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.. _skiboot-5.9.4:
=============
skiboot-5.9.4
=============
skiboot 5.9.4 was released on Wednesday November 29th, 2017. It replaces
:ref:`skiboot-5.9.3` as the current stable release in the 5.9.x series.
Over :ref:`skiboot-5.9.3`, we have one NPU2/NVLink2 fix that works around
a potential glitch (the one :ref:`skiboot-5.9.3` would hard crash on rather
than let a system continue to run until it mysteriously crashed later on).
That fix is in two parts:
- npu2: hw-procedures: Change phy_rx_clock_sel values to recover from a
potential glitch.
- npu2: hw-procedures: Manipulate IOVALID during training
Ensure that the IOVALID bit for this brick is raised at the start of
link training, in the reset_ntl procedure.
Then, to protect us from a glitch when the PHY clock turns off or gets
chopped, lower IOVALID for the duration of the phy_reset and
phy_rx_dccal procedures.
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