.. _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`
