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Cutting story short, warm start means that the MCU does have a continuous power supply and the RESET is not from the change of Vcc (cold start). In this mode the reset can be generated by watchdog, software, etc etc ..
Regards,
IanP
one important difference is that during a cold start (aka cold boot - initial application of power), volatile memory cells will power-up in an unpredictable way such that their contents will contain random data, and any configurable ports etc. will power-up into either unknown or default states.
In contrast, following a warm start (aka warm boot), although memory/port config etc may no longer contain desirable values (that may be why a warm boot is being called for ? ...) but they will no longer contain completely random data, as power will not have been removed from the system following the initial initialisation routines.
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