Add skiboot-5.1.12 release notes
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/doc/release-notes/skiboot-5.1.12.txt b/doc/release-notes/skiboot-5.1.12.txt
new file mode 100644
index 0000000..6368473
--- /dev/null
+++ b/doc/release-notes/skiboot-5.1.12.txt
@@ -0,0 +1,44 @@
+skiboot-5.1.12
+--------------
+
+skiboot-5.1.12 was released on Friday December 4th, 2015.
+
+skiboot-5.1.12 is the 13th stable release of 5.1, it follows skiboot-5.1.11
+(which was released November 13th, 2015).
+
+Skiboot 5.1.12 contains bug fixes and a performance improvement.
+
+opal-prd:
+- Display an explict and obvious message if running on a system that does
+ not support opal-prd, such as an IBM FSP based POWER system, where the
+ FSP takes on the role of opal-prd.
+
+pflash:
+- Fix a missing (C) header
+ - cherry-picked from master.
+
+General:
+- Don't link with libgcc
+ - On some toolchains, we don't have libgcc available.
+
+POWER8 PHB (PCIe) specific:
+- hw/phb3: Flush cache line after updating P/Q bits
+ When doing an MSI EOI, we update the P and Q bits in the IVE. That causes
+ the corresponding cache line to be dirty in the L3 which will cause a
+ subsequent update by the PHB (upon recieving the next MSI) to get a few
+ retries until it gets flushed.
+
+ We improve the situation (and thus performance) by doing a dcbf
+ instruction to force a flush of the update we do in SW.
+
+ This improves interrupt performance, reducing latency per interrupt.
+ The improvement will vary by workload.
+
+IBM FSP based machines:
+- FSP: Give up PSI link on shutdown
+ This clears up some erroneous SRCs (error logs) in some situations.
+- Correctly report back Real Time Clock errors to host
+ Under certain rare error conditions, we could return an error code
+ to the host OS that would cause current Linux kernels to get stuck
+ in an infinite loop during boot.
+ This was introduced in skiboot-5.0-rc1.
