Question about MTD Erase mechanism.

Question about MTD Erase mechanism.

[Vinit Agnihotri]

I have 1 question about MTD Erase mechanism.

Say we have a MTD device with 'n' no. of blocks. Each block is of size
100Bytes. Once erased we can write 25bytes i.e. min_io_size is
25bytes. So once a block is erased I can perform 4 writes without
erasing it again only if those 4 writes are not overlapping. But if
any of those write is overlapping i.e. if re-write occurs then entire
block have to be erased.

So my question is who handles these types of conditions. I mean does
hardware handles such conditions or software have to handle such
situations? I mean who handles re-writing & erasures due to that???


Thanks & Regards
Vinit.

Re: Question about MTD Erase mechanism.

[Charles Manning]

On Tuesday 20 February 2007 19:41, Vinit Agnihotri wrote:
> I have 1 question about MTD Erase mechanism.
>
> Say we have a MTD device with 'n' no. of blocks. Each block is of size
> 100Bytes. Once erased we can write 25bytes i.e. min_io_size is
> 25bytes. So once a block is erased I can perform 4 writes without
> erasing it again only if those 4 writes are not overlapping. But if
> any of those write is overlapping i.e. if re-write occurs then entire
> block have to be erased.

That's a pretty contrived example, and depends on the type of flash etc.
>
> So my question is who handles these types of conditions. I mean does
> hardware handles such conditions or software have to handle such
> situations? I mean who handles re-writing & erasures due to that???

Software of course. Hardware is pretty dumb stuff and cannot track and enforce 
algorithmic rules like that. 


>
>
> Thanks & Regards
> Vinit.
>
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