22:53)
OMAP3630-GP ES2.1, CPU-OPP2 L3-165MHz
OMAP3 Devkit8500 board + LPDDR/NAND
I2C: ready
DRAM: 512 MiB
NAND: 512 MiB
In: serial
Out: serial
Err: serial
Devkit8500 xM Rev A
Die ID #47be00029e3800000168300e0f034012
Net: dm9000
Hit any key to stop autoboot: 0
No MMC card found
Booting from nand ...
NAND read: device 0 offset 0x280000, size 0x400000
4194304 bytes read: OK
## Booting kernel from Legacy Image at 81000000 ...
Image Name: Linux-2.6.32
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2127628 Bytes = 2 MiB
Load Address: 80008000
Entry Point: 80008000
Loading Kernel Image ... OK
OK
Starting kernel ...
Uncompressing Linux.............................................................
Linux version 2.6.32 (administrator@ubuntu) (gcc version 4.4.0 (GCC) ) #5 Mon A4
CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: OMAP3 DEVKIT8500 Board
Memory policy: ECC disabled, Data cache writeback
OMAP3630/DM3730 ES1.0 (l2cache iva sgx neon isp 192mhz_clk )
SRAM: Mapped pa 0x40200000 to va 0xfe400000 size: 0x100000
Reserving 12582912 bytes SDRAM for VRAM
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 130048
Kernel command line: console=ttyS2,115200n8 mpurate=1000 vram=12M omapdss.def_d2
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 256MB 256MB = 512MB total
Memory: 502912KB available (3780K code, 353K data, 164K init, 0K highmem)
Hierarchical RCU implementation.
NR_IRQS:402
Clocking rate (Crystal/Core/MPU): 26.0/332/600 MHz
Reprogramming SDRC clock to 332000000 Hz
GPMC revision 5.0
IRQ: Found an INTC at 0xfa200000 (revision 4.0) with 96 interrupts
Total of 96 interrupts on 1 active controller
OMAP GPIO hardware version 2.5
OMAP clockevent source: GPTIMER12 at 32768 Hz
Console: colour dummy device 80x30
Calibrating delay loop... 346.58 BogoMIPS (lpj=1351680)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
regulator: core version 0.5
NET: Registered protocol family 16
Found NAND on CS0
Registering NAND on CS0
Unable to get DVI PUP GPIO
Target VDD1 OPP = 4, VDD2 OPP = 2
OMAP DMA hardware revision 5.0
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
i2c_omap i2c_omap.1: bus 1 rev4.0 at 2600 kHz
twl4030: PIH (irq 7) chaining IRQs 368..375
twl4030: power (irq 373) chaining IRQs 376..383
twl4030: gpio (irq 368) chaining IRQs 384..401
regulator: VUSB1V5: 1500 mV normal standby
regulator: VUSB1V8: 1800 mV normal standby
regulator: VUSB3V1: 3100 mV normal standby
twl4030_usb twl4030_usb: Initialized TWL4030 USB module
regulator: VMMC1: 1850 <--> 3150 mV normal standby
regulator: VDAC: 1800 mV normal standby
regulator: VPLL2: 1800 mV normal standby
regulator: VMMC2: 1850 <--> 3150 mV normal standby
regulator: VSIM: 1800 <--> 3000 mV normal standby
i2c_omap i2c_omap.2: bus 2 rev4.0 at 400 kHz
i2c_omap i2c_omap.3: bus 3 rev4.0 at 100 kHz
Switching to clocksource 32k_counter
musb_hdrc: version 6.0, musb-dma, host, debug=0
musb_hdrc: USB Host mode controller at fa0ab000 using DMA, IRQ 92
musb_hdrc musb_hdrc: MUSB HDRC host driver
musb_hdrc musb_hdrc: new USB bus registered, assigned bus number 1
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
NET: Registered protocol family 2
IP route cache hash table entries: 4096 (order: 2, 16384 bytes)
TCP established hash table entries: 16384 (order: 5, 131072 bytes)
TCP bind hash table entries: 16384 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 16384 bind 16384)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
omap-iommu omap-iommu.0: isp registered
ashmem: initialized
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
msgmni has been set to 982
alg: No test for stdrng (krng)
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
OMAP DSS rev 2.0
OMAP DISPC rev 3.0
OMAP VENC rev 2
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
serial8250.0: ttyS0 at MMIO 0x4806a000 (irq = 72) is a ST16654
serial8250.1: ttyS1 at MMIO 0x4806c000 (irq = 73) is a ST16654
serial8250.2: ttyS2 at MMIO 0x49020000 (irq = 74) is a ST16654
console [ttyS2] enabled
brd: module loaded
loop: module loaded
omap2-nand driver initializing
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xbc (Micron NAND 512MiB 1,8V 16-b)
cmdlinepart partition parsing not available
Creating 5 MTD partitions on "omap2-nand":
0x000000000000-0x000000080000 : "X-Loader"
0x000000080000-0x000000260000 : "U-Boot"
0x000000260000-0x000000280000 : "U-Boot Env"
0x000000280000-0x000000680000 : "Kernel"
0x000000680000-0x000020000000 : "File System"
UBI: attaching mtd4 to ubi0
UBI: physical eraseblock size: 131072 bytes (128 KiB)
UBI: logical eraseblock size: 129024 bytes
UBI: smallest flash I/O unit: 2048
UBI: sub-page size: 512
UBI: VID header offset: 512 (aligned 512)
UBI: data offset: 2048
UBI: attached mtd4 to ubi0
UBI: MTD device name: "File System"
UBI: MTD device size: 505 MiB
UBI: number of good PEBs: 4044
UBI: number of bad PEBs: 0
UBI: max. allowed volumes: 128
UBI: wear-leveling threshold: 4096
UBI: number of internal volumes: 1
UBI: number of user volumes: 1
UBI: available PEBs: 0
UBI: total number of reserved PEBs: 4044
UBI: number of PEBs reserved for bad PEB handling: 40
UBI: max/mean erase counter: 2/1
UBI: image sequence number: 0
UBI: background thread "ubi_bgt0d" started, PID 432
PPP generic driver version 2.4.2
PPP Deflate Compression module registered
PPP BSD Compression module registered
NET: Registered protocol family 24
dm9000 Ethernet Driver, V1.31
eth0: dm9000a at e08b6000,e08ba400 IRQ 185 MAC: 00:11:22:33:44:55 (chip)
usbcore: registered new interface driver asix
usbcore: registered new interface driver cdc_ether
usbcore: registered new interface driver dm9601
usbcore: registered new interface driver smsc95xx
usbcore: registered new interface driver gl620a
usbcore: registered new interface driver net1080
usbcore: registered new interface driver cdc_subset
usbcore: registered new interface driver zaurus
usbcore: registered new interface driver MOSCHIP usb-ethernet driver
usbmon: debugfs is not available
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ehci-omap ehci-omap.0: OMAP-EHCI Host Controller
ehci-omap ehci-omap.0: new USB bus registered, assigned bus number 2
ehci-omap ehci-omap.0: irq 77, io mem 0x48064800
ehci-omap ehci-omap.0: USB 2.0 started, EHCI 1.00
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 3 ports detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usbcore: registered new interface driver usbserial
USB Serial support registered for generic
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial Driver core
udc: OMAP UDC driver, version: 4 October 2004 (iso) (dma)
input: gpio-keys as /devices/platform/gpio-keys/input/input0
input: TWL4030 Keypad as /devices/platform/i2c_omap.1/i2c-1/1-004a/twl4030_keyp1
ads7846 spi2.0: touchscreen, irq 187
input: ADS7846 Touchscreen as /devices/platform/omap2_mcspi.2/spi2.0/input/inpu2
twl_rtc twl_rtc: rtc core: registered twl_rtc as rtc0
twl_rtc twl_rtc: Power up reset detected.
twl_rtc twl_rtc: Enabling TWL-RTC.
i2c /dev entries driver
Linux video capture interface: v2.00
tvp514x 2-005d: Registered to v4l2 master omap34xxcam!!
omap-iommu omap-iommu.0: isp: version 1.1
usbcore: registered new interface driver uvcvideo
USB Video Class driver (v0.1.0)
Registered led device: sys_led
Registered led device: user_ledb
Registered led device: user_led1
Registered led device: user_led2
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
TCP cubic registered
NET: Registered protocol family 17
NET: Registered protocol family 15
Power Management for TI OMAP3.
Unable to set L3 frequency (400000000)
Switched to new clocking rate (Crystal/Core/MPU): 26.0/332/1000 MHz
IVA2 clocking rate: 800 MHz
SmartReflex driver initialized
usb 2-1: new high speed USB device using ehci-omap and address 2
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
Console: switching to colour frame buffer device 128x48
regulator_init_complete: incomplete constraints, leaving VDVI on
regulator_init_complete: incomplete constraints, leaving VDAC on
twl_rtc twl_rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)
tvp514x 2-005d: tvp5146m2 found at 0xba (OMAP I2C adapter)
omapdss DPI error: display already enabled
omap_vout omap_vout: 'lcd' Display already enabled
omapdss DPI error: display already enabled
omap_vout omap_vout: 'lcd' Display already enabled
omap_vout omap_vout: Buffer Size = 3686400
omap_vout omap_vout: : registered and initialized video device 1
omap_vout omap_vout: Buffer Size = 3686400
omap_vout omap_vout: : registered and initialized video device 2
UBIFS: recovery needed
UBIFS: recovery completed
UBIFS: mounted UBI device 0, volume 0, name "rootfs"
UBIFS: file system size: 256112640 bytes (250110 KiB, 244 MiB, 1985 LEBs)
UBIFS: journal size: 9033728 bytes (8822 KiB, 8 MiB, 71 LEBs)
UBIFS: media format: w4/r0 (latest is w4/r0)
UBIFS: default compressor: lzo
UBIFS: reserved for root: 0 bytes (0 KiB)
VFS: Mounted root (ubifs filesystem) on device 0:11.
Freeing init memory: 164K
Failed to execute /init. Attempting defaults...
hub 2-1:1.0: USB hub found
hub 2-1:1.0: 4 ports detected
INIT: version 2.86 booting
Starting udevusb 2-1.4: new low speed USB device using ehci-omap and address 3
input: HID 04f3:0103 as /devices/platform/ehci-omap.0/usb2/2-1/2-1.4/2-1.4:1.0/3
generic-usb 0003:04F3:0103.0001: input: USB HID v1.10 Keyboard [HID 04f3:0103] 0
input: HID 04f3:0103 as /devices/platform/ehci-omap.0/usb2/2-1/2-1.4/2-1.4:1.1/4
generic-usb 0003:04F3:0103.0002: input: USB HID v1.10 Device [HID 04f3:0103] on1
tar: removing leading '/' from member names
Remounting root file system...
UBIFS: parse relatime
UBIFS error (pid 1342): ubifs_parse_options: unrecognized mount option "relatime
UBIFS error (pid 1342): ubifs_remount_fs: invalid or unknown remount parameter
mount: mounting ubi0:rootfs on / failed: Invalid argument
UBIFS: parse relatime
UBIFS error (pid 1344): ubifs_parse_options: unrecognized mount option "relatime
UBIFS error (pid 1344): ubifs_remount_fs: invalid or unknown remount parameter
mount: mounting ubi0:rootfs on / failed: Invalid argument
root: mount: mounting rootfs on / failed: No such file or directory
root: mount: mounting usbfs on /proc/bus/usb failed: No such file or directory
Setting up IP spoofing protection: rp_filter.
Configuring network interfaces... done.
/sbin/ldconfig: /lib/libts-0.0.so.0 is not a symbolic link
Tue Jan 27 08:47:00 UTC 2009
INIT: Entering runlevel: 5
Starting syslogd/klogd: done
insmod: cannot insert '/devkit8500D/spi-can.ko': Function not implemented
ln: /devkit8500D/qtlib/libQtCore.so.4: File exists
ln: /devkit8500D/qtlib/libQtGui.so.4: File exists
ln: /devkit8500D/qtlib/libQtNetwork.so.4: File exists
ln: /devkit8500D/cpluslib/libstdc++.so.6: File exists
ir read : fopen erro!
ccd read : fopen erro!
虽然最后erro了，但是在显示器上还是能显示视频图像，怎么对启动时间进行优化，能分享一下您的经验吗？新手，最好能详细点，谢谢！
