skiboot 5.6.0-rc2 release notesskiboot-5.6.0-rc2

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

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+.. _skiboot-5.6.0-rc2:
+
+skiboot-5.6.0-rc2
+=================
+
+skiboot-5.6.0-rc2 was released on Friday May 19th 2017. It is the second
+release candidate of skiboot 5.6, which will become the new stable release
+of skiboot following the 5.5 release, first released April 7th 2017.
+
+skiboot-5.6.0-rc2 contains all bug fixes as of :ref:`skiboot-5.4.4`
+and :ref:`skiboot-5.1.19` (the currently maintained stable releases). We
+do not currently expect to do any 5.5.x stable releases.
+
+For how the skiboot stable releases work, see :ref:`stable-rules` for details.
+
+The current plan is to cut the final 5.6.0 by May 22nd, with skiboot 5.6.0
+being for all POWER8 and POWER9 platforms in op-build v1.17 (Due May 24th).
+This is a short cycle as this release is mainly targetted towards POWER9
+bringup efforts.
+
+With skiboot 5.6.0, we are moving to a regular six week release cycle,
+similar to op-build, but slightly offset to allow for a short stabilisation
+period. Expected release dates and contents are tracked using GitHub milestone
+and issues: https://github.com/open-power/skiboot/milestones
+
+Over :ref:`skiboot-5.6.0-rc1`, we have the following changes:
+
+- hw/i2c: Fix early lock drop
+
+  When interacting with an I2C master the p8-i2c driver (common to p9)
+  aquires a per-master lock which it holds for the duration of it's
+  interaction with the master.  Unfortunately, when
+  p8_i2c_check_initial_status() detects that the master is busy with
+  another transaction it drops the lock and returns OPAL_BUSY. This is
+  contrary to the driver's locking strategy which requires that the
+  caller aquire and drop the lock. This leads to a crash due to the
+  double unlock(), which skiboot treats as fatal.
+
+- mambo: Add skiboot/linux symbol lookup
+
+  Adds the skisym and linsym commands which can be used to find the
+  address of a Linux or Skiboot symbol. To function this requires
+  the user to provide the SKIBOOT_MAP and VMLINUX_MAP environmental
+  variables which indicate which skiboot.map and System.map files
+  should be used.
+
+  Examples:
+
+  - Look up a symbol address: ::
+
+            systemsim % skisym .load_and_boot_kernel
+            0x0000000030013a08
+
+  - Set a breakpoint there: ::
+
+            systemsim % b [skisym .load_and_boot_kernel]
+            breakpoint set at [0:0]: 0x0000000030013a08 (0x0000000030013A08) Enc:0x7D800026 : mfcr    r12
+
+
+- libstb: Fix build in OpenSSL 1.1
+
+  The build failure was as follows: ::
+
+    [ HOSTCC ] libstb/create-container.c
+    In file included from /usr/include/openssl/asn1.h:24:0,
+                     from /usr/include/openssl/ec.h:30,
+                     from libstb/create-container.c:36:
+    libstb/create-container.c: In function ‘getSigRaw’:
+    libstb/create-container.c:104:31: error: dereferencing pointer to incomplete
+                                      type ‘ECDSA_SIG {aka struct ECDSA_SIG_st}’
+      rlen = BN_num_bytes(signature->r);
+                                   ^