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It is already a 64-bit float or "double" as everyone calls it except in the ethercat-conf.xml file. Where it is called float.
Linuxcnc switched from 32-bit floats to 64-bit floats somewhere version 2.4 or so.

If this line works for you, then that is the best you can do.
This takes a signed integer from Ethercat, obviously the device's encoder position comes as a signed 32-bit integer. This is then converted into a halfloat, which is a double. I think this is what you ask for. All floats in hal are 64-bit doubles.

The conversions to float aren't named very good
"float": ethercat signed 32-bit integer to 64-bit hal float
"float-unsigned": ethercat unsigned 32-bit integer to 64-bit hal float
"float-ieee": ethercat floating point 32-bit REAL to 64-bit hal float
"float-double-ieee": ethercat floating point 64-bit LREAL to 64-bit hal float

is not working fore me
machine.home.axis:c is ref my b axis
machine.home.axis:z is ref y2
machine.home.axis:b is ref my Z

Ok I will try these commands, but I ask you, if I wanted to read or write in a PDO a float 64 value would it be possible?

This will mean that the pin that will be created will be declared as float 64.

halType="double"?

or hal non support pin declared 64 bit ?