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How does flash erase block start on mtd1?
flash_erase MTD-device [start] [cnt (# erase blocks)] [lock] This command erases cnt blocks, starting from block start, on MTD-device, which is the character device that you wish to erase from (e.g. /dev/mtd1).
Where do you erase bad blocks in MTD?
For erase make sure, that you don’t erase factory-marked bad blocks. They are marked in the 6th byte (offset 0x5) in the out of band area of the first page of a block. The block is bad, if any bit in this byte is zero. If you erase such a block, the bad block information is erased too and lost.
Is there a flash eraseall command for NAND?
Flash_eraseall does not attempt to release blocks marked as bad. Using the -j parameter simply adds another clean marker in those empty blocks so jffs does not do unnecessary erases ‘nand scrub’ ‘nand erase clean’ and ‘nand erase’ would appear to be the tools you need, but as far as I know they are only available under Uboot.
What kind of device is a MTD device?
An “mtd device” is a pleonasm. Unix traditionally only knew block devices and character devices. Character devices were things like keyboards or mice, that you could read current data from, but couldn’t be seeked and didn’t have a size.
Can You flash erase a device as a regular user?
A entry will show that it’s mounted, and the flash tool may not be able to erase the device while mounted. If there is an entry here, then you can unmount it using the command, umount. Then try running the erase command. Can you flash erase a device as a regular user?
Is there a way to erase a flash chip?
Yes, if you use your bootloader to erase the flash chip and copy a file-system image to it. For erase make sure, that you don’t erase factory-marked bad blocks. They are marked in the 6th byte (offset 0x5) in the out of band area of the first page of a block.
How does MTD work with compact flash chips?
Many of these include Flash Translation Layer (FTL) hardware that takes care of many of the concerns surrounding flash usage, such as wear-leveling and bad blocks. Compact Flash — handled by the PC Card/IDE subsystems, depending on the implementation The MTD subsystem provides a number of mechanisms for interacting with raw flash chips.