[stm32f429i-discovery] Added fancyblink example.

For some reason when setting the ram size to 256 in the linker file we
are getting a memory access error. Needs more investigation.

examples/stm32/f4/stm32f429i-discovery/stm32f429i-discovery.ld

@@ -0,0 +1,33 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
+ * Copyright (C) 2015 Piotr Esden-Tempski <piotr@esden.net>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for ST STM32F429IDISCOVERY (STM32F429ZI, 2048K flash, 256K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 2048K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 128K /* (esden) This should be 256 but I get segfault. :( */
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f4.ld
+