在LPC3250上使用UBIFS文件系统

Scanning device for bad blocks

Bad eraseblock 0 at 0x00000000

Bad eraseblock 1 at 0x00020000

Bad eraseblock 2 at 0x00040000

Bad eraseblock 152 at 0x01300000

Bad eraseblock 571 at 0x04760000

Bad eraseblock 1594 at 0x0c740000

Creating 5 MTD partitions on 'lpc32xx_nand':

0x00000000-0x00180000 : 'smartarm3250-boot'

0x00180000-0x001c0000 : 'smartarm3250-ubt-prms'

0x00200000-0x00600000 : 'smartarm3250-kernel'

0x00600000-0x01600000 : 'smartarm3250-safefs'

0x01600000-0x10000000 : 'smartarm3250-rootfs'

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:            'smartarm3250-rootfs'

UBI: MTD device size:            234 MiB

UBI: number of good PEBs:        1870

UBI: number of bad PEBs:         2

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: 1870

UBI: number of PEBs reserved for bad PEB handling: 18

UBI: max/mean erase counter: 2/1

UBI: background thread 'ubi_bgt0d' started, PID 262

at25 spi0.0: 32 KByte at25256a eeprom, pagesize 64

mice: PS/2 mouse device common for all mice

input: LPC32xx Touchscreen as /class/input/input0

rtc-lpc32xx rtc-lpc32xx: rtc core: registered rtc-lpc32xx as rtc0

i2c /dev entries driver

PNX4008-WDT: PNX4008 Watchdog Timer: heartbeat 19 sec

mmci-pl18x: DMA buffer(10000 bytes), P:0x839e0000, V:0xffc1a000

mmc0: MMCI rev 0 cfg 00 at 0x0000000020098000 irq 15,13

Advanced Linux Sound Architecture Driver Version 1.0.17.

ASoC version 0.13.2

UDA1380 Audio Codec 0.6<3>i2c-adapter i2c-4: Master timed out. stat = 0000, cntrl = 0000. Resetting master...

ALSA device list:

  No soundcards found.

TCP cubic registered

NET: Registered protocol family 17

RPC: Registered udp transport module.

RPC: Registered tcp transport module.

ieee80211: 802.11 data/management/control stack, git-1.1.13

ieee80211: Copyright (C) 2004-2005 Intel Corporation linux.intel.com>

VFP support v0.3: implementor 41 architecture 1 part 10 variant 9 rev 1

rtc-lpc32xx rtc-lpc32xx: setting system clock to 2033-04-20 18:46:57 UTC (1997635617)

UBIFS: mounted UBI device 0, volume 0, name 'rootfs'

UBIFS: file system size: 237017088 bytes (231462 KiB, 226 MiB, 1837 LEBs)

UBIFS: journal size: 11870208 bytes (11592 KiB, 11 MiB, 92 LEBs)

UBIFS: default compressor: LZO

UBIFS: media format 4, latest format 4

VFS: Mounted root (ubifs filesystem).

Freeing init memory: 112K

UBIFS: background thread 'ubifs_bgt0_0' started, PID 304

init started: BusyBox v1.11.2 ()

starting pid 306, tty '': '/etc/rc.d/rcS'

Mounting /proc and /sys

Starting the hotplug events dispatcher udevd

Synthesizing initial hotplug events

Setting the hostname to zlg

Mounting filesystems

mount: mounting usbfs on /proc/bus/usb failed: No such file or directory

Running sysctl

Setting up networking on loopback device:

Setting up networking on eth0:

Adding static route for default gateway to 192.168.7.1:

Setting nameserver to 192.168.7.1 in /etc/resolv.conf:

Starting inetd:

Starting the port mapper:

Starting the ssh server:

starting pid 605, tty '': '-/bin/sh'

[root@zlg /]#

[root@zlg /]# ls

bin      etc      linuxrc  proc     sys      usr

boot     home     mnt      root     tmp      var

dev      lib      opt      sbin     ubifs

[root@zlg /]# df

Filesystem           1k-blocks      Used Available Use% Mounted on

rootfs                  217224     68612    143552  32% /

ubi0:rootfs             217224     68612    143552  32% /

tmpfs                    30636        24     30612   0% /dev

shm                      30636         0     30636   0% /dev/shm

rwfs                       512         0       512   0% /mnt/rwfs

与YAFFS2测试对比：

  从NAND FLASH中读取和复制一个文件，同样大小，分别使用YAFFS2和UBIFS系统的对比情况：

[root@nxp mp3]# ls -la bh_48128.mp3

-rw-r--r--    1 user     user      5689344 Feb 29  2008 bh_48128.mp3

  文件大小差不多是5M多。

  yaffs2的系统，测试时间是9秒钟：

[root@nxp mp3]# time cp bh_48128.mp3 bh_48128-2.mp3

real    0m 9.28s

user    0m 0.01s

sys     0m 9.26s

  ubifs系统，测试时间差不多4秒多一点。

[root@zlg mp3]# time cp bh_48128.mp3 bh_48128-2.mp3

real   0m4.130s

user    0m0.000s

sys     0m2.810s

从这里就可以看出UBIFS速度远比YAFFS2快。

另外，UBIFS还采用了压缩，在PC上大约110MB的rootfs，固化到UBIFS分区后大约60多MB。

UBI和UBIFS的参考链接：

http://www.linux-mtd.infradead.org/doc/ubi.html

http://www.linux-mtd.infradead.org/doc/ubifs.html