reboot-mode: read the boot mode from RTC memory
RTC devices could provide battery-backed memory that can be used for storing the reboot mode magic value. Add a new reboot-mode back-end that uses RTC to store the reboot-mode magic value. The driver also supports both endianness modes. Signed-off-by: NNandor Han <nandor.han@vaisala.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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