本部分命令所在包：mtd-utils
flash_erase
作用 | 擦出指定范围内flash的内容。 |
格式 | flash_erase [options] MTD_DEVICE <start offset> <block count> MTD_DEVICE：待擦除的分区，如/dev/mtd0 若不指定start offset和block count，默认擦出起始位置的第一块，使相应flash变为全1。 若block count为0，则擦除整个分区 |
参数 | |
-j, --jffs2 | format the device for jffs2 |
-N, --noskipbad | don't skip bad blocks |
-u, --unlock | unlock sectors before erasing |
-q, --quiet | do not display progress messages |
--silent | same as --quiet |
--help | display this help and exit |
--version | output version information and exit |
示例 | |
flash_erase /dev/mtd0 0x40000 5 | |
flashcp
作用 | 把文件写到flash中 |
格式 | flashcp [ -v | --verbose ] <filename> <device> filename: 文件名。这个文件是mkfs.ubifs等命令制作出来的 device： flash设备节点：例如：/dev/mtd0 类似于dd命令 |
nandwrite
作用 | 向flash中写数据 |
格式 | nandwrite [OPTION] MTD_DEVICE [INPUTFILE|-] |
参数 | |
-a, --autoplace | Use auto oob layout |
-j, --jffs2 | Force jffs2 oob layout (legacy support) |
-y, --yaffs | Force yaffs oob layout (legacy support) |
-f, --forcelegacy | Force legacy support on autoplacement-enabled mtd device |
-m, --markbad | Mark blocks bad if write fails |
-n, --noecc | Write without ecc |
-N, --noskipbad | Write without bad block skipping |
-o, --oob | Image contains oob data |
-O, --onlyoob | Image contains oob data and only write the oob part |
-r, --raw | Image contains the raw oob data dumped by nanddump |
-s addr, --start=addr | Set start address (default is 0) |
-p, --pad | Pad to page size |
-b, --blockalign=1|2|4 | Set multiple of eraseblocks to align to |
-q, --quiet | Don't display progress messages |
--help | Display this help and exit |
--version | Output version information and exit |
示例 | |
nandwrite -p /dev/mtd0 /tmp/rootfs.jffs2 | |
nanddump
作用 | 打印flash数据（block size,erasesize,oobblock 大小，oob data ,page data等；同时也会作坏块检测） |
格式 | nanddump [OPTIONS] MTD-device |
参数 | |
-a --forcebinary | Force printing of binary data to tty |
-c --canonicalprint | Print canonical Hex+ASCII dump |
-f file --file=file | Dump to file |
-l length --length=length | Length |
-n --noecc | Read without error correction |
-N --noskipbad | Read without bad block skipping |
-o --omitoob | Omit oob data |
-b --omitbad | Omit bad blocks from the dump |
-p --prettyprint | Print nice (hexdump) |
-q --quiet | Don't display progress and status messages |
-s addr --startaddress=addr | Start address |
示例 | |
nanddump -p -c -l 4096 -f nandinfo.txt /dev/mtd0 | |
mtdinfo
作用 | 打印mtd信息：mtd设备数目、当前mtd设备（以mtdN格式打印） |
格式 | mtdinfo [-m <MTD device number>] [-u] [-h] [-V] [--mtdn <MTD device number>] [--ubi-info] [--help] [--version] mtdinfo <MTD device node file name> [-u] [-h] [-V] [--ubi-info] [--help] [--version] |
参数 | |
-m, --mtdn=<MTD device number> | MTD device number to get information about |
-u, --ubi-info | print what would UBI layout be if it was put on this MTD device |
-a, --all | print information about all MTD devices |
-h, --help | print help message |
-V, --version | print program version |
示例 | |
mtdinfo - (no arguments) print general MTD information mtdinfo -m 1 - print information about MTD device number 1 mtdinfo /dev/mtd0 - print information MTD device /dev/mtd0 mtdinfo /dev/mtd0 -u - print information MTD device /dev/mtd0 and include UBI layout information mtdinfo -a - print information about all MTD devices and include UBI layout information mtdinfo -u - | |
mtd_debug
作用 | 调试mtd |
格式 | mtd_debug info <device> mtd_debug read <device> <offset> <len> <dest-filename> mtd_debug write <device> <offset> <len> <source-filename> mtd_debug erase <device> <offset> <len> |
参数 | |
info | 打印mtd信息： |
read | 读出flash的数据写到指定文件 |
write | 写指定文件的数据到flash |
erase | 擦除指定的位置 |
示例 | |
示例1：mtd_debug info /dev/mtd8 mtd.type = MTD_NANDFLASH mtd.flags = MTD_CAP_NANDFLASH mtd.size = 41943040 (40M) mtd.erasesize = 131072 (128K) mtd.writesize = 2048 (2K) mtd.oobsize = 128 regions = 0 示例2：mtd_debug read /dev/mtd8 read_test | |
