[Newbie] Few Queries related to JFFS2

[S Ashok]

Hi all,

I am working on embedded project where we are using
root filesystem with jffs2 filesystem type( 4MB NOR
FLASH). I have few queries related to it.

1. Is the erase block size specified while creating jffs2
image should be same as that of flash block size ?

2. I have read from the mailing list that free space has to
be left for proper functioning of GC ( hideing them from
userspace ). Is there any number ( one or two erase block
) ?


With Thanks,

[Josh Boyer]

Post by S Ashok
Hi all,
I am working on embedded project where we are using
root filesystem with jffs2 filesystem type( 4MB NOR
FLASH). I have few queries related to it.
1. Is the erase block size specified while creating jffs2
image should be same as that of flash block size ?

In general, yes.

Post by S Ashok
2. I have read from the mailing list that free space has to
be left for proper functioning of GC ( hideing them from
userspace ). Is there any number ( one or two erase block
) ?

JFFS2 figures this out when it mounts. The old hard coded method used 5
eraseblocks. To be safe, I would recommend starting with 5 free.

IIRC, JFFS2 will just mount the filesystem read-only if it doesn't have
enough free eraseblocks.

josh


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