drt routes on metal6 despite using set_routing_layer ... metal1-metal5

[stefanottili]

Describe the bug

detailed_route uses metal6, ignoring
set_routing_layer -signal metal1-metal5 -clock metal1-metal5

Expected Behavior

drt shouldn't use metal6

Environment

M1 Mac
OpenROAD v2.0-15128-g136639014 (Aug 12th 2024)
Features included (+) or not (-): +Charts +GPU +GUI +Python

To Reproduce

please get the tar file containing lef/def/Makefile/risc2.or from #5557 and uncomment detailed_route

Relevant log output

[INFO GRT-0096] Final congestion report:
Layer         Resource        Demand        Usage (%)    Max H / Max V / Total Overflow
---------------------------------------------------------------------------------------
metal1          146284         55093           37.66%             0 /  0 /  0
metal2          252800        108230           42.81%             0 /  0 /  0
metal3          252800         59232           23.43%             0 /  0 /  0
metal4          202872         25778           12.71%             0 /  0 /  0
metal5          101278          1551            1.53%             0 /  0 /  0
---------------------------------------------------------------------------------------
Total           956034        249884           26.14%             0 /  0 /  0


[INFO DRT-0198] Complete detail routing.
Total wire length = 1555397 um.
Total wire length on LAYER metal1 = 43117 um.
Total wire length on LAYER metal2 = 660571 um.
Total wire length on LAYER metal3 = 621645 um.
Total wire length on LAYER metal4 = 219668 um.
Total wire length on LAYER metal5 = 10379 um.
Total wire length on LAYER metal6 = 16 um.
Total number of vias = 274013.
Up-via summary (total 274013):

Screenshots

No response

Additional Context

No response

[maliberty]

For historical reasons there are separate layer controls for grt & drt. You need to use -bottom_routing_layer / -top_routing_layer to control drt.