Mark bad eraseblock back to good

Mark bad eraseblock back to good

[Spinelli, Claudio (Claudio)]

Hi,

I am using a nand flash that has a lot of marked bad eraseblock. I think
that are marked bad from previous mistake in my nand flash driver.
Does anybody have a modified flash_eraseall that marks bad eraseblock
back to good. Or any scripts that does that?

Thanks
Claudio

Re: Mark bad eraseblock back to good

[postmaster]

 >Does anybody have a modified flash_eraseall that marks bad eraseblock
 >back to good. Or any scripts that does that?


Hi

If you are using u-boot, there is a u-boot command (I can not remember 
its name) to mark bad eraseblocks as good.

Ensar

Re: Mark bad eraseblock back to good

[Ricard Wanderlof]

On Fri, 17 Oct 2008, Spinelli, Claudio (Claudio) wrote:

> Hi,
>
> I am using a nand flash that has a lot of marked bad eraseblock. I think
> that are marked bad from previous mistake in my nand flash driver.
> Does anybody have a modified flash_eraseall that marks bad eraseblock
> back to good. Or any scripts that does that?

The inability to remove bad block markers is built into the mtd code so 
there is no way around it using a userspace program.

It is easy however to remove or comment out the relevant lines in the mtd 
code, rebuild the kernel, and then use flash_erase to erase the blocks.

/Ricard
--
Ricard Wolf Wanderlöf                           ricardw(at)axis.com
Axis Communications AB, Lund, Sweden            www.axis.com
Phone +46 46 272 2016                           Fax +46 46 13 61 30

RE: Mark bad eraseblock back to good

[Singh, Vimal]

> >Does anybody have a modified flash_eraseall that marks bad eraseblock
>  >back to good. Or any scripts that does that?
> 
> 
> Hi
> 
> If you are using u-boot, there is a u-boot command (I can not remember
> its name) to mark bad eraseblocks as good.
> 
Use 'nand scrub' (from u-boot), it really cleans NAND erasing bad blocks.

NOTE: scrub option will erase all factory set bad blocks! There is no reliable way to recover them. 

vimal