/********************************************************************************* * OK335xs 256M 512M nand flash make ubifs hacking * 声明: * 本文主要是记录分析如何生成ubifs文件系统。 * * 2015-11-14 晴 深圳 南山平山村 曾剑锋 ********************************************************************************/ \\\\\\\\\\\-*- 目录 -*-/////////// | 一、for 256M nand flash | 二、for 512M nand flash | 三、mkfs.ubifs Options: | 四、ubinize Options: | 五、分析示例: --------------------------------- 一、for 256M nand flash ./mkfs.ubifs –F -q -r rootfs -m 2048 -e 126976 -c 2047 -o ubifs.img ./ubinize -o ubi.img -m 2048 -p 128KiB ubinize.cfg 二、for 512M nand flash ./mkfs.ubifs –F -q -r rootfs_v2 -m 2048 -e 126976 -c 4040 -o ubifs.img ./ubinize -o ubi.img -m 2048 -p 128KiB ubinize.cfg 三、mkfs.ubifs Options: -r, -d, --root=DIR build file system from directory DIR -m, --min-io-size=SIZE minimum I/O unit size -e, --leb-size=SIZE logical erase block size -c, --max-leb-cnt=COUNT maximum logical erase block count -o, --output=FILE output to FILE -j, --jrn-size=SIZE journal size -R, --reserved=SIZE how much space should be reserved for the super-user -x, --compr=TYPE compression type - "lzo", "favor_lzo", "zlib" or "none" (default: "lzo") -X, --favor-percent may only be used with favor LZO compression and defines how many percent better zlib should compress to make mkfs.ubifs use zlib instead of LZO (default 20%) -f, --fanout=NUM fanout NUM (default: 8) -F, --space-fixup file-system free space has to be fixed up on first mount (requires kernel version 3.0 or greater) -k, --keyhash=TYPE key hash type - "r5" or "test" (default: "r5") -p, --orph-lebs=COUNT count of erase blocks for orphans (default: 1) -D, --devtable=FILE use device table FILE -U, --squash-uids squash owners making all files owned by root -l, --log-lebs=COUNT count of erase blocks for the log (used only for debugging) -v, --verbose verbose operation -V, --version display version information -g, --debug=LEVEL display debug information (0 - none, 1 - statistics, 2 - files, 3 - more details) -h, --help display this help text 四、ubinize Options: Example: ubinize -o ubi.img -p 16KiB -m 512 -s 256 cfg.ini - create UBI image 'ubi.img' as described by configuration file 'cfg.ini' -o, --output=<file name> output file name -p, --peb-size=<bytes> size of the physical eraseblock of the flash this UBI image is created for in bytes, kilobytes (KiB), or megabytes (MiB) (mandatory parameter) -m, --min-io-size=<bytes> minimum input/output unit size of the flash in bytes -s, --sub-page-size=<bytes> minimum input/output unit used for UBI headers, e.g. sub-page size in case of NAND flash (equivalent to the minimum input/output unit size by default) -O, --vid-hdr-offset=<num> offset if the VID header from start of the physical eraseblock (default is the next minimum I/O unit or sub-page after the EC header) -e, --erase-counter=<num> the erase counter value to put to EC headers (default is 0) -x, --ubi-ver=<num> UBI version number to put to EC headers (default is 1) -Q, --image-seq=<num> 32-bit UBI image sequence number to use (by default a random number is picked) -v, --verbose be verbose -h, --help print help message -V, --version print program version 五、分析示例: 1. for 256M nand flash: 1. ./mkfs.ubifs –F -q -r rootfs -m 2048 -e 126976 -c 2047 -o ubifs.img -F:file-system free space has to be fixed up on first mount -q:未知 -r:build file system from directory DIR -m:最小输入输出大小为2KiB(2048bytes),一般为页大小 -e:逻辑可擦除块大小为124KiB=(每块的页数-2)*页大小=(64-2)*2KiB=124KiB=126976bytes -c:最多逻辑可擦除块数目为2047(2047*128KiB=255.8MiB),这个可根据ubi volume来设置,实际上是设置此卷的最大容量。 -o:output to FILE 2. for 256M nand flash ubinize.cfg: [ubifs] mode=ubi image=ubifs.img // mkfs.ubi生成的源镜像 vol_id=0 // 卷序号 vol_size=231MiB // 卷大小 vol_type=dynamic // 动态卷 vol_name=rootfs // 卷名 vol_flags=autoresize 3. ./ubinize -o ubi.img -m 2048 -p 128KiB ubinize.cfg -o:输出文件名 -m:最小输入输出大小为2KiB(2048bytes),一般为页大小 -p:物理可擦出块大小为128KiB=每块的页数*页大小=64*2KiB=128KiB -s:用于UBI头部信息的最小输入输出单元,一般与最小输入输出单元(-m参数)大小一样。 2. for 512M nand flash: 1. ./mkfs.ubifs –F -q -r rootfs_v2 -m 2048 -e 126976 -c 4040 -o ubifs.img -F:file-system free space has to be fixed up on first mount -q:未知 -r:build file system from directory DIR -m:最小输入输出大小为2KiB(2048bytes),一般为页大小 -e:逻辑可擦除块大小为124KiB=(每块的页数-2)*页大小=(64-2)*2KiB=124KiB=126976bytes -c:最多逻辑可擦除块数目为2047(2047*128KiB=505MiB),这个可根据ubi volume来设置,实际上是设置此卷的最大容量。 2. for 512M nand flash ubinize.cfg: [ubifs] mode=ubi image=ubifs.img // mkfs.ubi生成的源镜像 vol_id=0 // 卷序号 // 卷大小(当然,个人感觉这里是错误的,在另外一份文件里面看到是492MiB,尚未验证) vol_size=231MiB vol_type=dynamic // 动态卷 vol_name=rootfs // 卷名 vol_flags=autoresize 3. ./ubinize -o ubi.img -m 2048 -p 128KiB ubinize.cfg -o:输出文件名 -m:最小输入输出大小为2KiB(2048bytes),一般为页大小 -p:物理可擦出块大小为128KiB=每块的页数*页大小=64*2KiB=128KiB -s:用于UBI头部信息的最小输入输出单元,一般与最小输入输出单元(-m参数)大小一样。