Youta Chen wrote:
> Hi ,
> I want to set up 128GB Nand Flash filesystem in linux. I'm not
> familiar with YAFFS2, could I ask you that, can YAFFS2 handle such a
> huge file system? And what's the maximum file system YAFFS2 can handle
> on paper? That's to say, we could assume the RAM is large enough.
>
> Here is yaffs_PackedTags2TagsPart definition in
> /yaffs2/yaffs_packedtags2.h,
> typedef struct {
> unsigned sequenceNumber;
> unsigned objectId;
> unsigned chunkId;
> unsigned byteCount;
> } yaffs_PackedTags2TagsPart;
>
> That means the maximum filesystem size is:
> objectID * chunkId * chunkSize = 2^32 * 2 ^32 * 2kB = 2^75KB
> Am I right? I think there must be filesystem size limit somewhere,
> but I don't know where.
> Could you give me any suggestions? Any reply will be appreciate.
> Thanks!
I think you had better ask this on the YAFFS mailing list, see
http://www.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs. I am not
familiar with the internals of YAFFS; my goal is to only provide 2 thin
layers: one between eCos filesystems and YAFFS, one between YAFFS and
eCos NAND flash.
But as far as common sense suggests: my interpretation would be that
there is support for 2^32 chunks, and chunks are often 2KB. So, 2^32 *
2^11 is the number of bytes supported, which would be 8TB if I'm not
confused; and more for larger chunks. And I *think* that objectID is
something related to the file system, not to the flash.
Rutger
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