[Skiboot] skiboot v6.0.15 released!

[Stewart Smith]

Many thanks to Vasant for running this release - I just did the git tag.

skiboot-6.0.15
**************

skiboot 6.0.15 was released on Monday December 17th, 2018. It replaces
skiboot-6.0.14 as the current stable release in the 6.0.x series.

It is recommended that 6.0.15 be used instead of any previous 6.0.x
version due to the bug fixes it contains.

Bug fixes included in this release are:

* i2c: Fix i2c request hang during opal init if timers are not
  checked

  If an i2c request cannot go through the first time, because the bus
  is found in error and need a reset or it’s locked by the OCC for
  example, the underlying i2c implementation is using timers to manage
  the request. However during opal init, opal pollers may not be
  called, it depends in the context in which the i2c request is made.
  If the pollers are not called, the timers are not checked and we can
  end up with an i2c request which will not move foward and skiboot
  hangs.

  Fix it by explicitly checking the timers if we are waiting for an
  i2c request to complete and it seems to be taking a while.

* opal-prd: hservice: Enable hservice->wakeup() in BMC

  This patch enables HBRT to use HYP special wakeup register in
  openBMC which until now was only used in FSP based machines.

  This patch also adds a capability check for opal-prd so that HBRT
  can decide if the host special wakeup register can be used.

* npu2: Advertise correct TCE page size

  The P9 NPU workbook says that only 4K/64K/16M/256M page size are
  supported and in fact npu2_map_pe_dma_window() supports just these
  but in absence of the “ibm,supported-tce-sizes” property Linux
  assumes the default P9 PHB4 page sizes - 4K/64K/2M/1G - so when
  Linux tries 2M/1G TCEs, we get lots of “Unexpected TCE size” from
  npu2_tce_kill().

  This advertises TCE page sizes so Linux could handle it correctly,
  i.e. fall back to 4K/64K TCEs.

-- 
Stewart Smith
OPAL Architect, IBM.