add skiboot-5.4.1 release notes

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

doc/release-notes/skiboot-5.4.1.rst

@@ -0,0 +1,27 @@
+.. _skiboot-5.4.1:
+
+=============
+skiboot-5.4.1
+=============
+
+skiboot-5.4.1 was released on Tuesday November 29th 2016. It replaces
+:ref:`skiboot-5.4.0` as the current stable release.
+
+Over :ref:`skiboot-5.4.0`, we have a few changes:
+
+- Nuvoton i2c TPM driver: bug fixes and improvements, especially around
+  timeouts and error handling.
+- Limit number of "Poller recursion detected" errors to display.
+  In some error conditions, we could spiral out of control on this
+  and spend all of our time printing the exact same backtrace.
+- slw: do SLW timer testing while holding xscom lock.
+  In some situations without this, it could take long enough to get
+  the xscom lock that the 1ms timeout would expire and we'd falsely
+  think the SLW timer didn't work when in fact it did.
+- p8i2c: Use calculated poll_interval when booting OPAL.
+  Otherwise we'd default to 2seconds (TIMER_POLL) during boot on
+  chips with a functional i2c interrupt, leading to slow i2c
+  during boot (or hitting timeouts instead).
+- i2c: More efficiently run TPM I2C operations during boot, avoiding hitting
+  timeouts
+- fsp: Don't recurse pollers in ibm_fsp_terminate