Index: toporouter/patches/0001-CONVERT-PCB-S-BASE-UNITS-TO-NANOMETERS.patch
===================================================================
--- toporouter/patches/0001-CONVERT-PCB-S-BASE-UNITS-TO-NANOMETERS.patch	(nonexistent)
+++ toporouter/patches/0001-CONVERT-PCB-S-BASE-UNITS-TO-NANOMETERS.patch	(revision 6822)
@@ -0,0 +1,79 @@
+From 97b3260ecf977dcaa959e51fbd39c6b0d7b414b7 Mon Sep 17 00:00:00 2001
+From: Andrew Poelstra <asp11@sfu.ca>
+Date: Fri, 5 Aug 2011 23:39:37 -0700
+Subject: [PATCH] *** CONVERT PCB'S BASE UNITS TO NANOMETERS ***
+
+Convert base units to nm, change Coord from int to long,
+change LARGE_VALUE from a magic number to (LONG_MAX / 2 - 1).
+
+Fixes-bug: lp-772027
+---
+ globalconst.h | 2 +-
+ src/const.h   | 8 ++++----
+ src/global.h  | 2 +-
+ src/main.c    | 4 ++--
+ 4 files changed, 8 insertions(+), 8 deletions(-)
+
+diff --git a/globalconst.h b/globalconst.h
+index 605d909..6599823 100755
+--- a/globalconst.h
++++ b/globalconst.h
+@@ -60,7 +60,7 @@
+ /* ---------------------------------------------------------------------------
+  * some limit specifications
+  */
+-#define LARGE_VALUE		10000000 /* maximum extent of board and elements */
++#define LARGE_VALUE		(LONG_MAX / 2 - 1) /* maximum extent of board and elements */
+  
+ #define	MAX_LAYER		16	/* max number of layer, check source */
+ 					/* code for more changes, a *lot* more changes */
+diff --git a/src/const.h b/src/const.h
+index 4f4534c..0885871 100644
+--- a/src/const.h
++++ b/src/const.h
+@@ -68,10 +68,10 @@
+ #define LN_2_OVER_2		0.346573590
+ 
+ /* PCB/physical unit conversions */
+-#define COORD_TO_MIL(n)	((n) / 100.0)
+-#define MIL_TO_COORD(n)	((n) * 100.0)
+-#define COORD_TO_MM(n)	((n) * 0.000254)
+-#define MM_TO_COORD(n)	((n) / 0.000254)
++#define COORD_TO_MIL(n)	((n) / 25400.0)
++#define MIL_TO_COORD(n)	((n) * 25400.0)
++#define COORD_TO_MM(n)	((n) / 1000000.0)
++#define MM_TO_COORD(n)	((n) * 1000000.0)
+ #define COORD_TO_INCH(n)	(COORD_TO_MIL(n) / 1000.0)
+ #define INCH_TO_COORD(n)	(MIL_TO_COORD(n) * 1000.0)
+ 
+diff --git a/src/global.h b/src/global.h
+index 731742d..a3a4ac1 100644
+--- a/src/global.h
++++ b/src/global.h
+@@ -64,7 +64,7 @@ typedef struct AttributeListType AttributeListType, *AttributeListTypePtr;
+ typedef struct unit Unit;
+ typedef struct increments Increments;
+ 
+-typedef int Coord;		/* pcb base unit */
++typedef long Coord;		/* pcb base unit */
+ typedef double Angle;		/* degrees */
+ 
+ #include "hid.h"
+diff --git a/src/main.c b/src/main.c
+index cd6ccfa..5dc761d 100644
+--- a/src/main.c
++++ b/src/main.c
+@@ -637,8 +637,8 @@ REGISTER_ATTRIBUTES (main_attribute_list)
+     Settings.ViaDrillingHole =
+       DEFAULT_DRILLINGHOLE * Settings.ViaThickness / 100;
+ 
+-  Settings.MaxWidth = MIN (MAX_COORD, MAX (Settings.MaxWidth, MIN_SIZE));
+-  Settings.MaxHeight = MIN (MAX_COORD, MAX (Settings.MaxHeight, MIN_SIZE));
++  Settings.MaxWidth  = CLAMP (Settings.MaxWidth, MIN_SIZE, MAX_COORD);
++  Settings.MaxHeight = CLAMP (Settings.MaxHeight, MIN_SIZE, MAX_COORD);
+ 
+   ParseRouteString (Settings.Routes, &Settings.RouteStyle[0], "cmil");
+ 
+-- 
+2.9.3
+
Index: toporouter/patches/LP.txt
===================================================================
--- toporouter/patches/LP.txt	(nonexistent)
+++ toporouter/patches/LP.txt	(revision 6822)
@@ -0,0 +1,65 @@
+Bug #846789 reported by KaiMartin on 2011-09-11
+
+Bug Description
+
+In current git-head the toporouter struggles indefinitely even for very simple
+boards.
+To reproduce:
+
+1) prepare a simple schematic: Two connected resistors are enough
+
+2) save as foo.sch
+
+3) pcb foo.pcb
+
+4) import schematic --> The resistors appear in the middle of the canvas
+
+5) execute the command "toporouter()"
+pcb claims a whole core indefinitely with no results whatsoever.
+
+---<)kaimartin(>---
+
+Tags: toporouter Edit Tag help
+Bert Timmerman (bert-timmerman) on 2011-09-11
+
+Changed in pcb:
+status: New ? Confirmed
+
+Andrew Poelstra (asp11) wrote on 2011-09-11: #1
+
+Hitting Ctrl+C in gdb after the lockup, and doing a backtrace, gives nested
+calls to swap_if_in_circle() roughly 10 000 deep. The offending line is gts/
+cdt.c:506.
+
+Andrew Poelstra (asp11) wrote on 2011-09-11: #2
+
+git bisect says I did it. Offending commit:
+
+commit 97b3260ecf977dcaa959e51fbd39c6b0d7b414b7
+Author: Andrew Poelstra <email address hidden>
+Date: Fri Aug 5 23:39:37 2011 -0700
+
+    *** CONVERT PCB'S BASE UNITS TO NANOMETERS ***
+
+    Convert base units to nm, change Coord from int to long,
+    change LARGE_VALUE from a magic number to (LONG_MAX / 2 - 1).
+
+    Fixes-bug: lp-772027
+
+Bert Timmerman (bert-timmerman) on 2011-11-19
+
+tags: added: toporouter
+
+DJ Delorie (djdelorie) wrote on 2011-11-19: #3
+
+could someone attach a known-to-hang .pcb for this? And instructions about
+which layers need to be visible during toporouting?
+
+Traumflug (mah-jump-ing) wrote on 2015-09-27: #4
+
+Marking "Low", because the Toporouter is generally considered to be redundant
+(and abandoned).
+
+Changed in geda-project:
+importance: Undecided ? Low
+