From 06e7e5dfa12c3e7bba0a5317980b09b26d0b034d Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Tue, 18 Feb 2014 12:07:17 -0600
Subject: [PATCH] More STM32F429 Discovery FPU-related changes from David
 Alessio

---
 ChangeLog                           |  5 ++++-
 arch/arm/src/armv7-m/Toolchain.defs | 10 +++++++++-
 arch/arm/src/armv7-m/up_fpu.S       |  2 +-
 arch/arm/src/stm32/Kconfig          |  2 +-
 4 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 4a8390ab84..59231ad1a9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6588,4 +6588,7 @@
 	  (2014-2-16).
 	* sched/task_terminate.c:  Always returns an error because the
 	  return value was not being set correctly.  From Gosha (2014-2-18).
-
+	* stm32f429i-disco/ostest-fpu:  OS test for FPU-enabled system from
+	  David Alessio (2014-2-18).
+	* Other misc changes to support FPU on STM32F429 Discovery from
+	  David Alession (2014-2-18)
diff --git a/arch/arm/src/armv7-m/Toolchain.defs b/arch/arm/src/armv7-m/Toolchain.defs
index ecdcb7f146..591923fe82 100644
--- a/arch/arm/src/armv7-m/Toolchain.defs
+++ b/arch/arm/src/armv7-m/Toolchain.defs
@@ -186,7 +186,15 @@ ifeq ($(CONFIG_ARMV7M_OABI_TOOLCHAIN),y)
 else
   CROSSDEV ?= arm-nuttx-eabi-
   ARCROSSDEV ?= arm-nuttx-eabi-
-  ARCHCPUFLAGS = -mcpu=cortex-m3 -mthumb -mfloat-abi=soft
+  ifeq ($(CONFIG_ARCH_CORTEXM4),y)
+    ifeq ($(CONFIG_ARCH_FPU),y)
+      ARCHCPUFLAGS = -mcpu=cortex-m4 -mthumb -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard
+    else
+      ARCHCPUFLAGS = -mcpu=cortex-m4 -mthumb -march=armv7e-m -mfloat-abi=soft
+    endif
+  else ifeq ($(CONFIG_ARCH_CORTEXM3),y)
+    ARCHCPUFLAGS = -mcpu=cortex-m3 -mthumb -mfloat-abi=soft
+  endif
 endif
   MAXOPTIMIZATION ?= -Os
 endif
diff --git a/arch/arm/src/armv7-m/up_fpu.S b/arch/arm/src/armv7-m/up_fpu.S
index e7a4d237ca..f43367fa4a 100644
--- a/arch/arm/src/armv7-m/up_fpu.S
+++ b/arch/arm/src/armv7-m/up_fpu.S
@@ -35,7 +35,7 @@
 /*
  * When this file is assembled, it will require the following GCC options:
  *
- * -mcpu=cortex-m3 -mfloat-abi=hard -mfpu=vfp -meabi=5
+ * -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=vfp -meabi=5 -mthumb
  */
 
 /************************************************************************************
diff --git a/arch/arm/src/stm32/Kconfig b/arch/arm/src/stm32/Kconfig
index 7945671f89..16b02deb2f 100644
--- a/arch/arm/src/stm32/Kconfig
+++ b/arch/arm/src/stm32/Kconfig
@@ -774,7 +774,7 @@ config STM32_OTGFS
 config STM32_OTGHS
 	bool "OTG HS"
 	default n
-	depends on STM32_STM32F20XX || STM32_STM32F40XX
+	depends on STM32_STM32F20XX || STM32_STM32F40XX || STM32_STM32F429
 
 config STM32_OTGHS_FS_MODE
 	bool "Use OTG HS in FS mode"