Larger designs end up in netlist traversal limit being reached

[acomodi]

The netlist reading traversal is exceeded for larger designs. It seems that, at the moment, the traversal limit is set to 32G, and the latest Linux-capable litex design fails upon reaching this limit.

It may be possible that there is a bug when reading the netlist, for which the limit is reached too soon, but increasing it to 64G seems to let at least the netlist reading step to pass.

The error looks like the following:

nextpnr-fpga_interchange --chipdb /tmpfs/src/github/fpga-tool-perf/env/interchange/devices/xc7a100t/xc7a100t.bin --package csg324 --xdc /tmpfs/src/github/fpga-tool-perf/src/vexriscv-smp/constr/arty-a100t.xdc --netlist vexriscv-smp.netlist --write vexriscv-smp.routed.json --phys vexriscv-smp.phys --log nextpnr.log
terminate called after throwing an instance of 'kj::ExceptionImpl'
  what():  capnp/arena.c++:153: failed: Exceeded message traversal limit.  See capnp::ReaderOptions.
stack: 5581ad6ffb86 5581ad59dc06 5581ad5ddb4f 5581ad5c8c42 5581ad55a580 2b4f5ceec83f 5581ad55d5ff
/bin/bash: line 1: 18880 Aborted                 nextpnr-fpga_interchange --chipdb /tmpfs/src/github/fpga-tool-perf/env/interchange/devices/xc7a100t/xc7a100t.bin --package csg324 --xdc /tmpfs/src/github/fpga-tool-perf/src/vexriscv-smp/constr/arty-a100t.xdc --netlist vexriscv-smp.netlist --write vexriscv-smp.routed.json --phys vexriscv-smp.phys --log nextpnr.log