Looks like I found a bug in the csr_field type_cache. It was barfing if a different design was passed to it which seems bizzare since it goes out of its way to support having a different type for different designs. So, I modified it to work like the type cache in ast and do what I think it wanted to do in the first place.

Author: james-ball-qualcomm

.vscode/launch.json

@@ -19,6 +19,15 @@
       "args": [],
       "askParameters": false
     },
+    {
+      "type": "rdbg",
+      "name": "portfolios",
+      "request": "launch",
+      "command": "bundle exec rake",
+      "script": "portfolios",
+      "args": [],
+      "askParameters": false
+    },
     {
       "type": "rdbg",
       "name": "RVA20",

lib/arch_obj_models/csr_field.rb

@@ -27,6 +27,7 @@ def initialize(parent_csr, field_name, field_data)
     super(field_data, parent_csr.data_path, parent_csr.arch)
     @name = field_name
     @parent = parent_csr
+    @type_cache = {}
   end
 
   # @param possible_xlens [Array<Integer>] List of xlens that be used in any implemented mode
@@ -161,11 +162,7 @@ def pruned_type_ast(symtab)
   def type(symtab)
     raise ArgumentError, "Argument 1 should be a symtab" unless symtab.is_a?(Idl::SymbolTable)
 
-    unless @type_cache.nil?
-      raise "Different design for type #{@type_cache.keys},  #{symtab.design}" unless @type_cache.key?(symtab.design)
-
-      return @type_cache[symtab.design]
-    end
+    return @type_cache[symtab.design] if @type_cache.key?(symtab.design)
 
     type =
       if @data.key?("type")
@@ -210,7 +207,6 @@ def type(symtab)
         # end
       end
 
-    @type_cache ||= {}
     @type_cache[symtab.design] = type
   end