skiboot v6.6 release notesv6.6

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

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+.. _skiboot-6.6:
+
+skiboot-6.6
+===========
+
+skiboot v6.6 was released on Wednesday April 22nd 2020. It is the first release
+of skiboot 6.6 series, which becomes the new stable release following the
+:ref:`skiboot-6.5` release, first released August 16th 2019.
+
+There hasn't been a skiboot release in a while and this release doesn't contain
+a huge number of new features for users, just a lot of bug fixes, and additional
+platform support. The next release should be a little more lively with a number
+of internal refactorings and new features on the way.
+
+.. _skiboot-6.6-new-features:
+
+New features
+------------
+
+- Skiboot is now dual licensed as Apache 2.0 -OR- GPLv2+
+
+  There are some files still licensed Apache 2.0 only due to contributions
+  that we are unable to change the license of, but they are the minority.
+
+- Skiboot can now be built as little endian, thanks to Team Nick.
+
+  Doing so requires building with: make LITTLE_ENDIAN=1
+
+- OpenCAPI reset support
+  
+  This is to allow FPGA-based OpenCAPI devices to be re-flashed with a new
+  device image, then reset to activate the new image. Although it is based
+  on top of the existing PCI Hotplug support it does require some OS changes
+  to function.
+
+- The :ref:`OPAL_PHB_SET_OPTION` and :ref:`OPAL_PHB_GET_OPTION` OPAL calls
+
+  These OPAL calls provide the OS with a means for controlling per-PHB
+  settings. Currently this allows the OS to enable or disable the the "Global
+  MMIO EEH Disable" and "4GTE" settings which are available on Power9 / PHB4.
+  See the PHB specification for more details.
+
+Removed features
+----------------
+
+- Fast-reboot is now disabled by default.
+
+  Fast-reboot will continue to be supported, but as an opt-in feature rather
+  than the default. From the commit (ee07f2c68160) message::
+
+    This has two user visible changes:
+    
+    1. Full reboot is now the default. In order to get fast-reboot as the
+       default the nvram option needs to be set:
+    
+            nvram -p ibm,skiboot --update-config fast-reset=1
+    
+    2. The nvram option to force a fast-reboot even when some part of
+       skiboot has called disable_fast_reboot() has changed from
+       'fast-reset=im-feeling-lucky' to 'force-fast-reset=1' because
+       it's impossible to actually use that 'feature' if fast-reboot is
+       off by default.
+    
+            nvram -p ibm,skiboot --update-config force-fast-reset=1
+