snprintf():  If size is zero, then snprintf() should return the size of the required buffer without writing anyting.  From Sami Pelkonen

STM32 RTC: Add retry to initialization logic.  Sometime RTC initialization takes longer.  From dlsitzer.

Make sure that all references to up_prioritize_irq() are conditioned on CONFIG_ARCH_IRQPRIO.  Noted by Make Smith

STM32 I2C: Bring in PX4 fix for I2C in very high noise environments or with rogue perpipherals.  Taken from the PX4 commit by Tridge

Create P-Code execution helper in apps/interpreters/prun; The P-Code binary format is functional except that there are still some modularity and kernel build issues that need to be addressed.

Add support for the STM32152 and STM32162 Medium+ density parts (plus miscellaneous other improvements to the original STM32151 logic).  From Jussi Kivilinna and Sami Pelkonen

The Nucleo-F401RE has no on-board cystal and, hence, must use the on-chip HSI oscillator for the PLL include clock

SAM4S Xplained Pro: Clean-up of LED usage and also some integration of new timer features.  From Bob Doiron

The alternate console device CONFIG_NSH_CONDEV must not be defined unconditionally.  This causes errors when using Telnet sessions.  This was solved by adding CONFIG_NSH_ALTCONDEV: CONFIG_NSH_ALTCONDEV enables or disables the feature then, if enabled, CONFIG_NSH_CONDEV provides the alternative console device name

If the CPU load measurements are being driven by an external clock, then the prototype for sched_process_cpuload() must be available in include/nuttx/arch.h

Updated changelogs and release notes in preparation for the 7.2 release.  Still need to do a little more before the release

STM32:  More places where up_prioritize_irq is called when CONFIG_ARCH_IRQPRIO is not defined.  Sourceforge ticket #26

Sourceforge ticket #26: STM32 up_prioritize_irq should not be called if CONFIG_ARCH_IRQPRIO is not defined