JFFS2 SUMMARY nodes aren't working
havasi at inf.u-szeged.hu
Tue Mar 27 08:53:07 EDT 2007
Joakim Tjernlund írta:
> On a fresh JFFS2 root FS image with summary nodes there is no
> difference in mount time when enabling summary support in kernel(2.6.20,
If you use NOR flash with relatively small erase block, summary will not
really chance to speed up the mount process.
Anyway you should check the summary is really working or not. Use the
Enable the JFFS33 debugging options (min. debug level 1) in your kernel
configuration and recompile the kernel. You see the following messages
in your kernel log. When you load the jffs2 kernel module you can see
the following message:
"JFFS2 version 2.2. NAND SUMMARY" (in case of summary is enabled, maybe
the NAND is skipped if you doesn't have writebuffer compiled in).
If summary is enabled and something went wrong, maybe the image on flash
has no summary info:
"no summary found in jeb 0x%08x. Apply original scan." where %08x is
replaced by the offset of the jeb.
If you see debug information which begin with "jffs2_sum_" and there is
no error in your log it means the summary works.
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