1.. _skiboot-5.9.4: 2 3============= 4skiboot-5.9.4 5============= 6 7skiboot 5.9.4 was released on Wednesday November 29th, 2017. It replaces 8:ref:`skiboot-5.9.3` as the current stable release in the 5.9.x series. 9 10Over :ref:`skiboot-5.9.3`, we have one NPU2/NVLink2 fix that works around 11a potential glitch (the one :ref:`skiboot-5.9.3` would hard crash on rather 12than let a system continue to run until it mysteriously crashed later on). 13 14That fix is in two parts: 15 16- npu2: hw-procedures: Change phy_rx_clock_sel values to recover from a 17 potential glitch. 18 19- npu2: hw-procedures: Manipulate IOVALID during training 20 21 Ensure that the IOVALID bit for this brick is raised at the start of 22 link training, in the reset_ntl procedure. 23 24 Then, to protect us from a glitch when the PHY clock turns off or gets 25 chopped, lower IOVALID for the duration of the phy_reset and 26 phy_rx_dccal procedures. 27