behavior of JFFS2 and old data in flash
Holger Schurig
h.schurig at mn-solutions.de
Mon Apr 3 10:41:22 EDT 2006
Is the following statement correct?
When I have an JFFS2 file system which was used for some time
at a customer and now I want to re-flash it, then I have to
erase the whole flash (e.g. all of the 64 MB), even when my
image is only 2.5 MB. Otherwise at the next mount JFFS2 might
intermix sectors from the old image in unerase sectors and
from the new image".
Now, what if I use sumtool? AFAIK sumtool stores the erase sectors
inside an the image. Now JFFS2 knows where erased sectors are located
and doesn't scan the whole image. Therefore the old garbage in the
not-erased-sectors should't make a problem.
If this statement is true as well, then I could omit the
tediuous/time-consuming blockwise erase (my chips don't have a
erase-the-whole-chip function).
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