add skiboot-5.4.0-rc4 release notes

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

doc/release-notes/skiboot-5.4.0-rc4.rst

@@ -0,0 +1,50 @@
+.. _skiboot-5.4.0-rc4:
+
+=================
+skiboot-5.4.0-rc4
+=================
+
+skiboot-5.4.0-rc4 was released on Tuesday November 8th 2016. It is the
+fourth (and hopefully final) release candidate of skiboot 5.4, which will
+become the new stable release of skiboot following the 5.3 release, first
+released August 2nd 2016.
+
+skiboot-5.4.0-rc4 contains all bug fixes as of :ref:`skiboot-5.3.7`
+and :ref:`skiboot-5.1.18` (the currently maintained stable releases).
+
+For how the skiboot stable releases work, see :ref:`stable-rules` for details.
+
+Since this is a release candidate, it should *NOT* be put into production.
+
+With this release candidate, I'm hoping that it's the last one, and that within
+the week we're able to tag a final 5.4.0 release. There is one bit of code I'm
+hoping to merge in before the final 5.4.0, and that's the p8dtu platform
+definition. The aim is for skiboot-5.4.x to be in op-build v1.13, which is due
+by November 23rd 2016.
+
+Over :ref:`skiboot-5.4.0-rc3`, we have a few changes:
+
+- Add BMC platform to enable correct OEM IPMI commands
+
+  An out of tree platform (p8dtu) uses a different IPMI OEM command
+  for IPMI_PARTIAL_ADD_ESEL. This exposed some assumptions about the BMC
+  implementation in our core code.
+
+  Now, with platform.bmc, each platform can dictate (or detect) the BMC
+  that is present. We allow it to be set at runtime rather than purely
+  statically in struct platform as it's possible to have differing BMC
+  implementations on the one machine (e.g. AMI BMC or OpenBMC).
+
+- hw/ipmi-sensor: Fix setting of firmware progress sensor properly.
+
+  On FSP systems, OPAL was incorrectly setting firmware status
+  on a sensor id "00" which doesn't exist.
+
+- pflash: remove stray d in from info message
+- libflash/pflash: support whole chip erase on mtd access
+- boot_test: fix typo in console message
+- core/pci: Fix criteria in pci_cfg_reg_filter(), i.e. NVLink didn't work.
+
+- Remove KERNEL_COMMAND_LINE mention from config.h
+
+  We removed the functionality but not the define.