diff --git a/lpc_aspeed.hpp b/lpc_aspeed.hpp
index 9300efd..ac87c22 100644
--- a/lpc_aspeed.hpp
+++ b/lpc_aspeed.hpp
@@ -31,12 +31,13 @@
     LpcMapperAspeed(LpcMapperAspeed&&) = default;
     LpcMapperAspeed& operator=(LpcMapperAspeed&&) = default;
 
+    /* throws MapperException */
+    MemorySet open() override;
+
     void close() override;
 
-    std::pair<std::uint32_t, std::uint32_t>
-        mapWindow(std::uint32_t address, std::uint32_t length) override;
-
-    std::vector<std::uint8_t> copyFrom(std::uint32_t length) override;
+    WindowMapResult mapWindow(std::uint32_t address,
+                              std::uint32_t length) override;
 
     /**
      * Attempt to mmap the region.