CACHE : Contains the update package which is downloaded from server. Also holds the log file for recovery
RECOVERY : Holds the recovery boot image(When updating the system we boot into recovery mode by using the boot image stored in this partition
RECOVERYFS : Holds recovery filesystem(including the recovery module that actually runs goes and updates the system). The recovery.img in the RECOVERY partition boots into this rootfs.
FOTA : After the update package is downloaded from the server it is saved into the cache partition. After that the userspace app that does the download writes a special cookie into the FOTA partition. This cookie tells the bootloaders to take the necessary steps to boot into recovery mode
MISC : Not really used in 9x15
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