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Blocking a reset due to power cycling

Category: Hardware


I have a race condition for my reset and I am looking for solutions 

So I have a SOM and a MCU connected together in the system

The MCU reset lines are connected to the SOM for firmware updating 
The Som power is controlled by A gpio from the MCU

When the SOM is power cycled it can reset the MCU which is not wanted.
This could also cause the SOM from power cycling 

I want to avoid to adding pull up resistor as this may cause back powering  

I am thinking of putting some kind of IC that requires a pin to held in a particular state for duration before it resets. 
Are there particular IC's that would do this? 

are there types of IC's that would be better suited for this application