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
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patacongo
parent
9ba0baec41
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9df1608786
@ -77,6 +77,9 @@ CONFIG_ARCH_CHIP_LPC17XX=y
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CONFIG_ARCH_CORTEXM3=y
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CONFIG_ARCH_FAMILY="armv7-m"
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CONFIG_ARCH_CHIP="lpc17xx"
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# CONFIG_ARMV7M_USEBASEPRI is not set
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CONFIG_ARCH_HAVE_CMNVECTOR=y
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# CONFIG_ARMV7M_CMNVECTOR is not set
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CONFIG_ARCH_HAVE_MPU=y
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# CONFIG_ARMV7M_MPU is not set
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CONFIG_BOARD_LOOPSPERMSEC=8111
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@ -271,6 +274,7 @@ CONFIG_DEV_CONSOLE=y
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CONFIG_SDCLONE_DISABLE=y
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# CONFIG_SCHED_WORKQUEUE is not set
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CONFIG_SCHED_WAITPID=y
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# CONFIG_SCHED_STARTHOOK is not set
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# CONFIG_SCHED_ATEXIT is not set
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# CONFIG_SCHED_ONEXIT is not set
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CONFIG_USER_ENTRYPOINT="nsh_main"
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@ -280,9 +284,7 @@ CONFIG_DISABLE_OS_API=y
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# CONFIG_DISABLE_PTHREAD is not set
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# CONFIG_DISABLE_SIGNALS is not set
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# CONFIG_DISABLE_MQUEUE is not set
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# CONFIG_DISABLE_MOUNTPOINT is not set
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# CONFIG_DISABLE_ENVIRON is not set
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CONFIG_DISABLE_POLL=y
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#
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# Signal Numbers
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@ -318,6 +320,7 @@ CONFIG_PTHREAD_STACK_DEFAULT=2048
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#
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# Device Drivers
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#
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CONFIG_DISABLE_POLL=y
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CONFIG_DEV_NULL=y
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# CONFIG_DEV_ZERO is not set
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# CONFIG_LOOP is not set
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@ -437,6 +440,7 @@ CONFIG_NET_ARPTAB_SIZE=16
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#
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# File system configuration
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#
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# CONFIG_DISABLE_MOUNTPOINT is not set
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# CONFIG_FS_RAMMAP is not set
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CONFIG_FS_FAT=y
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CONFIG_FAT_LCNAMES=y
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@ -452,6 +456,7 @@ CONFIG_FAT_MAXFNAME=32
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#
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# System Logging
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#
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# CONFIG_SYSLOG_ENABLE is not set
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# CONFIG_SYSLOG is not set
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#
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@ -496,6 +501,8 @@ CONFIG_LIB_HOMEDIR="/"
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# CONFIG_EOL_IS_BOTH_CRLF is not set
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CONFIG_EOL_IS_EITHER_CRLF=y
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# CONFIG_LIBC_EXECFUNCS is not set
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CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=1024
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CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=2048
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# CONFIG_LIBC_STRERROR is not set
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# CONFIG_LIBC_PERROR_STDOUT is not set
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CONFIG_ARCH_LOWPUTC=y
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@ -558,7 +565,6 @@ CONFIG_EXAMPLES_NSH=y
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# CONFIG_EXAMPLES_OSTEST is not set
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# CONFIG_EXAMPLES_PASHELLO is not set
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# CONFIG_EXAMPLES_PIPE is not set
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# CONFIG_EXAMPLES_POLL is not set
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# CONFIG_EXAMPLES_POSIXSPAWN is not set
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# CONFIG_EXAMPLES_QENCODER is not set
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# CONFIG_EXAMPLES_RGMP is not set
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@ -678,6 +684,10 @@ CONFIG_NSH_NESTDEPTH=3
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# CONFIG_NSH_DISABLESCRIPT is not set
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# CONFIG_NSH_DISABLEBG is not set
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CONFIG_NSH_CONSOLE=y
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#
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# USB Trace Support
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#
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# CONFIG_NSH_CONDEV is not set
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CONFIG_NSH_ARCHINIT=y
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CONFIG_NSH_TELNET=y
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@ -741,3 +751,7 @@ CONFIG_READLINE_ECHO=y
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# Sysinfo
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#
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# CONFIG_SYSTEM_SYSINFO is not set
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#
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# USB Monitor
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#
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@ -8,8 +8,101 @@ NXP LPC1788 MCU
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CONTENTS
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========
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o FPU
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o Configuration
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FPU
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===
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FPU Configuration Options
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-------------------------
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There are two version of the FPU support built into the LPC17xx port.
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1. Lazy Floating Point Register Save.
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This is an untested implementation that saves and restores FPU registers
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only on context switches. This means: (1) floating point registers are
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not stored on each context switch and, hence, possibly better interrupt
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performance. But, (2) since floating point registers are not saved,
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you cannot use floating point operations within interrupt handlers.
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This logic can be enabled by simply adding the following to your .config
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file:
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CONFIG_ARCH_FPU=y
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2. Non-Lazy Floating Point Register Save
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Mike Smith has contributed an extensive re-write of the ARMv7-M exception
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handling logic. This includes verified support for the FPU. These changes
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have not yet been incorporated into the mainline and are still considered
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experimental. These FPU logic can be enabled with:
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CONFIG_ARCH_FPU=y
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CONFIG_ARMV7M_CMNVECTOR=y
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You will probably also changes to the ld.script in if this option is selected.
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This should work:
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-ENTRY(_stext)
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+ENTRY(__start) /* Treat __start as the anchor for dead code stripping */
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+EXTERN(_vectors) /* Force the vectors to be included in the output */
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CFLAGS
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------
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Only the Atollic toolchain has built-in support for the Cortex-M4 FPU. You will see
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the following lines in each Make.defs file:
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ifeq ($(CONFIG_STM32_ATOLLIC_LITE),y)
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# Atollic toolchain under Windows
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...
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ifeq ($(CONFIG_ARCH_FPU),y)
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ARCHCPUFLAGS = -mcpu=cortex-m4 -mthumb -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard
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else
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ARCHCPUFLAGS = -mcpu=cortex-m3 -mthumb -mfloat-abi=soft
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endif
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endif
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If you are using a toolchain other than the Atollic toolchain, then to use the FPU
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you will also have to modify the CFLAGS to enable compiler support for the ARMv7-M
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FPU. As of this writing, there are not many GCC toolchains that will support the
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ARMv7-M FPU.
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As a minimum you will need to add CFLAG options to (1) enable hardware floating point
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code generation, and to (2) select the FPU implementation. You might try the same
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options as used with the Atollic toolchain in the Make.defs file:
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ARCHCPUFLAGS = -mcpu=cortex-m4 -mthumb -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard
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Configuration Changes
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---------------------
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Below are all of the configuration changes that I had to make to configs/stm3240g-eval/nsh2
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in order to successfully build NuttX using the Atollic toolchain WITH FPU support:
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-CONFIG_ARCH_FPU=n : Enable FPU support
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+CONFIG_ARCH_FPU=y
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-CONFIG_STM32_CODESOURCERYW=y : Disable the CodeSourcery toolchain
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+CONFIG_STM32_CODESOURCERYW=n
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-CONFIG_STM32_ATOLLIC_LITE=n : Enable *one* the Atollic toolchains
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CONFIG_STM32_ATOLLIC_PRO=n
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-CONFIG_STM32_ATOLLIC_LITE=y : The "Lite" version
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CONFIG_STM32_ATOLLIC_PRO=n : The "Pro" version
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-CONFIG_INTELHEX_BINARY=y : Suppress generation FLASH download formats
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+CONFIG_INTELHEX_BINARY=n : (Only necessary with the "Lite" version)
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-CONFIG_HAVE_CXX=y : Suppress generation of C++ code
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+CONFIG_HAVE_CXX=n : (Only necessary with the "Lite" version)
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See the section above on Toolchains, NOTE 2, for explanations for some of
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the configuration settings. Some of the usual settings are just not supported
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by the "Lite" version of the Atollic toolchain.
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CONFIGURURATION
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===============
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