update some description
@@ -3,7 +3,24 @@ Intersection has two methods and are implemented in two Actions.
One is in hw_h (hash, -m1) and one is in hw_s (sort, -m2).
# Important
-before make config under hardware directory,
-You need to create a symbolic link "hw" points to either "hw_s" or "hw_h"
-depending on the method you want to test.
+
+To select the action HW method, you must config it first, by
+
+```
+make -C snap clean
+make -C $ACTION_ROOT config_h
+```
+
+.or.
+
+```
+make -C snap clean
+make -C $ACTION_ROOT config_s
+```
+
+Then follow the usual flow.
+```
+make -C snap/hardware config model
+make -C snap/hardware image
+```
