forked from Archive/PX4-Autopilot
Things missing from lib/Kconfig
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@5093 7fd9a85b-ad96-42d3-883c-3090e2eb8679
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@ -82,41 +82,53 @@ config LIBC_PERROR_STDOUT
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be defined, however, to provide perror() output that is serialized with
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other stdout messages.
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config LIBC_PERROR_DEVNAME
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string "perror() to device"
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default "/dev/console"
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depends on !LIBC_PERROR_STDOUT
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---help---
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Another non-standard option is to provide perror() output to a logging device
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or file. LIBC_PERROR_DEVNAME may be defined to be any write-able,
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character device (or file).
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config ARCH_LOWPUTC
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bool "Low-level console output"
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default "y"
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---help---
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architecture supports low-level, boot time console output
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architecture supports low-level, boot time console output
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config LIB_SENDFILE_BUFSIZE
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int "sendfile() buffer size"
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default 512
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---help---
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Size of the I/O buffer to allocate in sendfile(). Default: 512b
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Size of the I/O buffer to allocate in sendfile(). Default: 512b
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config ENABLE_ARCH_OPTIMIZED_FUN
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config ARCH_ROMGETC
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bool "Support for ROM string access"
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default n
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---help---
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In Harvard architectures, data accesses and instruction accesses
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occur on different busses, perhaps concurrently. All data accesses
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are performed on the data bus unless special machine instructions
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are used to read data from the instruction address space. Also, in
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the typical MCU, the available SRAM data memory is much smaller that
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the non-volatile FLASH instruction memory. So if the application
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requires many constant strings, the only practical solution may be
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to store those constant strings in FLASH memory where they can only
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be accessed using architecture-specific machine instructions.
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If ARCH_ROMGETC is defined, then the architecture logic must export
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the function up_romgetc(). up_romgetc() will simply read one byte
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of data from the instruction space.
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If ARCH_ROMGETC, certain C stdio functions are effected: (1) All
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format strings in printf, fprintf, sprintf, etc. are assumed to lie
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in FLASH (string arguments for %s are still assumed to reside in SRAM).
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And (2), the string argument to puts and fputs is assumed to reside
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in FLASH. Clearly, these assumptions may have to modified for the
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particular needs of your environment. There is no "one-size-fits-all"
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solution for this problem.
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config ARCH_OPTIMIZED_FUNCTIONS
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bool "Enable arch optimized functions"
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default n
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---help---
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Allow for architecture optimized implementations
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The architecture can provide optimized versions of the
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following to improve system performance
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Allow for architecture optimized implementations of certain library
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functions. Architecture-specific implementations can improve overall
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system performance.
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The architecture may provide custom versions of certain
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standard header files:
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config ARCH_MATH_H, ARCH_STDBOOL_H, ARCH_STDINT_H
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if ENABLE_ARCH_OPTIMIZED_FUN
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if ARCH_OPTIMIZED_FUNCTIONS
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config ARCH_MEMCPY
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bool "memcpy"
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default n
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@ -157,3 +169,71 @@ config ARCH_BZERO
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bool "bzero"
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default n
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endif
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config ARCH_HEADER_FILES
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bool "Customize header files"
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default n
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---help---
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The architecture may provide custom versions of certain
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standard header files
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if ARCH_HEADER_FILES
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config ARCH_STDBOOL_H
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bool "stdbool.h"
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default n
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---help---
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The stdbool.h header file can be found at nuttx/include/stdbool.h.
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However, that header includes logic to redirect the inclusion of an
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architecture specific header file like:
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#ifdef CONFIG_ARCH_STDBOOL_H
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# include <arch/stdbool.h>
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#else
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...
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#endif
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Recall that that include path, include/arch, is a symbolic link and
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will refer to a version of stdbool.h at nuttx/arch/<architecture>/include/stdbool.h.
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config ARCH_MATH_H
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bool "math.h"
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default n
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---help---
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There is also a re-directing version of math.h in the source tree.
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However, it resides out-of-the-way at include/nuttx/math.h because it
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conflicts too often with the system math.h. If ARCH_MATH_H=y is
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defined, however, the top-level makefile will copy the redirecting
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math.h header file from include/nuttx/math.h to include/math.h. math.h
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will then include the architecture-specific version of math.h that you
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must provide at nuttx/arch/>architecture</include/math.h.
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#ifdef CONFIG_ARCH_MATH_H
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# include <arch/math.h>
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#endif
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So for the architectures that define ARCH_MATH_H=y, include/math.h
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will be the redirecting math.h header file; for the architectures
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that don't select ARCH_MATH_H, the redirecting math.h header file
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will stay out-of-the-way in include/nuttx/.
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config ARCH_STDARG_H
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bool "stdarg.h"
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default n
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---help---
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There is also a redirecting version of stdarg.h in the source tree
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as well. It also resides out-of-the-way at include/nuttx/stdarg.h.
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This is because you should normally use your toolchain's stdarg.h
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file. But sometimes, your toolchain's stdarg.h file may have other
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header file dependencies and so may not be usable in the NuttX build
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environment. In those cases, you may have to create a architecture-
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specific stdarg.h header file at nuttx/arch/<architecture>/include/stdarg.h
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If ARCH_STDARG_H=y is defined, the top-level makefile will copy the
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re-directing stdarg.h header file from include/nuttx/stdarg.h to
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include/stdarg.h. So for the architectures that cannot use their
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toolchain's stdarg.h file, they can use this alternative by defining
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ARCH_STDARG_H=y and providing. If ARCH_STDARG_H, is not defined, then
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the stdarg.h header file will stay out-of-the-way in include/nuttx/.
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endif
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