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Old 01-29-2009, 09:54 PM   #1
shashi_b
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Registered: Jan 2009
Posts: 2

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Exclamation flash_eraseall command for mtd device reports error


Hi ,

I am writing drivers for dataflash device and so far i have been able to create a single partition on flash as desired ,register the device with kernel and thereby able to load the flash driver module on boot.The flash partition does show up with "cat /proc/mtd".

However when i try to erase the flash using flash_eraseall before trying to mount the device i get the following error

command tried:
flash_eraseall -j /dev/mtd3

where mtd3 corresponds to my flash device node and is also present in /dev directory.

Output:

flash_eraseall : /dev/mtd3 : No such device or address

Looks like i am almost on the verge of getting it work but not without getting over this hurdle.

Any suggestions would be of great help.

Thanks in advance

Shashi
 
Old 08-26-2009, 05:21 AM   #2
electro323
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Registered: Aug 2009
Posts: 1

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Exclamation Writing directly into a flash nand

Hello,
I saw that u were working on flash nand.
Actually i am a student in engenneering and i am workin on Flash Nand.
The aim of my project is to write directly into the flash nand without using the File System's as JFFS2,YAFFS,etc..
I dont know if it is really possible to do it and how to proceed.
Hope i can get a response from you.
Thanks for your response
Wassim
 
Old 12-29-2009, 07:27 AM   #3
jimux
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Registered: Mar 2007
Posts: 11

Rep: Reputation: 1
Shashi B, There is a serious lack of documentation available on nand management tools and I am also trying to clean a nand flash that shows 98% bad blocks. I am sure that the problem is a software corruption rather than true hardware cell failure. The following may help.

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.
 
  


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