Prep for 5.4 release

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2626 42af7a65-404d-4744-a932-0658087f49c3

ReleaseNotes

@@ -1199,3 +1199,30 @@ Two important bugfix was also included:
   * An important fix to the USB mass storage driver was contributed by
     David Hewson.
   * A serious error in the AT91SAM3U PIO handling was fixed.
+
+nuttx-5.4
+^^^^^^^^^
+
+This is the 51st release of NuttX.  This release includes one new, important
+extension to th NX graphics system (See http://www.nuttx.org/NXGraphicsSubsystem.html).
+
+NX was develop a couple years back on hardware that supported only framebuffer
+devices, that is, video hardware with video memory directly converts the memroy
+content to video.  However, most MCUs that NuttX focuses on do not support such
+video memory; rather, that typically only support LCDs via parallel or serial
+interfaces.
+
+This release of NuttX extends NX so that now renders directly to the LCD device
+via its serial or parallel interface.  No in-memory copy of the screen memory
+need be maintained so this solution should also work in MCUs with very limited
+SRAM.
+
+This initial release of this feature includes the verified NX extensions plus
+a driver for the HX8347, 16-bit parallel LCD.  This LCD supports 16-bit RGB
+(5:6:5).
+
+
+	* include/nuttx/lcd.h - Defines an LCD interface.
+	* graphics/nxglib/fb and lcd - Support LCD and framebuffer rasterizers for NX.
+	* configs/sam3u-ek/src/up_lcd.c - LCD driver for LCD on SAM3U-EK development
+	  board.