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List:       linux-embedded
Subject:    Re: ramfs/tmpfs for application partition
From:       Gilad Ben-Yossef <gilad () codefidence ! com>
Date:       2009-01-18 13:55:27
Message-ID: 497334CF.5020400 () codefidence ! com
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Jacob Avraham wrote:

> Gilad,
>
> Not out of the woods yet.
>
> I can’t just burn a tar ball straight into a raw mtd partition. When 
> I’ll try to untar it, if I’ll do:
>
> tar zxf /dev/mtd6
>
> tar will read the whole mtd partition, and I don’t think it’s a good 
> idea to use a raw device as tar file.
>
> So should I package the tar in a filesystem, like cramfs?
>
That's certainly possible - just make sure your tar file is smaller then 
the 256Mb file limit of cramfs (if memory serves me right) - otherwise 
just use squashfs.


I'll add that if you're already going to have a file system (and your 
reasons seems to make sense to me) I would have just forgot about the 
tar file and put the file in cramfs/squashfs to begin with and just copy 
them over the initramfs during boot (something like cp -a /mnt/mtd6/* /).

> In that case, I don’t need to compress the tar file, as cramfs is 
> compressed, right?
>
That is correct.


Gilad




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