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The image will be linked at a different address and with different ROM/RAM sizes to allow running a bootloder image that loads a payload image. The addresses/sizes depend on if it is a XIP image or not (CONFIG_XIP), and in the case of a XIP image, if it is a bootloader image (CONFIG_IS_BOOTLOADER) or not. In the case of a bootloader, it is given the full ROM and CONFIG_BOOTLOADER_SRAM_SIZE kB of SRAM. When not a XIP image, it is given the full SRAM minus CONFIG_BOOTLOADER_SRAM_SIZE kB, and is linked at the start of SRAM. Change-Id: Ibbb693c7bff022f313dac40f21c04a61f4bed115 Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com> Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
89 lines
2.7 KiB
Text
89 lines
2.7 KiB
Text
# Kconfig - ARM architecture configuration options
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#
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# Copyright (c) 2014-2015 Wind River Systems, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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menu "ARM architecture"
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depends on ARM
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config ARCH
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default "arm"
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config ARCH_DEFCONFIG
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string
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default "arch/arm/defconfig"
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menu "General Platform Configuration"
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choice
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prompt "SoC Selection"
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default SOC_FSL_FRDM_K64F
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source "arch/arm/soc/*/Kconfig.soc"
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endchoice
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config IS_BOOTLOADER
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bool "Act as a bootloader"
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default n
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depends on XIP
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help
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This option indicates that Zephyr will act as a bootloader to execute
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a separate Zephyr image payload.
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config BOOTLOADER_SRAM_SIZE
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int "SRAM reserved for when Zephyr acts as a bootloader"
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default 16
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depends on !XIP || IS_BOOTLOADER
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help
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This option specifies the amount of SRAM (measure in kB) reserved for
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when Zephyr is to act as a bootloader.
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config ISA_THUMB2
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bool
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# Omit prompt to signify "hidden" option
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default n
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help
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From: http://www.arm.com/products/processors/technologies/instruction-set-architectures.php
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Thumb-2 technology is the instruction set underlying the ARM Cortex
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architecture which provides enhanced levels of performance, energy
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efficiency, and code density for a wide range of embedded
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applications.
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Thumb-2 technology builds on the success of Thumb, the innovative
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high code density instruction set for ARM microprocessor cores, to
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increase the power of the ARM microprocessor core available to
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developers of low cost, high performance systems.
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The technology is backwards compatible with existing ARM and Thumb
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solutions, while significantly extending the features available to
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the Thumb instructions set. This allows more of the application to
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benefit from the best in class code density of Thumb.
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For performance optimised code Thumb-2 technology uses 31 percent
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less memory to reduce system cost, while providing up to 38 percent
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higher performance than existing high density code, which can be used
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to prolong battery-life or to enrich the product feature set. Thumb-2
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technology is featured in the processor, and in all ARMv7
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architecture-based processors.
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source "arch/arm/core/Kconfig"
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endmenu
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source "arch/arm/soc/*/Kconfig"
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endmenu
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