skiboot 6.0.2 release notes

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

doc/release-notes/skiboot-6.0.2.rst

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+.. _skiboot-6.0.2:
+
+=============
+skiboot-6.0.2
+=============
+
+skiboot 6.0.2 was released on Friday May 18th, 2018. It replaces
+:ref:`skiboot-6.0.1` as the current stable release in the 6.0.x series.
+
+It is recommended that 6.0.2 be used instead of any previous 6.0.x version.
+
+Over :ref:`skiboot-6.0.1`, we one bug fix:
+
+- cpu: Clear PCR SPR in opal_reinit_cpus()
+
+  Currently if Linux boots with a non-zero PCR, things can go bad where
+  some early userspace programs can take illegal instructions. This is
+  being fixed in Linux, but in the mean time, we should cleanup in
+  skiboot also.
+
+  This could exhibit itself as petitboot getting killed with SIGILL and
+  no boot devices showing up, but only in a situation where you've done
+  a kdump from a kernel running a p8 compat guest