LPC17xx now supports FPU needed by LPC1788; LPC17xx can not use Mike's common vectors

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5623 42af7a65-404d-4744-a932-0658087f49c3

2 files changed, 110 insertions, 3 deletions

diff --git a/nuttx/configs/olimex-lpc1766stk/nsh/defconfig b/nuttx/configs/olimex-lpc1766stk/nsh/defconfig
index 05ca0fa2e..fc793ec7b 100755
--- a/nuttx/configs/olimex-lpc1766stk/nsh/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/nsh/defconfig
@@ -77,6 +77,9 @@ CONFIG_ARCH_CHIP_LPC17XX=y
 CONFIG_ARCH_CORTEXM3=y
 CONFIG_ARCH_FAMILY="armv7-m"
 CONFIG_ARCH_CHIP="lpc17xx"
+# CONFIG_ARMV7M_USEBASEPRI is not set
+CONFIG_ARCH_HAVE_CMNVECTOR=y
+# CONFIG_ARMV7M_CMNVECTOR is not set
 CONFIG_ARCH_HAVE_MPU=y
 # CONFIG_ARMV7M_MPU is not set
 CONFIG_BOARD_LOOPSPERMSEC=8111
@@ -271,6 +274,7 @@ CONFIG_DEV_CONSOLE=y
 CONFIG_SDCLONE_DISABLE=y
 # CONFIG_SCHED_WORKQUEUE is not set
 CONFIG_SCHED_WAITPID=y
+# CONFIG_SCHED_STARTHOOK is not set
 # CONFIG_SCHED_ATEXIT is not set
 # CONFIG_SCHED_ONEXIT is not set
 CONFIG_USER_ENTRYPOINT="nsh_main"
@@ -280,9 +284,7 @@ CONFIG_DISABLE_OS_API=y
 # CONFIG_DISABLE_PTHREAD is not set
 # CONFIG_DISABLE_SIGNALS is not set
 # CONFIG_DISABLE_MQUEUE is not set
-# CONFIG_DISABLE_MOUNTPOINT is not set
 # CONFIG_DISABLE_ENVIRON is not set
-CONFIG_DISABLE_POLL=y
 
 #
 # Signal Numbers
@@ -318,6 +320,7 @@ CONFIG_PTHREAD_STACK_DEFAULT=2048
 #
 # Device Drivers
 #
+CONFIG_DISABLE_POLL=y
 CONFIG_DEV_NULL=y
 # CONFIG_DEV_ZERO is not set
 # CONFIG_LOOP is not set
@@ -437,6 +440,7 @@ CONFIG_NET_ARPTAB_SIZE=16
 #
 # File system configuration
 #
+# CONFIG_DISABLE_MOUNTPOINT is not set
 # CONFIG_FS_RAMMAP is not set
 CONFIG_FS_FAT=y
 CONFIG_FAT_LCNAMES=y
@@ -452,6 +456,7 @@ CONFIG_FAT_MAXFNAME=32
 #
 # System Logging
 #
+# CONFIG_SYSLOG_ENABLE is not set
 # CONFIG_SYSLOG is not set
 
 #
@@ -496,6 +501,8 @@ CONFIG_LIB_HOMEDIR="/"
 # CONFIG_EOL_IS_BOTH_CRLF is not set
 CONFIG_EOL_IS_EITHER_CRLF=y
 # CONFIG_LIBC_EXECFUNCS is not set
+CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=1024
+CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=2048
 # CONFIG_LIBC_STRERROR is not set
 # CONFIG_LIBC_PERROR_STDOUT is not set
 CONFIG_ARCH_LOWPUTC=y
@@ -558,7 +565,6 @@ CONFIG_EXAMPLES_NSH=y
 # CONFIG_EXAMPLES_OSTEST is not set
 # CONFIG_EXAMPLES_PASHELLO is not set
 # CONFIG_EXAMPLES_PIPE is not set
-# CONFIG_EXAMPLES_POLL is not set
 # CONFIG_EXAMPLES_POSIXSPAWN is not set
 # CONFIG_EXAMPLES_QENCODER is not set
 # CONFIG_EXAMPLES_RGMP is not set
@@ -678,6 +684,10 @@ CONFIG_NSH_NESTDEPTH=3
 # CONFIG_NSH_DISABLESCRIPT is not set
 # CONFIG_NSH_DISABLEBG is not set
 CONFIG_NSH_CONSOLE=y
+
+#
+# USB Trace Support
+#
 # CONFIG_NSH_CONDEV is not set
 CONFIG_NSH_ARCHINIT=y
 CONFIG_NSH_TELNET=y
@@ -741,3 +751,7 @@ CONFIG_READLINE_ECHO=y
 # Sysinfo
 #
 # CONFIG_SYSTEM_SYSINFO is not set
+
+#
+# USB Monitor
+#
diff --git a/nuttx/configs/open1788/README.txt b/nuttx/configs/open1788/README.txt
index 144be5242..154d4b2f7 100644
--- a/nuttx/configs/open1788/README.txt
+++ b/nuttx/configs/open1788/README.txt
@@ -8,8 +8,101 @@ NXP LPC1788 MCU
 CONTENTS
 ========
 
+  o FPU
   o Configuration
 
+FPU
+===
+
+FPU Configuration Options
+-------------------------
+
+There are two version of the FPU support built into the LPC17xx port.
+
+1. Lazy Floating Point Register Save.
+
+   This is an untested implementation that saves and restores FPU registers
+   only on context switches.  This means: (1) floating point registers are
+   not stored on each context switch and, hence, possibly better interrupt
+   performance.  But, (2) since floating point registers are not saved,
+   you cannot use floating point operations within interrupt handlers.
+
+   This logic can be enabled by simply adding the following to your .config
+   file:
+
+   CONFIG_ARCH_FPU=y
+
+2. Non-Lazy Floating Point Register Save
+
+   Mike Smith has contributed an extensive re-write of the ARMv7-M exception
+   handling logic. This includes verified support for the FPU.  These changes
+   have not yet been incorporated into the mainline and are still considered
+   experimental.  These FPU logic can be enabled with:
+
+   CONFIG_ARCH_FPU=y
+   CONFIG_ARMV7M_CMNVECTOR=y
+
+   You will probably also changes to the ld.script in if this option is selected.
+   This should work:
+
+   -ENTRY(_stext)
+   +ENTRY(__start)         /* Treat __start as the anchor for dead code stripping */
+   +EXTERN(_vectors)       /* Force the vectors to be included in the output */
+
+CFLAGS
+------
+
+Only the Atollic toolchain has built-in support for the Cortex-M4 FPU.  You will see
+the following lines in each Make.defs file:
+
+  ifeq ($(CONFIG_STM32_ATOLLIC_LITE),y)
+    # Atollic toolchain under Windows
+    ...
+  ifeq ($(CONFIG_ARCH_FPU),y)
+    ARCHCPUFLAGS = -mcpu=cortex-m4 -mthumb -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard
+  else
+    ARCHCPUFLAGS = -mcpu=cortex-m3 -mthumb -mfloat-abi=soft
+  endif
+  endif
+
+If you are using a toolchain other than the Atollic toolchain, then to use the FPU
+you will also have to modify the CFLAGS to enable compiler support for the ARMv7-M
+FPU.  As of this writing, there are not many GCC toolchains that will support the
+ARMv7-M FPU.  
+
+As a minimum you will need to add CFLAG options to (1) enable hardware floating point
+code generation, and to (2) select the FPU implementation.  You might try the same
+options as used with the Atollic toolchain in the Make.defs file:
+
+  ARCHCPUFLAGS = -mcpu=cortex-m4 -mthumb -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard
+
+Configuration Changes
+---------------------
+
+Below are all of the configuration changes that I had to make to configs/stm3240g-eval/nsh2
+in order to successfully build NuttX using the Atollic toolchain WITH FPU support:
+
+  -CONFIG_ARCH_FPU=n              : Enable FPU support
+  +CONFIG_ARCH_FPU=y
+
+  -CONFIG_STM32_CODESOURCERYW=y   : Disable the CodeSourcery toolchain
+  +CONFIG_STM32_CODESOURCERYW=n
+
+  -CONFIG_STM32_ATOLLIC_LITE=n   : Enable *one* the Atollic toolchains
+   CONFIG_STM32_ATOLLIC_PRO=n
+  -CONFIG_STM32_ATOLLIC_LITE=y   : The "Lite" version
+   CONFIG_STM32_ATOLLIC_PRO=n    : The "Pro" version
+
+  -CONFIG_INTELHEX_BINARY=y       : Suppress generation FLASH download formats
+  +CONFIG_INTELHEX_BINARY=n       : (Only necessary with the "Lite" version)
+
+  -CONFIG_HAVE_CXX=y              : Suppress generation of C++ code
+  +CONFIG_HAVE_CXX=n              : (Only necessary with the "Lite" version)
+
+See the section above on Toolchains, NOTE 2, for explanations for some of
+the configuration settings.  Some of the usual settings are just not supported
+by the "Lite" version of the Atollic toolchain.
+
 CONFIGURURATION
 ===============