164 lines
3.5 KiB
Plaintext
164 lines
3.5 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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# These are library functions that may be overriden by architecture-
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# specific implementations. Not all architectures support implementations
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# for every library function.
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menu "Architecture-Specific Support"
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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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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 buses, 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 is selected, certain C stdio functions are effected: (1)
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All 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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# Default settings for C library functions that may be replaced with
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# architecture-specific versions.
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config LIBC_ARCH_MEMCPY
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bool
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default n
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config LIBC_ARCH_MEMCMP
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bool
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default n
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config LIBC_ARCH_MEMMOVE
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bool
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default n
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config LIBC_ARCH_MEMSET
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bool
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default n
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config LIBC_ARCH_STRCHR
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bool
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default n
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config LIBC_ARCH_STRCMP
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bool
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default n
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config LIBC_ARCH_STRCPY
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bool
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default n
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config LIBC_ARCH_STRNCPY
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bool
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default n
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config LIBC_ARCH_STRLEN
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bool
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default n
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config LIBC_ARCH_STRNLEN
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bool
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default n
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config LIBC_ARCH_ELF
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bool
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default n
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config LIBM_ARCH_CEIL
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_FLOOR
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_NEARBYINT
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_RINT
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_ROUND
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_TRUNC
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_CEILF
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_FLOORF
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_NEARBYINTF
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_RINTF
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_ROUNDF
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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config LIBM_ARCH_TRUNCF
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bool
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default n
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depends on LIBM && ARCH_CORTEXM33
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# One or more the of above may be selected by architecture specific logic
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if ARCH_ARM
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source libc/machine/arm/Kconfig
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endif
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if ARCH_SIM
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source libc/machine/sim/Kconfig
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endif
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if ARCH_X86
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source libc/machine/x86/Kconfig
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endif
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endmenu # Architecture-Specific Spport
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