Has there been any effort to understand the changes needed to 
include/net/ieee802154.h and associated files within drivers/net/ieee802154 to 
support the ratification of 15.4-2020?  One prime example is the "Extended PHR" 
bit which was previously reserved to now allow extend the PHR of 2 more octets 
giving bits 8-11 to be used for "Frame Length MSB" and bits 12-15 marked as 
"Reserved" - this in combination of the legacy PHR bits 0-6 labeled as "Frame 
Length LSB" now allows for a frame MTU of 2048 octets.

The 802.15.4-2020 is available individually free of charge through the IEEE 
website through the IEEE Get Program. 
https://ieeexplore.ieee.org/document/9144691 

Is there a way to prototype these new changes to the spec with the 
mac802154_hwsim driver?

 -Jim

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