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+.. _skiboot-4.0:
+
+===========
+skiboot 4.0
+===========
+
+Skiboot 4.0 was released 19th November 2014. It was the first release to obtain
+an independent version number and numbering scheme. Previous releases were
+identified either purely by a GIT SHA1 hash or the associated PowerKVM release
+number.
+
+This release introduced the following OPAL calls:
+
+ - :ref:`OPAL_IPMI_SEND`
+ - :ref:`OPAL_IPMI_RECV`
+ - :ref:`OPAL_I2C_REQUEST`