Hi Wolfgang Denx, > > Closing a file descriptor does not guarantee that the data has been > > successfully saved to disk, as the kernel might defer the write. > > What is the exact problem you are trying to fix? > > I mean, when exactly does adding the sync play a role?
I'm using fw_setenv during system update process. The sequence of such a shell script is something like (much simplified): ... fw_setenv state=2 dd if=... of=/dev/mmcblk0... fw_setenv state=1 ... reboot The (redundant) environment is stored in a eMMC flash. The env var 'state' gives a hint to U-Boot whether/where the process was interrupted. So my intension is to be absolutely sure, that when fw_setenv returns, the environment is written out to disk. Best regards, Michael _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
