Hi list,
I am trying to debug this problem in a system I am developing:
at some point I need to write a number to a file, and then reboot via an
external device the machine. That device will cut of the power for a moment,
and the machine will power on again (this is to overcome a fault we could not
overcome otherwise). Before the reboot, I "umount" the proper partition and
then "sync".
For some reason, on one machine we see that the data is not updated and the
original data is kept in the file. I konw empirically that if I add a
"sleep(5)" after the umount, and before the "reboot" the data is written to
the disk.
Any tips how to debug this?
* the system is a TI 2.6.32 kernel (OMAP)
* the data is saved using fopen()
* disk is umounted using system("umount /data"), and then I call from C to
sync();
* Cannot print debug this easily since the reboot is automated at the start
of the APP, and then busybox's "login" breaks my serial terminal (like this
eats "\n", git fixes if I press enter)
* The application is also multi-threaded to add more difficulty ...
* FS is JFFS2
* again the workaround is a "sleep(5)"
Any ideas?
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