Disadvantage of using yaffs checkpointing ?

Disadvantage of using yaffs checkpointing ?

[Shivdas Gujare]

Hi All,

I am very new to mtd & yaffs and working on boottime optimization and
found that yaffs checkpointing helps to mount
yaffs2 very quickly. I tried it, and was able to save almost 4sec for
128MB partitioned nand.

Since everything looks very good If I use yaffs checkpointing feature
but have a doubt, are there any disadvantage of using check-pointing
by default in final product?

I understood that, check-pointing only disables boot time nand block
scanning & marking it bad if found,
and takes "system snapshot" while using "umount /dev/mtdblockN" which
it use in next boot.
So, If I decided to use "checkpointing" with "umount" while powering
off the device in final product,
are there going to be any problems I will face avoiding block scanning?

Thanks lot for any help.

Thanks and Regards,
Shivdas Gujare

Re: Disadvantage of using yaffs checkpointing ?

[Charles Manning]

On Tuesday 02 March 2010 15:01:08 Shivdas Gujare wrote:
> Hi All,
>
> I am very new to mtd & yaffs and working on boottime optimization and
> found that yaffs checkpointing helps to mount
> yaffs2 very quickly. I tried it, and was able to save almost 4sec for
> 128MB partitioned nand.
>
> Since everything looks very good If I use yaffs checkpointing feature
> but have a doubt, are there any disadvantage of using check-pointing
> by default in final product?
>
> I understood that, check-pointing only disables boot time nand block
> scanning & marking it bad if found,
> and takes "system snapshot" while using "umount /dev/mtdblockN" which
> it use in next boot.
> So, If I decided to use "checkpointing" with "umount" while powering
> off the device in final product,
> are there going to be any problems I will face avoiding block scanning?
>
> Thanks lot for any help.
>

You would do better asking yaffs questions on the yaffs list.

http://www.aleph1.co.uk/mailman/listinfo/yaffs

-- Charles

Re: Disadvantage of using yaffs checkpointing ?

[Shivdas Gujare]

On Mon, Mar 1, 2010 at 6:31 PM, Charles Manning <manningc2@actrix.gen.nz> wrote:
> On Tuesday 02 March 2010 15:01:08 Shivdas Gujare wrote:
>> Hi All,
>>
>> I am very new to mtd & yaffs and working on boottime optimization and
>> found that yaffs checkpointing helps to mount
>> yaffs2 very quickly. I tried it, and was able to save almost 4sec for
>> 128MB partitioned nand.
>>
>> Since everything looks very good If I use yaffs checkpointing feature
>> but have a doubt, are there any disadvantage of using check-pointing
>> by default in final product?
>>
>> I understood that, check-pointing only disables boot time nand block
>> scanning & marking it bad if found,
>> and takes "system snapshot" while using "umount /dev/mtdblockN" which
>> it use in next boot.
>> So, If I decided to use "checkpointing" with "umount" while powering
>> off the device in final product,
>> are there going to be any problems I will face avoiding block scanning?
>>
>> Thanks lot for any help.
>>
>
> You would do better asking yaffs questions on the yaffs list.
>
> http://www.aleph1.co.uk/mailman/listinfo/yaffs
>

Thanks Charles, for pointing to right mailing list.

Thanks and Regards,
Shivdas Gujare



> -- Charles
>
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