zephyr/arch/arm/Kconfig

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# Kconfig - ARM architecture configuration options
#
# Copyright (c) 2014-2015 Wind River Systems, Inc.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1) Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2) Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3) Neither the name of Wind River Systems nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
source "kernel/Kconfig"
source "misc/Kconfig"
menu "ARM family options"
config ARM
bool
default y
help
This option signifies the use of an ARM system.
config XIP
default n
config ISA_THUMB2
bool "Thumb-2 Technology"
default y
help
From: http://www.arm.com/products/processors/technologies/instruction-set-architectures.php
Thumb-2 technology is the instruction set underlying the ARM Cortex
architecture which provides enhanced levels of performance, energy
efficiency, and code density for a wide range of embedded
applications.
Thumb-2 technology builds on the success of Thumb, the innovative
high code density instruction set for ARM microprocessor cores, to
increase the power of the ARM microprocessor core available to
developers of low cost, high performance systems.
The technology is backwards compatible with existing ARM and Thumb
solutions, while significantly extending the features available to
the Thumb instructions set. This allows more of the application to
benefit from the best in class code density of Thumb.
For performance optimised code Thumb-2 technology uses 31 percent
less memory to reduce system cost, while providing up to 38 percent
higher performance than existing high density code, which can be used
to prolong battery-life or to enrich the product feature set. Thumb-2
technology is featured in the processor, and in all ARMv7
architecture-based processors.
endmenu
source "arch/arm/bsp/Kconfig"
if BSP_TI_LM3S6965
source "arch/arm/ti_lm3s6965/Kconfig"
endif
if BSP_FSL_FRDM_K64F
source "arch/arm/fsl_frdm_k64f/Kconfig"
endif
source "drivers/Kconfig"
source "net/Kconfig"