Mtdutils

About

The MTD Utilities are a collection of tools that allow the user to interact with the MTD subsystem in the kernel to perform operations on Flash devices. The most commonly used utilities supported are:

• flash_erase - Erases an erase block of flash
• flash_eraseall - Erases the entire flash device
• flashcp - Copies data into flash
• flash_info - Displays information about Flash devices
• flash_lock - Lock flash pages to prevent writing
• flash_unlock - Unlock flash pages to allow writing
• mkfs.jffs2 - Create a JFFS2 file system image from an existing file system
• nandwrite - Write an input file (i.e. JFFS2 or YAFFS2 image) to the NAND Flash device

Visit MTD utils home page for more information.

Source Download Location

• Visit Download mtd utils source

Click on snapshot to get the tar.gz package.

Cross compiling

• Cross compilation command - make CC=$(TOOL_CHAIN_PREFIX)-gcc
  • The TOOL_CHAIN_PREFIX corresponds to the tool chain in use. Set this based on your tool chain. Also make path to toolchain is exported as part of $PATH.
• Dependancy : The MTD utilities require the liblzo package to be installed on you Linux development host in order to compile. This package is usually installed in the /usr/local/lib directory as liblzo2.la and liblzo2.a

If you do not have liblzo installed you can download the sources from Download liblzo package. After downloading do the following -

• host$ tar xzf lzo-version.xy.z.tar.gz
• host$ cd lzo-x.yz.z
• host$ ./configure
• host$ make
• host$ make install

Now you can go for the mtd utils build as shown in first step.

Test setup

• EVM booted up with NFS configuration.

Execution

Nand write command

• ./nandwrite -b 1 -n /dev/mtd4 -p uImage

Nand write options

• -b --blockalign
• -n - Write without ecc
• -p - pad to page size

Flash info command

• ./flash_info /dev/mtd4

Nand dump command

• ./nanddump -f dump -n -l 5000 /dev/mtd2
• -f is filename option. The above command will dump 5000 bytes(length option -l) from /dev/mtd2 partition by reading without error correction(-n).

Copy to flash command

• ./flashcp file /dev/mtd4

ftl check command

• ./ftl_check -v /dev/mtd2

Mtd debug command

• ./mtd_debug info /dev/mtd2
• ./mtd_debug read /dev/mtd2 0 1000 dump
• ./mtd_debug write /dev/mtd4 0x0020000 1024 filename

Nand test command

• ./nandtest -k -o 0x0020000 -l 0x40000 /dev/mtd4
• -o is offset.
• -l is length in bytes.
• restore data after tests.

Flash erase command

• ./flash_eraseall -j /dev/mtd4

Scripts

Scripts, execution logs - File:Mtd utils script logs.zip