a typo in donut_pblock.xdc prevent the creation of the donut pblock
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--create_pblock donut
--add_cells_to_pblock [get_pblocks donut] [get_cells -quiet [list a0/donut_i]] -clear_locs
--resize_pblock [get_pblocks donut] -add {CLOCKREGION_X3Y3:CLOCKREGION_X5Y3}
+create_pblock donut
+add_cells_to_pblock [get_pblocks donut] [get_cells -quiet [list a0/donut_i]] -clear_locs
+resize_pblock [get_pblocks donut] -add {CLOCKREGION_X3Y3:CLOCKREGION_X5Y3}
