| # Kconfig - miscellany 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 |
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| # POSSIBILITY OF SUCH DAMAGE. |
| # |
| |
| config PRINTK |
| bool |
| prompt "Send printk() to console" |
| default y |
| help |
| This option directs printk() debugging output to the supported |
| console device (UART), rather than suppressing the generation |
| of printk() output entirely. Output is sent immediately, without |
| any mutual exclusion or buffering. |
| |
| |
| menu "General Setup" |
| config EXPERIMENTAL |
| bool |
| prompt "Experimental Options" |
| default n |
| help |
| This option enables all experimental options in the project. |
| If it is disabled, all options marked as EXPERIMENTAL will |
| be disabled. |
| If it is enabled, all options marked as EXPERIMENTAL will |
| be available for selection. |
| config CROSS_COMPILE |
| string "Cross-compiler tool prefix" |
| help |
| Same as running 'make CROSS_COMPILE=prefix-' but stored for |
| default make runs in this kernel build directory. You don't |
| need to set this unless you want the configured kernel build |
| directory to select the cross-compiler automatically. |
| |
| menu "Compile and Link Features" |
| |
| config COMPILER_OPT |
| string |
| prompt "Custom compiler options" |
| default "" |
| help |
| This option is a free-form string that is passed to the compiler |
| when building all parts of a project (i.e. kernel, LKMs, and USAPs). |
| The compiler options specified by this string supplement the |
| pre-defined set of compiler supplied by the build system, |
| and can be used to change compiler optimization, warning and error |
| messages, and so on. |
| |
| A given LKM or USAP can override this setting by means of the |
| OVERRIDE_COMPILER_OPT make variable in its Makefile. |
| |
| config MINIMAL_LIBC |
| bool |
| prompt "Build minimal c library" |
| default y |
| depends on !NEWLIB |
| help |
| Build integrated minimal c library. |
| |
| config TOOLCHAIN_NEWLIB |
| bool |
| prompt "Build with newlib c library" |
| depends on !MINIMAL_LIBC |
| default n |
| help |
| Build with newlib library. The newlib library is expected to be |
| part of the SDK in this case. |
| endmenu |
| endmenu |
| |
| menu "Debugging Options" |
| |
| config STDOUT_CONSOLE |
| bool |
| prompt "Send stdout to console" |
| default n |
| help |
| This option directs standard output (e.g. printf) to the console |
| device, rather than suppressing in entirely. |
| |
| config ASSERT |
| bool |
| prompt "Enable __ASSERT() macro" |
| default n |
| help |
| This enables the __ASSERT() macro in the kernel code. If an assertion |
| fails, the calling thread is put on an infinite tight loop. Since |
| enabling this adds a significant footprint, it should only be enabled |
| in a non-production system. |
| |
| config ASSERT_LEVEL |
| int |
| prompt "__ASSERT() level" |
| default 1 |
| depends on ASSERT |
| help |
| This option specifies the assertion level used by the __ASSERT() |
| macro. It can be set to one of three possible values: |
| |
| Level 0: off |
| Level 1: on + warning in every file that includes __assert.h |
| Level 2: on + no warning |
| |
| endmenu |
| |
| menu "System Monitoring Options" |
| |
| |
| config PERFORMANCE_METRICS |
| bool |
| prompt "Enable performance metrics" |
| default n |
| depends on EXPERIMENTAL |
| help |
| Enable Performance Metrics. |
| |
| config BOOT_TIME_MEASUREMENT |
| bool |
| prompt "Boot time measurements [EXPERIMENTAL]" |
| default n |
| depends on EXPERIMENTAL && PERFORMANCE_METRICS |
| help |
| This option enables the recording of timestamps during system start |
| up. The global variable __start_tsc records the time kernel begins |
| executing, while __main_tsc records when main() begins executing, |
| and __idle_tsc records when the CPU becomes idle. All values are |
| recorded in terms of CPU clock cycles since system reset. |
| |
| config CPU_CLOCK_FREQ_MHZ |
| int |
| prompt "CPU CLock Frequency in MHz" |
| default 20 |
| depends on BOOT_TIME_MEASUREMENT |
| help |
| This option specifies the CPU Clock Frequency in MHz in order to |
| convert Intel RDTSC timestamp to microseconds. |
| |
| endmenu |
| |
