The router began as a port of FreeRouting and has grown its own engine
(negotiated congestion, tree nets, exact checks, axis escapes), and
'freeroute' was one letter from the project it no longer follows. The
package, module and command are now rpmroute; the freeroute command stays
as an alias, and the RPMROUTE / RPMROUTE_ORACLE_JAVA variables fall back
to the old FREEROUTE names. Version 2026.10.07. Routing is unchanged: a
PCBench board routes to a byte-identical session either way.
Add channel_pack.dsn: three nets whose pads spread wider than a wall gap, so they
must converge and pack into lanes. Plain room routing (shove on or off) drops >= 1
net under every net ordering; the packer connects all three under every ordering,
DRC-clean (search tree and independent emitted-copper check).
The falsifiable boundary test sweeps the gap width for N=3 and N=4 and asserts the
packer connects all N iff the gap meets the geometric feasibility width
(N-1)*(width+clearance) + 2*(half_width+clearance), never routes fewer than greedy
below it, and never false-packs. Determinism, endpoints-on-pads, valid SES, and
pack=False-equals-default (additive) are covered.
rsp2k