mkfs.jffs2: device table entries not the same type as in FS
mjd-linux-mtd at afork.com
Thu Sep 18 11:00:38 EDT 2008
I'm using buildroot, which can use mkfs.jffs2 to generate JFFS2
images. I'm having the problem that mkfs.jffs2 fails with this
% mkfs.jffs2 -e 0x20000 -l -s 0x800 -n -D device_table.txt -d root
mkfs.jffs2: root/dev/mem: file type does not match specified type!
The problem is that there is an entry for /dev/mem (plus lots of
others) in device_table.txt, but there is also an empty file called
root/dev/mem in the tree I've pointed mkfs.jfffs2 at. Now of course,
the problem would go away if there was no empty file there, but those
files are a consequence of generating other output types in buildroot
using fakeroot to imitate root-owned device files. It's not really
possible to make them go away.
Here's the code in mkfs.jffs2:
The comment says "It is ok for some types of files to not exit on disk
(such as device nodes), but if they _do_ exist the specified mode had
better match the actual file or strange things will happen....".
What strange things? If I change the code so it just replaces the
existing filesystem_entry, what will break?
Hoping you can help me understand that code.
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