[sorry if this is the wrong list, please direct me to the right one as needed]

I’m trying to get my head wrapped around FDT to understand how UEFI firmware can produce this (and possibly use it internally) and pass it to the OS.

I’ve been trying to find the authoritative specification describing DT and FDT.  My experience searching resulted in a lot of dead links.  Is the spec the ePAPR specification?  How does this specification get updated to provide compatibility or enhancements that the current spec does not address like ARM architecture additions?

Also is there a central registry, if any, of strings for vendors or compatible hardware?  For example if I have a property ‘compatible = “hp,widget123”;’ who determines whether ‘hp’ standard for Hewlett-Packard or Henry’s Pickles?  Along the same lines if there is a standard interface like a “gic” where is the spec/document describing what a “gic” is and how is it updated?

Sorry for the newbie DT questions... I guess I’ve been spoiled by the UEFI spec providing all the information I’ve needed in the past in once place.  :)

Thanks,

Eugene