structural changes as requested in review

Author: ayan20985

CMakeLists.txt

@@ -55,17 +55,13 @@ option(ODIN_TIDY "Enable building odin with clang tidy" OFF)
 option(ODIN_SANITIZE "Enable building odin with sanitize flags" OFF)
 
 # Yosys plugins. Yosys is built when WITH_PARMYS or WITH_MOSAIC is on.
-# At least one of those options must be on (not enforced on Windows).
 option(WITH_PARMYS "Enable Yosys as elaborator and parmys-plugin as partial mapper" ON)
 option(WITH_MOSAIC "Enable mosaic yosys plugin as an alternative synthesis frontend" ON)
 option(SLANG_SYSTEMVERILOG "Enable building and installing Yosys-Slang plugin for parsing SystemVerilog" ON)
 
-if(NOT ${WITH_PARMYS} AND NOT ${WITH_MOSAIC})
-    if(WIN32)
-        message(STATUS "Neither parmys nor mosaic enabled (windows yosys plugins are disabled)")
-    else()
-        message(FATAL_ERROR "At least one of WITH_PARMYS or WITH_MOSAIC must be ON")
-    endif()
+if(NOT ${WITH_PARMYS} AND NOT ${WITH_MOSAIC} AND NOT ${WITH_ODIN})
+    message(FATAL_ERROR "At least one synthesis frontend must be enabled "
+                        "(WITH_PARMYS, WITH_MOSAIC, or WITH_ODIN)")
 endif()
 
 if(${WITH_PARMYS} OR ${WITH_MOSAIC})

dev/pylint_check.py

@@ -23,6 +23,7 @@
 paths_to_lint = [
     (repo_path, False),
     (repo_path / "dev", True),
+    (repo_path / "mosaic", True),
     (repo_path / "odin_ii", True),
     (repo_path / "ace2", True),
     (repo_path / "doc", True),

mosaic/CMakeLists.txt

@@ -1,3 +1,5 @@
+cmake_minimum_required(VERSION 3.16)
+
 # mosaic yosys plugin, built as part of the vtr tree.
 
 project("mosaic")

mosaic/README.md

@@ -14,7 +14,7 @@ make -j$(nproc)
 
 The plugin is at `build/share/yosys/plugins/mosaic.so`. Yosys loads it with `plugin -i mosaic`.
 
-`WITH_MOSAIC` (default ON) and `WITH_PARMYS` (default ON) select the Yosys plugins. Yosys is built when either is on. At least one must be on.
+`WITH_MOSAIC` (default ON) and `WITH_PARMYS` (default ON) select the Yosys plugins. Yosys is built when either is on. At least one synthesis frontend (`WITH_PARMYS`, `WITH_MOSAIC`, or `WITH_ODIN`) must be enabled. To build VTR without Mosaic:
 
 ```shell
 make CMAKE_PARAMS="-DWITH_MOSAIC=OFF" -j$(nproc)

mosaic/wildebeest/CMakeLists.txt

@@ -1,3 +1,5 @@
+cmake_minimum_required(VERSION 3.16)
+
 # wildebeest sources compiled into the mosaic plugin
 add_library(wildebeest OBJECT
     src/clk_domains.cc

vtr_flow/misc/mosaic/README.md

@@ -0,0 +1,19 @@
+# Mosaic Synthesis Configuration
+This directory contains the synthesis configuration files used by the Mosaic frontend.
+
+
+
+## Layout
+- `template/`: shared synthesis driver and rule templates used by every architecture.
+  - `rules/`: shared Verilog/template files for techmapping (BRAM, multiply, adder, hardblock stubs).
+  - `abc/`: ABC delay scripts used during in-Yosys LUT mapping.
+  - `lut_models/`: LUT Verilog models for `max_level`.
+  - `synthesis.tcl`: main Yosys script copied into each run directory.
+  - `fix_blif_for_vpr.py`: post-synthesis BLIF cleanup (ram addr pads, hierarchical net dots, latch-Q uniquify).
+- `<arch_xml_stem>/`: optional per-architecture policy directories. Each contains:
+  - `arch_config.tcl`: architecture-specific knobs (hardblock aliases, soft/hard thresholds, costs, ABC script overrides).
+  - `rules/` (optional): rule template overlays that replace the corresponding shared template file for that architecture.
+
+Per-architecture directories are matched by the stem of the architecture XML filename passed to `run_vtr_flow.py`. When no matching directory exists, synthesis runs using defaults from `template/synthesis.tcl`.
+
+See `mosaic/README.md` at the repository root for full technical details.

vtr_flow/tasks/regression_tests/vtr_reg_basic_mosaic/k6/config/config.txt

@@ -28,4 +28,3 @@ pass_requirements_file=pass_requirements.txt
 # Script parameters
 script_params_common = -track_memory_usage -start mosaic -verilator_check -verilator_check_vectors 20000
 script_params_list_add =
-script_params_list_add = --reorder_rr_graph_nodes_algorithm random_shuffle