skiboot 6.0.11 release notes

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

doc/release-notes/skiboot-6.0.11.rst

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+.. _skiboot-6.0.11:
+
+==============
+skiboot-6.0.11
+==============
+
+skiboot 6.0.11 was released on Friday November 2nd, 2018. It replaces
+:ref:`skiboot-6.0.10` as the current stable release in the 6.0.x series.
+
+It is recommended that 6.0.11 be used instead of any previous 6.0.x version
+due to the bug fixes it contains.
+
+The bug fixes are:
+
+- phb4/capp: Only reset FIR bits that cause capp machine check
+
+  During CAPP recovery do_capp_recovery_scoms() will reset the CAPP Fir
+  register just after CAPP recovery is completed. This has an
+  unintentional side effect of preventing PRD from analyzing and
+  reporting this error. If PRD tries to read the CAPP FIR after opal has
+  already reset it, then it logs a critical error complaining "No active
+  error bits found".
+
+  To prevent this from happening we update do_capp_recovery_scoms() to
+  only reset fir bits that cause CAPP machine check (local xstop). This
+  is done by reading the CAPP Fir Action0/1 & Mask registers and
+  generating a mask which is then written on CAPP_FIR_CLEAR register.
+- phb4: Check for RX errors after link training
+
+  Some PHB4 PHYs can get stuck in a bad state where they are constantly
+  retraining the link. This happens transparently to skiboot and Linux
+  but will causes PCIe to be slow. Resetting the PHB4 clears the
+  problem.
+
+  We can detect this case by looking at the RX errors count where we
+  check for link stability. This patch does this by modifying the link
+  optimal code to check for RX errors. If errors are occurring we
+  retrain the link irrespective of the chip rev or card.
+
+  Normally when this problem occurs, the RX error count is maxed out at
+  255. When there is no problem, the count is 0. We chose 8 as the max
+  rx errors value to give us some margin for a few errors. There is also
+  a knob that can be used to set the error threshold for when we should
+  retrain the link. i.e. ::
+
+      nvram -p ibm,skiboot --update-config phb-rx-err-max=8
+
+- core/flash: Log return code when ffs_init() fails
+- libflash/ipmi-hiomap: Use error codes rather than abort()
+- libflash/ipmi-hiomap: Restore window state on window/protocol reset
+- libflash/ipmi-hiomap: Improve event handling
+- p9dsu: Describe platform BMC register configuration
+
+  Provide the p9dsu-specific BMC configuration values required for the
+  host kernel to drive the VGA display correctly.
+- p9dsu: Add HIOMAP-over-IPMI support
+- libflash/ipmi-hiomap: Cleanup allocation on init failure