SAMV7: Update floating point and TCM configuration options. Update TODO list. Update comments. Refresh a configuration

arch/arm/Kconfig

@@ -348,13 +348,26 @@ config ARCH_HAVE_FPU
 	bool
 	default n
 
+config ARCH_HAVE_DPFPU
+	bool
+	default n
+
 config ARCH_FPU
 	bool "FPU support"
 	default y
 	depends on ARCH_HAVE_FPU
 	---help---
 		Build in support for the ARM Cortex-M4 Floating Point Unit (FPU).
-		Check your chip specifications first; not all Cortex-M4 chips support the FPU.
+		Check your chip specifications first; not all Cortex-M4 chips
+		support the FPU.
+
+config ARCH_DPFPU
+	bool "Double precision FPU support"
+	default y
+	depends on ARCH_FPU && ARCH_HAVE_DPFPU
+	---help---
+		Enable toolchain support for double precision (64-bit) floating
+		point if both the toolchain and the hardware support it.
 
 config ARMV7M_MPU
 	bool "MPU support"

arch/arm/src/armv7-m/Kconfig

@@ -23,6 +23,24 @@ config ARMV7M_DCACHE
 	default n
 	depends on ARMV7M_HAVE_DCACHE
 
+config ARMV7M_HAVE_ITCM
+	bool
+	default n
+
+config ARMV7M_HAVE_DTCM
+	bool
+	default n
+
+config ARMV7M_ITCM
+	bool "Use ITCM"
+	default n
+	depends on ARMV7M_HAVE_ITCM
+
+config ARMV7M_DTCM
+	bool "Use DTCM"
+	default n
+	depends on ARMV7M_HAVE_DTCM
+
 choice
 	prompt "Toolchain Selection"
 	default ARMV7M_TOOLCHAIN_GNU_EABIW if HOST_WINDOWS

arch/arm/src/armv7-m/Toolchain.defs

@@ -128,7 +128,11 @@ ifeq ($(CONFIG_ARCH_CORTEXM4),y)
   TOOLCHAIN_MTUNE    := -mtune=cortex-m4
   TOOLCHAIN_MARCH    := -march=armv7e-m
   ifeq ($(CONFIG_ARCH_FPU),y)
+  ifeq ($(CONFIG_ARCH_DPFPU),y)
+    TOOLCHAIN_MFLOAT := -mfpu=fpv4-sp -mfloat-abi=hard
+  else
     TOOLCHAIN_MFLOAT := -mfpu=fpv4-sp-d16 -mfloat-abi=hard
+  endif
   else
     TOOLCHAIN_MFLOAT := -mfloat-abi=soft
   endif
@@ -140,9 +144,13 @@ else ifeq ($(CONFIG_ARCH_CORTEXM7),y)
   TOOLCHAIN_MCPU     := -mcpu=cortex-m4
   TOOLCHAIN_MTUNE    := -mtune=cortex-m4
   TOOLCHAIN_MARCH    := -march=armv7e-m
+  # FIXME: Most tools do not yet fpv5 FPU types either
   ifeq ($(CONFIG_ARCH_FPU),y)
-    # TOOLCHAIN_MFLOAT := -mfpu=fpv5-sp-d16 -mfloat-abi=hard # Single precision
+  ifeq ($(CONFIG_ARCH_DPFPU),y)
     TOOLCHAIN_MFLOAT := -mfpu=fpv5-d16 -mfloat-abi=hard
+  else
+    TOOLCHAIN_MFLOAT := -mfpu=fpv5-sp-d16 -mfloat-abi=hard
+  endif
   else
     TOOLCHAIN_MFLOAT := -mfloat-abi=soft
   endif

arch/arm/src/samv7/Kconfig

@@ -54,8 +54,12 @@ endchoice # Atmel SAMV7 Chip Selection
 config ARCH_CHIP_SAMV71
 	bool
 	default n
+	select ARCH_HAVE_FPU
+	select ARCH_HAVE_DPFPU # REVISIT
 	select ARMV7M_HAVE_ICACHE
 	select ARMV7M_HAVE_DCACHE
+	select ARMV7M_HAVE_ITCM
+	select ARMV7M_HAVE_DTCM
 
 config ARCH_CHIP_SAMV71Q
 	bool