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+.. _skiboot-5.9.1:
+
+=============
+skiboot-5.9.1
+=============
+
+skiboot 5.9.1 was released on Tuesday November 14th, 2017. It replaces
+:ref:`skiboot-5.9` as the current stable release in the 5.9.x series.
+
+Over :ref:`skiboot-5.9`, we have two NPU2 (NVLink2) fixes and two XIVE
+bug fixes:
+
+- npu2: hw-procedures: Refactor reset_ntl procedure
+
+ Change the implementation of reset_ntl to match the latest programming
+ guide documentation.
+- npu2: hw-procedures: Add phy_rx_clock_sel()
+
+ Change the RX clk mux control to be done by software instead of HW. This
+ avoids glitches caused by changing the mux setting.
+
+- xive: Fix ability to clear some EQ flags
+
+ We could never clear "unconditional notify" and "escalate"
+- xive: Update inits for DD2.0
+
+ This updates some inits based on information from the HW
+ designers. This includes enabling some new DD2.0 features
+ that we don't yet exploit.