diff --git a/flash-ipmi.hpp b/flash-ipmi.hpp
new file mode 100644
index 0000000..43cafe1
--- /dev/null
+++ b/flash-ipmi.hpp
@@ -0,0 +1,57 @@
+#pragma once
+
+/*
+ * flashStartTransfer -- starts file upload.
+ * flashDataBlock -- adds data to image file.
+ * flashDataFinish -- closes the file.
+ *
+ * flashStartHash -- starts uploading hash.
+ * flashDataHash -- adds data to the hash.
+ * flashDataVerify -- triggers verification.
+ *
+ * flashAbort -- abort everything.
+ *
+ * flashVerifyCheck -- Check if the verification has completed.
+ *
+ * flashVersion -- Get the version of this OEM Handler.
+ *
+ * flashRequestRegion -- Request the physical address for decode (bridge)
+ * flashDataExtBlock -- Provide image data via a bridge
+ * flashHashExtData -- Provide hash data via a bridge
+ */
+enum FlashSubCmds
+{
+    /* Start a transfer. */
+    flashStartTransfer = 0,
+    /* Data block. */
+    flashDataBlock = 1,
+    /* Close file. */
+    flashDataFinish = 2,
+
+    /* Start a hash transfer. */
+    flashStartHash = 3,
+    /* Add data to the hash. */
+    flashHashData = 4,
+    /* Close out the hash file. */
+    flashHashFinish = 5,
+
+    /* Verify the flash image against the hast sent. */
+    flashDataVerify = 6,
+
+    /* Abort. */
+    flashAbort = 7,
+
+    /*
+     * Check if the verification is ready and was successful.
+     * If the response from the IPMI command is OK, check the
+     * response bytes to know if it's ready or still computing,
+     * or failed.
+     */
+    flashVerifyCheck = 8,
+
+    flashVersion = 9,
+    flashRequestRegion = 10,
+    flashDataExtBlock = 11,
+    flashHashExtData = 12,
+    flashMapRegionLpc = 13,
+};
diff --git a/main.cpp b/main.cpp
index 36f4662..8a6bac1 100644
--- a/main.cpp
+++ b/main.cpp
@@ -17,6 +17,8 @@
 #include "host-ipmid/ipmid-api.h"
 #include "host-ipmid/oemrouter.hpp"
 
+#include "flash-ipmi.hpp"
+
 /* TODO: Once OEM IPMI number placement is settled, point to that. */
 namespace oem
 {