Add blockage layers
For the SRAM LEF to be imported by Coriolis with correct blockages, I think the blockage layers need to be defined here. For now I hacked them into the generated output thus (only the bottom three are used by the macro):
met1blk = createBL(tech, 'Metal1_BLK', BasicLayer.Material.blockage, gds2Layer=34, gds2DataType=5)
met2blk = createBL(tech, 'Metal2_BLK', BasicLayer.Material.blockage, gds2Layer=36, gds2DataType=5)
met3blk = createBL(tech, 'Metal3_BLK', BasicLayer.Material.blockage, gds2Layer=42, gds2DataType=5)
met1.setBlockageLayer(met1blk)
met2.setBlockageLayer(met2blk)
met3.setBlockageLayer(met3blk)