docs: update for GUI_TIMING

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

docs/user/FlowVariables.md

@@ -98,7 +98,7 @@ configuration file.
 | <a name="GND_NETS_VOLTAGES"></a>GND_NETS_VOLTAGES | Used for IR Drop calculation. |
 | <a name="GPL_ROUTABILITY_DRIVEN"></a>GPL_ROUTABILITY_DRIVEN | Specifies whether the placer should use routability driven placement. |
 | <a name="GPL_TIMING_DRIVEN"></a>GPL_TIMING_DRIVEN | Specifies whether the placer should use timing driven placement. |
-| <a name="GUI_NO_TIMING"></a>GUI_NO_TIMING | Skip loading timing for a faster GUI load. |
+| <a name="GUI_TIMING"></a>GUI_TIMING | Load timing information when opening GUI. For large designs, this can be quite time consuming. Useful to disable when investigating non-timing aspects like floorplan, placement, routing, etc. |
 | <a name="HOLD_SLACK_MARGIN"></a>HOLD_SLACK_MARGIN | Specifies a time margin for the slack when fixing hold violations. This option allows you to overfix. |
 | <a name="IO_PLACER_H"></a>IO_PLACER_H | The metal layer on which to place the I/O pins horizontally (top and bottom of the die). |
 | <a name="IO_PLACER_V"></a>IO_PLACER_V | The metal layer on which to place the I/O pins vertically (sides of the die). |
@@ -292,7 +292,7 @@ configuration file.
 - [GENERATE_ARTIFACTS_ON_FAILURE](#GENERATE_ARTIFACTS_ON_FAILURE)
 - [GLOBAL_PLACEMENT_ARGS](#GLOBAL_PLACEMENT_ARGS)
 - [GND_NETS_VOLTAGES](#GND_NETS_VOLTAGES)
-- [GUI_NO_TIMING](#GUI_NO_TIMING)
+- [GUI_TIMING](#GUI_TIMING)
 - [HOLD_SLACK_MARGIN](#HOLD_SLACK_MARGIN)
 - [IR_DROP_LAYER](#IR_DROP_LAYER)
 - [KLAYOUT_TECH_FILE](#KLAYOUT_TECH_FILE)

flow/Makefile

@@ -162,8 +162,6 @@ export TEST_DIR      ?= $(FLOW_HOME)/test
 
 $(foreach line,$(shell $(SCRIPTS_DIR)/defaults.py),$(eval export $(line)))
 
-export GUI_TIMING ?= 1
-
 PUBLIC=nangate45 sky130hd sky130hs asap7 ihp-sg13g2 gf180
 
 ifneq ($(wildcard $(PLATFORM_HOME)/$(PLATFORM)),)

flow/scripts/variables.yaml

@@ -228,9 +228,12 @@ IO_PLACER_V:
   stages:
     - floorplan
     - place
-GUI_NO_TIMING:
+GUI_TIMING:
   description: >
-    Skip loading timing for a faster GUI load.
+    Load timing information when opening GUI. For large designs, this can
+    be quite time consuming. Useful to disable when investigating non-timing
+    aspects like floorplan, placement, routing, etc.
+  value: 1
 FILL_CELLS:
   description: >
     Fill cells are used to fill empty sites. If not set or empty, fill cell insertion is skipped.