open-source-silicon.dev

Found it
```set ::env(GLB_RT_MAXLAYER) 5```

Well this would still allows `met4` it would block `met5`. Also this is for FastRoute and IME won't totally block it, TritonRoute will still use it, just with less probability.

Isn't there some weird numbering difference where 5 really means met4?

Layer 1 is `li0`  , Layer 2 is `met1`,   ... Layer 6 is `met5`

Cut and paste error, that should have said 6 for met5

Which is odd since you can't route on li0.

you probably don't want to but ... you can.