diff --git a/.gitignore b/.gitignore
index 736cd7761..8d425cc41 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,5 +4,6 @@
 ./rtl/modelsim/*.vcd
 *.vcd
 .*
+!.gitignore
 *.pyc
-__pycache__
\ No newline at end of file
+__pycache__
diff --git a/rtl/.gitignore b/rtl/.gitignore
new file mode 100644
index 000000000..f46f57342
--- /dev/null
+++ b/rtl/.gitignore
@@ -0,0 +1,4 @@
+/simulate/VX_define.h
+/simulate/VX_define_synth.h
+/VX_define_synth.v
+/results.txt
\ No newline at end of file
diff --git a/rtl/Makefile b/rtl/Makefile
index 645e5a064..32aee812c 100644
--- a/rtl/Makefile
+++ b/rtl/Makefile
@@ -30,6 +30,10 @@ MAKEMULTICPP=(cd obj_dir && make -j -f VVortex_SOC.mk OPT='-DVL_DEBUG' VL_DEBUG=
 
 THREADS ?= $(shell python3 -c 'import multiprocessing as mp; print(max(1, mp.cpu_count() // 2))')
 
+.PHONY: build_config
+build_config:
+	./gen_config.py --rtl_locations
+
 # -LDFLAGS '-lsystemc'
 VERILATOR:
 	verilator $(COMP) -cc $(SINGLE_CORE) $(INCLUDE) $(EXE) $(LIB) -CFLAGS '$(CF) -DVCD_OFF' $(LIGHTW)
diff --git a/rtl/VX_define.v b/rtl/VX_define.v
index bcd3b87d5..fa4966803 100644
--- a/rtl/VX_define.v
+++ b/rtl/VX_define.v
@@ -3,6 +3,22 @@
 
 `include "./VX_define_synth.v"
 
+`ifndef NT
+`define NT 4
+`endif
+`ifndef NW
+`define NW 8
+`endif
+`ifndef NUMBER_CORES_PER_CLUSTER
+`define NUMBER_CORES_PER_CLUSTER 2
+`endif
+`ifndef NUMBER_CLUSTERS
+`define NUMBER_CLUSTERS 1
+`endif
+
+// `define QUEUE_FORCE_MLAB 1
+// `define L3C 1
+
 `define NT_M1 (`NT-1)
 
 // NW_M1 is actually log2(NW)
@@ -15,7 +31,9 @@
 // `define ASIC 1
 // `define SYN_FUNC 1
 
+`ifndef NUM_BARRIERS
 `define NUM_BARRIERS 4
+`endif
 
 `define R_INST 7'd51
 `define L_INST 7'd3
@@ -105,8 +123,8 @@
 `define NO_STALL 1'h0
 
 
-`define TAKEN 1'b1
-`define NOT_TAKEN 1'b0
+`define TAKEN 1'h1
+`define NOT_TAKEN 1'h0
 
 
 `define ZERO_REG 5'h0
@@ -125,59 +143,105 @@
    -199
 
 
+`ifndef NUMBER_CORES
 `define NUMBER_CORES (`NUMBER_CORES_PER_CLUSTER*`NUMBER_CLUSTERS)
+`endif
 
-//`define SINGLE_CORE_BENCH
+// `define SINGLE_CORE_BENCH
 
+`ifndef GLOBAL_BLOCK_SIZE_BYTES
 `define GLOBAL_BLOCK_SIZE_BYTES 16
+`endif
 
 // ========================================= Dcache Configurable Knobs =========================================
 
 // General Cache Knobs
+   // Size of cache in bytes
+   `ifndef DCACHE_SIZE_BYTES
+   `define DCACHE_SIZE_BYTES 4096
+   `endif
    // Size of line inside a bank in bytes
+   `ifndef DBANK_LINE_SIZE_BYTES
    `define DBANK_LINE_SIZE_BYTES `GLOBAL_BLOCK_SIZE_BYTES
+   `endif
    // Number of banks {1, 2, 4, 8,...}
+   `ifndef DNUMBER_BANKS
    `define DNUMBER_BANKS 8
+   `endif
    // Size of a word in bytes
+   `ifndef DWORD_SIZE_BYTES
    `define DWORD_SIZE_BYTES 4
+   `endif
    // Number of Word requests per cycle {1, 2, 4, 8, ...}
+   `ifndef DNUMBER_REQUESTS
    `define DNUMBER_REQUESTS `NT
+   `endif
    // Number of cycles to complete stage 1 (read from memory)
-   `define DSTAGE_1_CYCLES 1
+   `ifndef DSTAGE_1_CYCLES
+   `define DSTAGE_1_CYCLES 2
+   `endif
    // Function ID
+   `ifndef DFUNC_ID
    `define DFUNC_ID 0
+   `endif
 
    // Bank Number of words in a line
+   `ifndef DBANK_LINE_SIZE_WORDS
    `define DBANK_LINE_SIZE_WORDS (`DBANK_LINE_SIZE_BYTES / `DWORD_SIZE_BYTES)
+   `endif
+   `ifndef DBANK_LINE_SIZE_RNG
    `define DBANK_LINE_SIZE_RNG `DBANK_LINE_SIZE_WORDS-1:0
+   `endif
 // Queues feeding into banks Knobs {1, 2, 4, 8, ...}
 
    // Core Request Queue Size
+   `ifndef DREQQ_SIZE
    `define DREQQ_SIZE `NW
+   `endif
    // Miss Reserv Queue Knob
+   `ifndef DMRVQ_SIZE
    `define DMRVQ_SIZE (`NW*`NT)
+   `endif
    // Dram Fill Rsp Queue Size
+   `ifndef DDFPQ_SIZE
    `define DDFPQ_SIZE 2
+   `endif
    // Snoop Req Queue
+   `ifndef DSNRQ_SIZE
    `define DSNRQ_SIZE 8
+   `endif
 
 // Queues for writebacks Knobs {1, 2, 4, 8, ...}
    // Core Writeback Queue Size
+   `ifndef DCWBQ_SIZE
    `define DCWBQ_SIZE `DREQQ_SIZE
+   `endif
    // Dram Writeback Queue Size
+   `ifndef DDWBQ_SIZE
    `define DDWBQ_SIZE 4
+   `endif
    // Dram Fill Req Queue Size
+   `ifndef DDFQQ_SIZE
    `define DDFQQ_SIZE `DREQQ_SIZE
+   `endif
    // Lower Level Cache Hit Queue Size
+   `ifndef DLLVQ_SIZE
    `define DLLVQ_SIZE 0
+   `endif
    // Fill Forward SNP Queue
+   `ifndef DFFSQ_SIZE
    `define DFFSQ_SIZE 8
+   `endif
 
   // Fill Invalidator Size {Fill invalidator must be active}
-  `define DFILL_INVALIDAOR_SIZE 0
+  `ifndef DFILL_INVALIDAOR_SIZE
+  `define DFILL_INVALIDAOR_SIZE 16
+  `endif
 
 // Dram knobs
+   `ifndef DSIMULATED_DRAM_LATENCY_CYCLES
    `define DSIMULATED_DRAM_LATENCY_CYCLES 10
+   `endif
 
 // ========================================= Dcache Configurable Knobs =========================================
 
@@ -185,50 +249,92 @@
 // ========================================= Icache Configurable Knobs =========================================
 
 // General Cache Knobs
+   // Size of cache in bytes
+   `ifndef ICACHE_SIZE_BYTES
+   `define ICACHE_SIZE_BYTES 1024
+   `endif
    // Size of line inside a bank in bytes
+   `ifndef IBANK_LINE_SIZE_BYTES
    `define IBANK_LINE_SIZE_BYTES `GLOBAL_BLOCK_SIZE_BYTES
+   `endif
    // Number of banks {1, 2, 4, 8,...}
+   `ifndef INUMBER_BANKS
    `define INUMBER_BANKS 8
+   `endif
    // Size of a word in bytes
+   `ifndef IWORD_SIZE_BYTES
    `define IWORD_SIZE_BYTES 4
+   `endif
    // Number of Word requests per cycle {1, 2, 4, 8, ...}
+   `ifndef INUMBER_REQUESTS
    `define INUMBER_REQUESTS 1
+   `endif
    // Number of cycles to complete stage 1 (read from memory)
-   `define ISTAGE_1_CYCLES 1
+   `ifndef ISTAGE_1_CYCLES
+   `define ISTAGE_1_CYCLES 2
+   `endif
    // Function ID
+   `ifndef IFUNC_ID
    `define IFUNC_ID 1
+   `endif
 
    // Bank Number of words in a line
+   `ifndef IBANK_LINE_SIZE_WORDS
    `define IBANK_LINE_SIZE_WORDS (`IBANK_LINE_SIZE_BYTES / `IWORD_SIZE_BYTES)
+   `endif
+   `ifndef IBANK_LINE_SIZE_RNG
    `define IBANK_LINE_SIZE_RNG `IBANK_LINE_SIZE_WORDS-1:0
+   `endif
 // Queues feeding into banks Knobs {1, 2, 4, 8, ...}
 
    // Core Request Queue Size
+   `ifndef IREQQ_SIZE
    `define IREQQ_SIZE `NW
+   `endif
    // Miss Reserv Queue Knob
+   `ifndef IMRVQ_SIZE
    `define IMRVQ_SIZE `IREQQ_SIZE
+   `endif
    // Dram Fill Rsp Queue Size
+   `ifndef IDFPQ_SIZE
    `define IDFPQ_SIZE 2
+   `endif
    // Snoop Req Queue
+   `ifndef ISNRQ_SIZE
    `define ISNRQ_SIZE 8
+   `endif
 
 // Queues for writebacks Knobs {1, 2, 4, 8, ...}
    // Core Writeback Queue Size
+   `ifndef ICWBQ_SIZE
    `define ICWBQ_SIZE `IREQQ_SIZE
+   `endif
    // Dram Writeback Queue Size
-   `define IDWBQ_SIZE 16
+   `ifndef IDWBQ_SIZE
+   `define IDWBQ_SIZE 0
+   `endif
    // Dram Fill Req Queue Size
+   `ifndef IDFQQ_SIZE
    `define IDFQQ_SIZE `IREQQ_SIZE
+   `endif
    // Lower Level Cache Hit Queue Size
-   `define ILLVQ_SIZE 16
+   `ifndef ILLVQ_SIZE
+   `define ILLVQ_SIZE 0
+   `endif
    // Fill Forward SNP Queue
+   `ifndef IFFSQ_SIZE
    `define IFFSQ_SIZE 8
+   `endif
 
   // Fill Invalidator Size {Fill invalidator must be active}
-  `define IFILL_INVALIDAOR_SIZE 0
+  `ifndef IFILL_INVALIDAOR_SIZE
+  `define IFILL_INVALIDAOR_SIZE 16
+  `endif
 
 // Dram knobs
+   `ifndef ISIMULATED_DRAM_LATENCY_CYCLES
    `define ISIMULATED_DRAM_LATENCY_CYCLES 10
+   `endif
 
 // ========================================= Icache Configurable Knobs =========================================
 
@@ -236,51 +342,91 @@
 
 // General Cache Knobs
    // Size of cache in bytes
+   `ifndef SCACHE_SIZE_BYTES
    `define SCACHE_SIZE_BYTES 1024
+   `endif
    // Size of line inside a bank in bytes
+   `ifndef SBANK_LINE_SIZE_BYTES
    `define SBANK_LINE_SIZE_BYTES `GLOBAL_BLOCK_SIZE_BYTES
+   `endif
    // Number of banks {1, 2, 4, 8,...}
+   `ifndef SNUMBER_BANKS
    `define SNUMBER_BANKS 8
+   `endif
    // Size of a word in bytes
+   `ifndef SWORD_SIZE_BYTES
    `define SWORD_SIZE_BYTES 4
+   `endif
    // Number of Word requests per cycle {1, 2, 4, 8, ...}
+   `ifndef SNUMBER_REQUESTS
    `define SNUMBER_REQUESTS `NT
+   `endif
    // Number of cycles to complete stage 1 (read from memory)
-   `define SSTAGE_1_CYCLES 1
+   `ifndef SSTAGE_1_CYCLES
+   `define SSTAGE_1_CYCLES 2
+   `endif
    // Function ID
+   `ifndef SFUNC_ID
    `define SFUNC_ID 2
+   `endif
 
    // Bank Number of words in a line
+   `ifndef SBANK_LINE_SIZE_WORDS
    `define SBANK_LINE_SIZE_WORDS (`SBANK_LINE_SIZE_BYTES / `SWORD_SIZE_BYTES)
+   `endif
+   `ifndef SBANK_LINE_SIZE_RNG
    `define SBANK_LINE_SIZE_RNG `SBANK_LINE_SIZE_WORDS-1:0
+   `endif
 // Queues feeding into banks Knobs {1, 2, 4, 8, ...}
 
    // Core Request Queue Size
+   `ifndef SREQQ_SIZE
    `define SREQQ_SIZE `NW
+   `endif
    // Miss Reserv Queue Knob
+   `ifndef SMRVQ_SIZE
    `define SMRVQ_SIZE `SREQQ_SIZE
+   `endif
    // Dram Fill Rsp Queue Size
-   `define SDFPQ_SIZE 16
+   `ifndef SDFPQ_SIZE
+   `define SDFPQ_SIZE 0
+   `endif
    // Snoop Req Queue
-   `define SSNRQ_SIZE 16
+   `ifndef SSNRQ_SIZE
+   `define SSNRQ_SIZE 0
+   `endif
 
 // Queues for writebacks Knobs {1, 2, 4, 8, ...}
    // Core Writeback Queue Size
+   `ifndef SCWBQ_SIZE
    `define SCWBQ_SIZE `SREQQ_SIZE
+   `endif
    // Dram Writeback Queue Size
-   `define SDWBQ_SIZE 16
+   `ifndef SDWBQ_SIZE
+   `define SDWBQ_SIZE 0
+   `endif
    // Dram Fill Req Queue Size
-   `define SDFQQ_SIZE 16
+   `ifndef SDFQQ_SIZE
+   `define SDFQQ_SIZE 0
+   `endif
    // Lower Level Cache Hit Queue Size
-   `define SLLVQ_SIZE 16
+   `ifndef SLLVQ_SIZE
+   `define SLLVQ_SIZE 0
+   `endif
    // Fill Forward SNP Queue
-   `define SFFSQ_SIZE 16
+   `ifndef SFFSQ_SIZE
+   `define SFFSQ_SIZE 0
+   `endif
 
   // Fill Invalidator Size {Fill invalidator must be active}
-  `define SFILL_INVALIDAOR_SIZE 0
+  `ifndef SFILL_INVALIDAOR_SIZE
+  `define SFILL_INVALIDAOR_SIZE 16
+  `endif
 
 // Dram knobs
+   `ifndef SSIMULATED_DRAM_LATENCY_CYCLES
    `define SSIMULATED_DRAM_LATENCY_CYCLES 10
+   `endif
 
 // ========================================= SM Configurable Knobs =========================================
 
@@ -289,50 +435,90 @@
 // ========================================= L2cache Configurable Knobs =========================================
 
 // General Cache Knobs
+   // Size of cache in bytes
+   `ifndef LLCACHE_SIZE_BYTES
+   `define LLCACHE_SIZE_BYTES 1024
+   `endif
    // Size of line inside a bank in bytes
+   `ifndef LLBANK_LINE_SIZE_BYTES
    `define LLBANK_LINE_SIZE_BYTES `GLOBAL_BLOCK_SIZE_BYTES
+   `endif
    // Number of banks {1, 2, 4, 8,...}
+   `ifndef LLNUMBER_BANKS
    `define LLNUMBER_BANKS 8
+   `endif
    // Size of a word in bytes
+   `ifndef LLWORD_SIZE_BYTES
    `define LLWORD_SIZE_BYTES (`LLBANK_LINE_SIZE_BYTES)
+   `endif
    // Number of Word requests per cycle {1, 2, 4, 8, ...}
+   `ifndef LLNUMBER_REQUESTS
    `define LLNUMBER_REQUESTS (2*`NUMBER_CORES_PER_CLUSTER)
+   `endif
    // Number of cycles to complete stage 1 (read from memory)
-   `define LLSTAGE_1_CYCLES 1
+   `ifndef LLSTAGE_1_CYCLES
+   `define LLSTAGE_1_CYCLES 2
+   `endif
    // Function ID
    `define LLFUNC_ID 3
 
    // Bank Number of words in a line
+   `ifndef LLBANK_LINE_SIZE_WORDS
    `define LLBANK_LINE_SIZE_WORDS (`LLBANK_LINE_SIZE_BYTES / `LLWORD_SIZE_BYTES)
+   `endif
+   `ifndef LLBANK_LINE_SIZE_RNG
    `define LLBANK_LINE_SIZE_RNG `LLBANK_LINE_SIZE_WORDS-1:0
+   `endif
 // Queues feeding into banks Knobs {1, 2, 4, 8, ...}
 
    // Core Request Queue Size
+   `ifndef LLREQQ_SIZE
    `define LLREQQ_SIZE (2*`NUMBER_CORES_PER_CLUSTER)
+   `endif
    // Miss Reserv Queue Knob
+   `ifndef LLMRVQ_SIZE
    `define LLMRVQ_SIZE (`DNUMBER_BANKS*`NUMBER_CORES_PER_CLUSTER)
+   `endif
    // Dram Fill Rsp Queue Size
+   `ifndef LLDFPQ_SIZE
    `define LLDFPQ_SIZE 2
+   `endif
    // Snoop Req Queue
+   `ifndef LLSNRQ_SIZE
    `define LLSNRQ_SIZE 8
+   `endif
 
 // Queues for writebacks Knobs {1, 2, 4, 8, ...}
    // Core Writeback Queue Size
+   `ifndef LLCWBQ_SIZE
    `define LLCWBQ_SIZE `LLREQQ_SIZE
+   `endif
    // Dram Writeback Queue Size
+   `ifndef LLDWBQ_SIZE
    `define LLDWBQ_SIZE 4
+   `endif
    // Dram Fill Req Queue Size
+   `ifndef LLDFQQ_SIZE
    `define LLDFQQ_SIZE `LLREQQ_SIZE
+   `endif
    // Lower Level Cache Hit Queue Size
-   `define LLLLVQ_SIZE 16
+   `ifndef LLLLVQ_SIZE
+   `define LLLLVQ_SIZE 0
+   `endif
    // Fill Forward SNP Queue
+   `ifndef LLFFSQ_SIZE
    `define LLFFSQ_SIZE 8
+   `endif
 
   // Fill Invalidator Size {Fill invalidator must be active}
-  `define LLFILL_INVALIDAOR_SIZE 0
+  `ifndef LLFILL_INVALIDAOR_SIZE
+  `define LLFILL_INVALIDAOR_SIZE 16
+  `endif
 
 // Dram knobs
+   `ifndef LLSIMULATED_DRAM_LATENCY_CYCLES
    `define LLSIMULATED_DRAM_LATENCY_CYCLES 10
+   `endif
 
 // ========================================= L2cache Configurable Knobs =========================================
 
@@ -340,51 +526,89 @@
 // ========================================= L3cache Configurable Knobs =========================================
 // General Cache Knobs
    // Size of cache in bytes
+   `ifndef L3CACHE_SIZE_BYTES
    `define L3CACHE_SIZE_BYTES 1024
+   `endif
    // Size of line inside a bank in bytes
+   `ifndef L3BANK_LINE_SIZE_BYTES
    `define L3BANK_LINE_SIZE_BYTES `GLOBAL_BLOCK_SIZE_BYTES
+   `endif
    // Number of banks {1, 2, 4, 8,...}
+   `ifndef L3NUMBER_BANKS
    `define L3NUMBER_BANKS 8
+   `endif
    // Size of a word in bytes
+   `ifndef L3WORD_SIZE_BYTES
    `define L3WORD_SIZE_BYTES (`L3BANK_LINE_SIZE_BYTES)
+   `endif
    // Number of Word requests per cycle {1, 2, 4, 8, ...}
+   `ifndef L3NUMBER_REQUESTS
    `define L3NUMBER_REQUESTS (`NUMBER_CLUSTERS)
+   `endif
    // Number of cycles to complete stage 1 (read from memory)
-   `define L3STAGE_1_CYCLES 1
+   `ifndef L3STAGE_1_CYCLES
+   `define L3STAGE_1_CYCLES 2
+   `endif
    // Function ID
    `define L3FUNC_ID 3
 
    // Bank Number of words in a line
+   `ifndef L3BANK_LINE_SIZE_WORDS
    `define L3BANK_LINE_SIZE_WORDS (`L3BANK_LINE_SIZE_BYTES / `L3WORD_SIZE_BYTES)
+   `endif
+   `ifndef L3BANK_LINE_SIZE_RNG
    `define L3BANK_LINE_SIZE_RNG `L3BANK_LINE_SIZE_WORDS-1:0
+   `endif
 // Queues feeding into banks Knobs {1, 2, 4, 8, ...}
 
    // Core Request Queue Size
+   `ifndef L3REQQ_SIZE
    `define L3REQQ_SIZE (`NT*`NW*`NUMBER_CLUSTERS)
+   `endif
    // Miss Reserv Queue Knob
+   `ifndef L3MRVQ_SIZE
    `define L3MRVQ_SIZE `LLREQQ_SIZE
+   `endif
    // Dram Fill Rsp Queue Size
+   `ifndef L3DFPQ_SIZE
    `define L3DFPQ_SIZE 2
+   `endif
    // Snoop Req Queue
+   `ifndef L3SNRQ_SIZE
    `define L3SNRQ_SIZE 8
+   `endif
 
 // Queues for writebacks Knobs {1, 2, 4, 8, ...}
    // Core Writeback Queue Size
+   `ifndef L3CWBQ_SIZE
    `define L3CWBQ_SIZE `L3REQQ_SIZE
+   `endif
    // Dram Writeback Queue Size
+   `ifndef L3DWBQ_SIZE
    `define L3DWBQ_SIZE 4
+   `endif
    // Dram Fill Req Queue Size
+   `ifndef L3DFQQ_SIZE
    `define L3DFQQ_SIZE `L3REQQ_SIZE
+   `endif
    // Lower Level Cache Hit Queue Size
+   `ifndef L3LLVQ_SIZE
    `define L3LLVQ_SIZE 0
+   `endif
    // Fill Forward SNP Queue
+   `ifndef L3FFSQ_SIZE
    `define L3FFSQ_SIZE 8
+   `endif
 
   // Fill Invalidator Size {Fill invalidator must be active}
-  `define L3FILL_INVALIDAOR_SIZE 0
+  `ifndef L3FILL_INVALIDAOR_SIZE
+  `define L3FILL_INVALIDAOR_SIZE 16
+  `endif
 
 // Dram knobs
+   `ifndef L3SIMULATED_DRAM_LATENCY_CYCLES
    `define L3SIMULATED_DRAM_LATENCY_CYCLES 10
+   `endif
 
 // ========================================= L3cache Configurable Knobs =========================================
 
diff --git a/rtl/VX_define_synth.v b/rtl/VX_define_synth.v
deleted file mode 100644
index 79d1a1582..000000000
--- a/rtl/VX_define_synth.v
+++ /dev/null
@@ -1,20 +0,0 @@
-
-`ifndef VX_DEFINE_SYNTH
-`define VX_DEFINE_SYNTH
-
-`define NT 8
-`define NW 8
-`define NUMBER_CORES_PER_CLUSTER 1
-`define NUMBER_CLUSTERS 1
-`define DCACHE_SIZE_BYTES 4096
-`define ICACHE_SIZE_BYTES 1024
-
-// L2 Cache size
-`define LLCACHE_SIZE_BYTES 8192
-
-// `define QUEUE_FORCE_MLAB 1
-
-// Use l3 cache (required for cluster behavior)
-// `define L3C 1
-
-`endif
diff --git a/rtl/gen_config.py b/rtl/gen_config.py
new file mode 100755
index 000000000..5835fbacd
--- /dev/null
+++ b/rtl/gen_config.py
@@ -0,0 +1,139 @@
+#!/usr/bin/env python3
+# coding=utf-8
+from __future__ import print_function
+
+import os
+import os.path as path
+import re
+import argparse
+from datetime import datetime
+
+rtl_root = path.dirname(path.realpath(__file__))
+
+defines = {}
+for k, v in os.environ.items():
+    if k.upper().startswith('V_'):
+        defines[k[2:]] = v
+
+print('Custom params:', ', '.join(['='.join(x) for x in defines.items()]))
+
+parser = argparse.ArgumentParser()
+parser.add_argument('--outc', default='none', help='Output C header')
+parser.add_argument('--outv', default='none', help='Output Verilog header')
+parser.add_argument('--rtl_locations', action='store_true', help='use outc and outv for rtl and rtl/simulate')
+
+args = parser.parse_args()
+
+if args.rtl_locations:
+    args.outc = path.join(rtl_root, 'simulate/VX_define.h')
+    args.outv = path.join(rtl_root, 'VX_define_synth.v')
+
+if args.outc == 'none' and args.outv == 'none':
+    print('Warning: not emitting any files. Specify arguments')
+
+if args.outv != 'none':
+    with open(args.outv, 'w') as f:
+        print('''
+// auto-generated by gen_config.py. DO NOT EDIT
+// Generated at {date}
+
+`ifndef VX_DEFINE_SYNTH
+`define VX_DEFINE_SYNTH
+'''[1:].format(date=datetime.now()), file=f)
+
+        for k, v in defines.items():
+            print('`define {} {}'.format(k, v), file=f)
+
+        print('\n`endif', file=f)
+
+if args.outc != 'none':
+    with open(args.outc, 'w') as f:
+        print('''
+// auto-generated by gen_config.py. DO NOT EDIT
+// Generated at {date}
+
+#ifndef VX_DEFINE_SYNTH
+#define VX_DEFINE_SYNTH
+'''[1:].format(date=datetime.now()), file=f)
+
+        for k, v in defines.items():
+            print('#define {} {}'.format(k, v), file=f)
+
+        print('\n#endif', file=f)
+
+translation_rules = [
+    (re.compile(r'^$'), r''),
+    (re.compile(r'^( *)`ifndef ([^ ]+)$'), r'\1#ifndef \2'),
+    (re.compile(r'^( *)`define ([^ ]+)$'), r'\1#define \2'),
+    # (re.compile(r'^( *)`include "\./VX_define_synth\.v"$'), r'\1#include "VX_define_synth.h"'),
+    (re.compile(r'^( *)`include "\./VX_define_synth\.v"$'), r''),
+    (re.compile(r'^( *)`define ([^ ]+) (.+)$'), r'\1#define \2 \3'),
+    (re.compile(r'^( *)`endif$'), r'\1#endif'),
+    (re.compile(r'^( *)// (.*)$'), r'\1// \2'),
+]
+
+post_rules = [
+    (re.compile(r"\d+'d(\d+)"), r'\1'),
+
+    # non-standard C but supported by GCC and Clang
+    (re.compile(r"\d+'b([01]+)"), r'0b\1'),
+    (re.compile(r"\d+'h([\da-fA-F]+)"), r'0x\1'),
+
+    # fix macro references (does not support escaped identifiers §5.6.1)
+    (re.compile(r"`([A-Za-z_][$_0-9A-Za-z]*)"), r'\1'),
+]
+
+
+def post_process_line(line):
+    for pat, repl in post_rules:
+        line = pat.sub(repl, line)
+    return line
+
+
+in_expansion = False
+
+if args.outc != 'none':
+    with open(args.outc, 'a') as f:
+        print('''
+// auto-generated by gen_config.py. DO NOT EDIT
+// Generated at {date}
+
+// Translated from VX_define.v:
+'''[1:].format(date=datetime.now()), file=f)
+        with open(path.join(rtl_root, 'VX_define.v'), 'r') as r:
+            for line in r:
+                if in_expansion:
+                    f.write(post_process_line(line))
+                    if not line.strip().endswith('\\'):
+                        in_expansion = False
+                else:
+                    for pat, repl in translation_rules:
+                        if pat.match(line):
+                            if line.strip().endswith('\\'):
+                                in_expansion = True
+                            f.write(post_process_line(pat.sub(repl, line)))
+                            break
+                    else:
+                        raise ValueError('failed to find rule for: ' + line)
+
+        print('''
+// Misc
+
+#define THREADS_PER_WARP NT
+#define WARPS_PER_CORE NW
+#define NUMBER_WI (NW * NT * NUMBER_CORES_PER_CLUSTER * NUMBER_CLUSTERS)
+
+// legacy
+#define TOTAL_THREADS NUMBER_WI
+#define TOTAL_WARPS (NW * NUMBER_CORES_PER_CLUSTER * NUMBER_CLUSTERS)
+
+
+
+// COLORS
+#define GREEN "\\033[32m"
+#define RED "\\033[31m"
+#define DEFAULT "\\033[39m"
+'''[1:], file=f)
+
+
+
diff --git a/rtl/simulate/VX_define.h b/rtl/simulate/VX_define.h
deleted file mode 100644
index ed10c77fc..000000000
--- a/rtl/simulate/VX_define.h
+++ /dev/null
@@ -1,100 +0,0 @@
-#define NT 4
-#define NT_M1 (NT-1)
-
-#define NW 8
-
-#define CACHE_NUM_BANKS 8
-#define CACHE_WORDS_PER_BLOCK 4
-
-#define R_INST 51
-#define L_INST 3
-#define ALU_INST 19
-#define S_INST 35
-#define B_INST 99
-#define LUI_INST 55
-#define AUIPC_INST 23
-#define JAL_INST 111
-#define JALR_INST 103
-#define SYS_INST 115
-
-
-#define WB_ALU 1
-#define WB_MEM 2
-#define WB_JAL 3
-#define NO_WB  0
-
-
-#define RS2_IMMED 1
-#define RS2_REG 0
-
-
-#define NO_MEM_READ  7
-#define LB_MEM_READ  0
-#define LH_MEM_READ  1
-#define LW_MEM_READ  2
-#define LBU_MEM_READ 4
-#define LHU_MEM_READ 5
-
-
-#define NO_MEM_WRITE 7
-#define SB_MEM_WRITE 0
-#define SH_MEM_WRITE 1
-#define SW_MEM_WRITE 2
-
-
-#define NO_BRANCH 0
-#define BEQ 1
-#define BNE 2
-#define BLT 3
-#define BGT 4
-#define BLTU 5
-#define BGTU 6
-
-
-#define NO_ALU 15
-#define ADD 0
-#define SUB 1
-#define SLLA 2
-#define SLT 3
-#define SLTU 4
-#define XOR 5
-#define SRL 6
-#define SRA 7
-#define OR 8
-#define AND 9
-#define SUBU 10
-#define LUI_ALU 11
-#define AUIPC_ALU 12
-#define CSR_ALU_RW 13
-#define CSR_ALU_RS 14
-#define CSR_ALU_RC 15
-
-
-
-// WRITEBACK
-#define WB_ALU 1
-#define WB_MEM 2
-#define WB_JAL 3
-#define NO_WB  0
-
-
-// JAL
-#define JUMP 1
-#define NO_JUMP 0
-
-// STALLS
-#define STALL 1
-#define NO_STALL 0
-
-
-#define TAKEN 1
-#define NOT_TAKEN 0
-
-
-#define ZERO_REG 0
-
-
-// COLORS
-#define GREEN "\033[32m"
-#define RED "\033[31m"
-#define DEFAULT "\033[39m"
diff --git a/runtime/.gitignore b/runtime/.gitignore
new file mode 100644
index 000000000..18e58a752
--- /dev/null
+++ b/runtime/.gitignore
@@ -0,0 +1 @@
+/config.h
diff --git a/runtime/Makefile b/runtime/Makefile
new file mode 100644
index 000000000..2a6bdb37e
--- /dev/null
+++ b/runtime/Makefile
@@ -0,0 +1,6 @@
+
+.PHONY: build_config
+build_config:
+	../rtl/gen_config.py --outv none --outc ./config.h
+
+
diff --git a/runtime/config.h b/runtime/config.h
deleted file mode 100644
index 304cca893..000000000
--- a/runtime/config.h
+++ /dev/null
@@ -1,2 +0,0 @@
-#define TOTAL_THREADS 4
-#define TOTAL_WARPS 4