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- UID
- 1029342
- 性别
- 男
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4、利用uboot烧写、启动UBIFS镜像
1）烧写UBIFS镜像
OMAP3 DevKit8000 # mmcinit
OMAP3 DevKit8000 # fatload mmc 0:1 81000000 ubi.img
reading ubi.img
12845056 bytes read
OMAP3 DevKit8000 # nand unlock
device 0 whole chip
nand_unlock: start: 00000000, length: 268435456!
NAND flash successfully unlocked
OMAP3 DevKit8000 # nand ecc sw
OMAP3 DevKit8000 # nand erase 680000 7980000
NAND erase: device 0 offset 0x680000, size 0x7980000
Erasing at 0x7fe0000 -- 100% complete.
OK
OMAP3 DevKit8000 # nand write.i 81000000 680000 $(filesize)
NAND write: device 0 offset 0x680000, size 0xc40000
Writing data at 0x12bf800 -- 100% complete.
12845056 bytes written: OK
烧写过程和烧写内核镜像的过程一致，所以UBI文件系统应该不像yaffs文件系统那样用到了nand的OOB区域。
2）设置UBIFS文件系统作为根文件系统启动的参数
OMAP3 DevKit8000 # setenv bootargs console=ttyS2,115200n8 ubi.mtd=4 root=ubi0:rootfs
rootfstype=ubifs video=omapfb:mode:4.3inch_LCD
OMAP3 DevKit8000 # setenv bootcmd nand read.i 80300000 280000 200000/;bootm 80300000
根文件系统的位置在MTD4上
系统启动时会打印出如下和UBI相关的信息：
Creating 5 MTD partitions on "omap2-nand":
0x00000000-0x00080000 : "X-Loader"
0x00080000-0x00260000 : "U-Boot"
0x00260000-0x00280000 : "U-Boot Env"
0x00280000-0x00680000 : "Kernel"
0x00680000-0x08000000 : "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: 121 MiB
UBI: number of good PEBs: 970
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: 970
UBI: number of PEBs reserved for bad PEB handling: 9
UBI: max/mean erase counter: 2/0 |
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