[OpenBIOS] set package unit in forth

[BALATON Zoltan]

Hello,

I'm trying to port fdt unflattening from SLOF to OpenBIOS but need some 
help with understanding and implementing equivalent forth words, The SLOF 
fdt.fs uses set-unit which is defined in

https://github.com/aik/SLOF/blob/master/slof/fs/node.fs

: set-space    get-node dup >r node>space ! true r> node>space? ! ;
: set-address  my-#address-cells 1 ?DO
                get-node node>space i cells + ! LOOP ;
: set-unit     set-space set-address ;

These set the unit address manipulating the fields of the node struct as 
far as I understand.

But I don't know how to do the same in OpenBIOS. OpenBIOS implements the 
word that returns these values that set-unit is supposed to change in

https://github.com/openbios/openbios/blob/master/forth/device/package.fs#L19...

as

: my-unit ( -- phys.lo ... phys.hi )
   ?my-self >in.my-unit
   my-#acells tuck /l* + swap 0 ?do
     /l - dup l@ swap
   loop
   drop
   ;

but I don't understand how these are stored in OpenBIOS and how to change 
them. Could somone who understands forth or know OpenBIOS more suggest an 
implementation of set-unit for OpenBIOS please?

We'll also need set-node which sets active-package I think so suggestions 
for that are also welcome.

Thank you,
BALATON Zoltan