223 lines
6.5 KiB
Plaintext
223 lines
6.5 KiB
Plaintext
# Kconfig - miscellany 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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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1) Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# 2) Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# 3) Neither the name of Wind River Systems nor the names of its contributors
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# may be used to endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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menu "General Setup"
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config EXPERIMENTAL
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bool
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prompt "Experimental Options"
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default n
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help
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This option enables all experimental options in the project.
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If it is disabled, all options marked as EXPERIMENTAL will
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be disabled.
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If it is enabled, all options marked as EXPERIMENTAL will
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be available for selection.
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config CROSS_COMPILE
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string "Cross-compiler tool prefix"
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help
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Same as running 'make CROSS_COMPILE=prefix-' but stored for
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default make runs in this kernel build directory. You don't
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need to set this unless you want the configured kernel build
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directory to select the cross-compiler automatically.
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menu "Compile and Link Features"
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config COMPILER_OPT
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string
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prompt "Custom compiler options"
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default ""
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help
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This option is a free-form string that is passed to the compiler
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when building all parts of a project (i.e. kernel, LKMs, and USAPs).
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The compiler options specified by this string supplement the
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pre-defined set of compiler supplied by the build system,
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and can be used to change compiler optimization, warning and error
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messages, and so on.
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A given LKM or USAP can override this setting by means of the
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OVERRIDE_COMPILER_OPT make variable in its Makefile.
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config MINIMAL_LIBC
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bool
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prompt "Build minimal c library"
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default y
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depends on !NEWLIB
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help
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Build integrated minimal c library.
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config TOOLCHAIN_NEWLIB
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bool
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prompt "Build with newlib c library"
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depends on !MINIMAL_LIBC
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default n
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help
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Build with newlib library. The newlib library is expected to be
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part of the SDK in this case.
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endmenu
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endmenu
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menu "Debugging Options"
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config PRINTK
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bool
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prompt "Send printk() to console"
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default y
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help
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This option directs printk() debugging output to the supported
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console device (UART), rather than suppressing the generation
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of printk() output entirely. Output is sent immediately, without
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any mutual exclusion or buffering.
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config STDOUT_CONSOLE
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bool
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prompt "Send stdout to console"
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default n
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help
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This option directs standard output (e.g. printf) to the console
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device, rather than suppressing in entirely.
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config ASSERT
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bool
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prompt "Enable __ASSERT() macro"
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default n
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help
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This enables the __ASSERT() macro in the kernel code. If an assertion
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fails, the calling thread is put on an infinite tight loop. Since
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enabling this adds a significant footprint, it should only be enabled
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in a non-production system.
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config ASSERT_LEVEL
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int
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prompt "__ASSERT() level"
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default 1
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depends on ASSERT
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help
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This option specifies the assertion level used by the __ASSERT()
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macro. It can be set to one of three possible values:
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Level 0: off
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Level 1: on + warning in every file that includes __assert.h
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Level 2: on + no warning
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endmenu
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menu "Bootloader Options"
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config BOOTLOADER_KEXEC
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bool
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prompt "Boot using Linux kexec() system call"
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depends on X86_32
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default n
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help
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This option signifies that Linux boots the kernel using kexec system call
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and utility. This method is used to boot the kernel over the network.
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config BOOTLOADER_GRUB
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bool
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prompt "Boot using GRUB 2.0"
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default n
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depends on !BOOTLOADER_KEXEC && X86_32
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help
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This option signifies that GRUB 2.0 is used to boot the kernel. GRUB 2.0
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is used to boot the kernel from SD card.
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config BOOTLOADER_UNKNOWN
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bool
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default n
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help
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This option signifies that the target has an unknown bootloader
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or that it supports multiple ways of booting and it isn't clear
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at build time which method is to be used. When this option is enabled
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the BSP may have to do extra work to ensure a proper startup.
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menu "Boot Sequence Options"
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depends on PROT_MODE_SWITCH_PROMPT
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config PROT_MODE_SWITCH
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bool
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prompt "Switch to 32-bit protected mode when booting"
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default n
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depends on PROT_MODE_SWITCH_PROMPT && X86_32
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help
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This option causes the kernel to transition from real mode (16-bit)
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to protected mode (32-bit) during its initial booting sequence.
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config BOOT_A20_ENABLE
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bool "Boot A20 enable"
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depends on PROT_MODE_SWITCH && X86_32
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default n
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help
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This option causes the A20 line to be enabled during the transition
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from real mode (16-bit) to protected mode (32-bit) during its initial
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booting sequence.
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endmenu
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endmenu
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menu "System Monitoring Options"
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depends on EXPERIMENTAL
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config PERFORMANCE_METRICS
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bool
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prompt "Enable performance metrics"
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default n
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depends on EXPERIMENTAL
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help
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Enable Performance Metrics.
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config BOOT_TIME_MEASUREMENT
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bool
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prompt "Boot time measurements [EXPERIMENTAL]"
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default n
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depends on EXPERIMENTAL && PERFORMANCE_METRICS
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help
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This option enables the recording of timestamps during system start
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up. The global variable __start_tsc records the time kernel begins
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executing, while __main_tsc records when main() begins executing,
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and __idle_tsc records when the CPU becomes idle. All values are
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recorded in terms of CPU clock cycles since system reset.
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config CPU_CLOCK_FREQ_MHZ
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int
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prompt "CPU CLock Frequency in MHz"
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default 20
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depends on BOOT_TIME_MEASUREMENT
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help
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This option specifies the CPU Clock Frequency in MHz in order to
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convert Intel RDTSC timestamp to microseconds.
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endmenu
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