skiboot v7.0 release notes

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
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+.. _skiboot-7.0:
+
+skiboot-7.0
+===========
+
+skiboot v7.0 was released on Tuesday Oct 26th 2021. It is the first release
+of skiboot 7.0 series, which becomes the new stable release following the
+:ref:`skiboot-6.8` release, first released Friday May 28th 2021.
+
+This release contains all required feature to support POWER10 systems. This
+shoule be considered as minimal skiboot version required for POWER10 systems.
+
+New Features
+------------
+POWER10
+^^^^^^^
+Below is the list of major feature apart from base POWER10 enablement related
+changes.
+
+- Denali and rainier platform support
+
+- XIVE2 interrupt controller support
+
+- PHB5 support
+
+- Support for OpenCAPI Persistent Memory devices
+
+- Power management stop states and PState (OCC) support