ubi制作过程：
1
mkdir boot
cp uImage tci6614-evm.dtb boot/ /*把内核和设备树copy到这里*/
./mkfs.ubifs -r boot -F -o tci6614-boot.ubifs.img -m 2048 -e 126976 -c 41
2
制作rootfs的 ubi-img
mkdir rootfs /*把rootfs文件内容copy到这里*/
./mkfs.ubifs -r rootfs -F -o tci6614-rootfs.ubifs.img -m 2048 -e 126976 -c 214
3
编辑ubinize.cfg 内容，一共分为2个卷：boot和 rootfs
[boot]
mode=ubi
image=tci6614-boot.ubifs.img
vol_type=dynamic
vol_id=0
vol_name=boot
vol_size=10MiB
[rootfs]
mode=ubi
image=tci6614-rootfs.ubifs.img
vol_id=1
vol_type=dynamic
vol_name=rootfs
vol_flags=autoresize
./ubinize -o tci6614-evm-ubifs.ubi -m 2048 -p 128KiB -s 2048 -O 2048 ubinize.cfg
rootfs 卷 作为根目录挂载点
当nand 大小为128M时，内核启动相关打印如下：
Generic platform RAM MTD, (c) 2004 Simtec Electronics
ONFI flash detected
ONFI param page 0 valid
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xa1 (Micron MT29F1G08ABBDAHC)
Bad block table found at page 65472, version 0x02
Bad block table found at page 65408, version 0x02
nand_read_bbt: bad block at 0x0000003e0000
Creating 3 MTD partitions on "davinci_nand.0": ----------------- nand分了三个分区 u-boot, params, ubifs； ubifs又分为2个卷：[boot] 和[rootfs]
0x000000000000-0x000000100000 : "u-boot"
0x000000100000-0x000000180000 : "params"
0x000000180000-0x000008000000 : "ubifs"
davinci_nand davinci_nand.0: controller rev. 2.5
UBI: attaching mtd2 to ubi0
UBI: physical eraseblock size: 131072 bytes (128 KiB)
UBI: logical eraseblock size: 126976 bytes
UBI: smallest flash I/O unit: 2048
UBI: sub-page size: 512
UBI: VID header offset: 2048 (aligned 2048)
UBI: data offset: 4096
UBI: max. sequence number: 0
UBI: attached mtd2 to ubi0
UBI: MTD device name: "ubifs"
UBI: MTD device size: 126 MiB -----------------ubifs 分区 大小为126M
UBI: number of good PEBs: 1007
UBI: number of bad PEBs: 5
UBI: number of corrupted PEBs: 0
UBI: max. allowed volumes: 128
UBI: wear-leveling threshold: 4096
UBI: number of internal volumes: 1
UBI: number of user volumes: 2
UBI: available PEBs: 17
UBI: total number of reserved PEBs: 990
UBI: number of PEBs reserved for bad PEB handling: 10
UBI: max/mean erase counter: 1/0
UBI: image sequence number: 1842436994
UBI: background thread "ubi_bgt0d" started, PID 337
m25p80 spi0.0: n25q032 (4096 Kbytes)
Creating 2 MTD partitions on "m25p80":
0x000000000000-0x000000080000 : "u-boot-spl"
0x000000080000-0x000000400000 : "test"
....
UBIFS: parse sync
UBIFS: start fixing up free space
UBIFS: free space fixup complete
UBIFS: mounted UBI device 0, volume 1, name "rootfs" ----------------------- 其中rootfs 卷 大小为102M
UBIFS: file system size: 107421696 bytes (104904 KiB, 102 MiB, 846 LEBs)
UBIFS: journal size: 9023488 bytes (8812 KiB, 8 MiB, 72 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 0:13.
Freeing init memory: 168K
当nand 设备大小为256M时，内核启动相关打印如下：
Generic platform RAM MTD, (c) 2004 Simtec Electronics
ONFI flash detected
ONFI param page 0 valid
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xaa (Micron MT29F2G08ABD)
Bad block table found at page 131008, version 0x01
Bad block table found at page 130944, version 0x01
Creating 3 MTD partitions on "davinci_nand.0":
0x000000000000-0x000000100000 : "u-boot"
0x000000100000-0x000000180000 : "params"
0x000000180000-0x000010000000 : "ubifs"
davinci_nand davinci_nand.0: controller rev. 2.5
UBI: attaching mtd2 to ubi0
UBI: physical eraseblock size: 131072 bytes (128 KiB)
UBI: logical eraseblock size: 126976 bytes
UBI: smallest flash I/O unit: 2048
UBI: sub-page size: 512
UBI: VID header offset: 2048 (aligned 2048)
UBI: data offset: 4096
UBI: max. sequence number: 2
UBI: attached mtd2 to ubi0
UBI: MTD device name: "ubifs"
UBI: MTD device size: 254 MiB -----------------ubifs 分区 大小为254M
UBI: number of good PEBs: 2032
UBI: number of bad PEBs: 4
UBI: number of corrupted PEBs: 0
UBI: max. allowed volumes: 128
UBI: wear-leveling threshold: 4096
UBI: number of internal volumes: 1
UBI: number of user volumes: 2
UBI: available PEBs: 0
UBI: total number of reserved PEBs: 2032
UBI: number of PEBs reserved for bad PEB handling: 20
UBI: max/mean erase counter: 1/0
UBI: image sequence number: 933843460
UBI: background thread "ubi_bgt0d" started, PID 337
m25p80 spi0.0: n25q032 (4096 Kbytes)
Creating 2 MTD partitions on "m25p80":
0x000000000000-0x000000080000 : "u-boot-spl"
0x000000080000-0x000000400000 : "test"
.....
UBIFS: parse sync
UBIFS: start fixing up free space
RIO: discover master port 0, RIO0 mport
UBIFS: free space fixup complete
UBIFS: mounted UBI device 0, volume 1, name "rootfs"
UBIFS: file system size: 107421696 bytes (104904 KiB, 102 MiB, 846 LEBs)----------------------不明白rootfs 卷 大小为啥 还是 为102M？
UBIFS: journal size: 9023488 bytes (8812 KiB, 8 MiB, 72 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 0:13.
Freeing init memory: 168K
