I have stored multiple device trees in my emmc (ext4 formatted) partition and
I want to load a certain device tree file from emmc, but if this fails (i.e.
the device tree file doesn't exist) it should default to a device tree that
is stored in memory. 

For example if I run this: 


I get a return of:


Is there a way I can parse this return from ext4load to check if the size is
null or not null?

The aim (in pseudo code) is 

Does uBoot offer functionality for what I am after?  or should I be
approaching it with a different method. 

Thanks





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