You should be using the slice name.
e.g. selecting the D pin of a BFF bel shows the following General properties:
View attachment 136991
If you use the following command in the Tcl console:
get_bel_pins SLICE_X6Y55/BFF/* you will get the following back:
SLICE_X6Y55/BFF/CE SLICE_X6Y55/BFF/CK SLICE_X6Y55/BFF/D SLICE_X6Y55/BFF/SR SLICE_X6Y55/BFF/Q
You also seem to have a typo for the -to get_bel_pins command:
Code:
This:
find_routing_path -from [get_bel_pins CLBLL_L_X2Y51/A5FF/Q] -to get_bel_pins[B][COLOR="#FF0000"][[/COLOR][/B]CLBLL_L_X2Y51/BFF/D]
should be this:
find_routing_path -from [get_bel_pins SLICE_X0Y51/A5FF/Q] -to [get_bel_pins SLICE_X0Y51/BFF/D]