diff --git a/minitests/roi_harness/create_design_json.py b/minitests/roi_harness/create_design_json.py
new file mode 100644
index 00000000..3c7360a5
--- /dev/null
+++ b/minitests/roi_harness/create_design_json.py
@@ -0,0 +1,29 @@
+import json
+import csv
+import argparse
+import sys
+
+def main():
+    parser = argparse.ArgumentParser(description="Creates design.json from output of ROI generation tcl script.")
+    parser.add_argument('--design_txt', required=True)
+    parser.add_argument('--design_info_txt', required=True)
+
+    args = parser.parse_args()
+
+    j = {}
+    j['ports'] = []
+    j['info'] = {}
+    with open(args.design_txt) as f:
+        for d in csv.DictReader(f, delimiter=' '):
+            j['ports'].append(d)
+
+    with open(args.design_info_txt) as f:
+        for l in f:
+            name, value = l.strip().split(' = ')
+
+            j['info'][name] = int(value)
+
+    json.dump(j, sys.stdout, indent=2, sort_keys=True)
+
+if __name__ == '__main__':
+    main()
diff --git a/minitests/roi_harness/runme.sh b/minitests/roi_harness/runme.sh
index c5da2a4e..8ec24515 100755
--- a/minitests/roi_harness/runme.sh
+++ b/minitests/roi_harness/runme.sh
@@ -24,7 +24,7 @@ EOF
 stat ${XRAY_DIR}/database/artix7/${XRAY_PART}.yaml >/dev/null
 
 # 6x by 18y CLBs (108)
-if [ $SMALL = Y ] ; then
+if [ "$SMALL" = Y ] ; then
     echo "Design: small"
     export PITCH=1
     export DIN_N=8
@@ -37,6 +37,7 @@ else
     export DIN_N=8
     export DOUT_N=8
     export XRAY_ROI=SLICE_X12Y100:SLICE_X27Y149
+    #export XRAY_ROI=SLICE_X12Y100:SLICE_X5Y149
 fi
 
 mkdir -p $BUILD_DIR
@@ -59,6 +60,8 @@ ${XRAY_BITREAD} -F $XRAY_ROI_FRAMES -o design.bits -z -y design.bit
 ${XRAY_SEGPRINT} -zd design.bits >design.segp
 ${XRAY_DIR}/utils/bits2fasm.py --verbose design.bits > design.fasm
 ${XRAY_DIR}/utils/fasm2frames.py design.fasm design.frm
+python3 ../create_design_json.py --design_info_txt design_info.txt --design_txt design.txt > design.json
+
 # Hack to get around weird clock error related to clk net not found
 # Remove following lines:
 #set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets clk_IBUF]
diff --git a/minitests/roi_harness/runme.tcl b/minitests/roi_harness/runme.tcl
index 06ae5023..c2bd9795 100644
--- a/minitests/roi_harness/runme.tcl
+++ b/minitests/roi_harness/runme.tcl
@@ -360,6 +360,48 @@ proc node2wire {node} {
     return $wire
 }
 
+proc write_grid_roi {fp} {
+    foreach {slices} [split "$::env(XRAY_ROI)" " "] {
+        foreach site_name [split "$slices" :] {
+            set site [get_sites $site_name]
+            set tile [get_tiles -of_objects $site]
+            lappend grid_xs [get_property GRID_POINT_X $tile]
+            lappend grid_ys [get_property GRID_POINT_Y $tile]
+        }
+    }
+
+    set grid_x_min [lindex $grid_xs 0]
+    set grid_x_max [lindex $grid_xs 0]
+    set grid_y_min [lindex $grid_ys 0]
+    set grid_y_max [lindex $grid_ys 0]
+
+    foreach {grid_x} $grid_xs {
+        if {$grid_x > $grid_x_max} {
+            set grid_x_max $grid_x
+        }
+        if {$grid_x < $grid_x_min} {
+            set grid_x_min $grid_x
+        }
+    }
+    foreach {grid_y} $grid_ys {
+        if {$grid_y > $grid_y_max} {
+            set grid_y_max $grid_y
+        }
+        if {$grid_y < $grid_x_min} {
+            set grid_y_min $grid_y
+        }
+    }
+
+    puts $fp "GRID_X_MIN = $grid_x_min"
+    puts $fp "GRID_X_MAX = $grid_x_max"
+    puts $fp "GRID_Y_MIN = $grid_y_min"
+    puts $fp "GRID_Y_MAX = $grid_y_max"
+}
+
+set fp [open "design_info.txt" w]
+write_grid_roi $fp
+close $fp
+
 # XXX: maybe add IOB?
 set fp [open "design.txt" w]
 puts $fp "name node pin wire"
diff --git a/prjxray/grid.py b/prjxray/grid.py
index 15b7c94d..3acde582 100644
--- a/prjxray/grid.py
+++ b/prjxray/grid.py
@@ -12,7 +12,7 @@ class BlockType(enum.Enum):
 
 
 GridLoc = namedtuple('GridLoc', 'grid_x grid_y')
-GridInfo = namedtuple('GridInfo', 'segment bits sites tile_type in_roi')
+GridInfo = namedtuple('GridInfo', 'segment bits sites tile_type')
 Bits = namedtuple('Bits', 'base_address frames offset words')
 BitsInfo = namedtuple('BitsInfo', 'segment_type tile bits')
 
@@ -43,11 +43,6 @@ class Grid(object):
             assert grid_loc not in self.loc
             self.loc[grid_loc] = tile
 
-            if 'in_roi' in tileinfo:
-                in_roi = tileinfo['in_roi']
-            else:
-                in_roi = True
-
             bits = {}
 
             if 'segment' in tileinfo:
@@ -72,7 +67,6 @@ class Grid(object):
                 bits=bits,
                 sites=tileinfo['sites'],
                 tile_type=tileinfo['type'],
-                in_roi=in_roi,
             )
 
         x, y = zip(*self.loc.keys())