54ee29e563
* this is mostly for backwards compatibility and to share binary feed like it was before, but now without missing different -mtune in it * if you want to build some package with -mtune add something like this to your distro config DEFAULTTUNE_qemuarm_pn-openssl = "arm926ejs" DEFAULTTUNE_qemuarmx_pn-openssl = "xscale" be aware that if you do this you should do it also for all packages which depends on openssl because if you dont and you build e.g. dhcp, then dhcp build for arm926ejs (even with DEFAULTTUNE armv5te) will depend on openssl with arm926ejs, so dhcp in armv5te feed will be rebuild after each MACHINE switch. * cortexm3, cortexr4, iwmmx and ep9312 are using own DEFAULTTUNE because they define also different -march * shared feeds are armv4t: arm920t, arm9tdmi armv5te: arm926ejs, xscale armv7a-neon: cortexa8, cortexa9 (From OE-Core rev: a11bdc36a1be18cc5aa14682b2a2c9ee83141f51) Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2012/03/30 - Mark Hatle mark.hatle@windriver.com
- Initial Revision
The individual CPU, and ABI tunings are contained in this directory. A number of local and global variables are used to control the way the tunings are setup and how they work together to specify an optimized configuration.
The following is brief summary of the generic components that are used in these tunings.
AVAILTUNES - This is a list of all of the tuning definitions currently available in the system. Not all tunes in this list may be compatible with the machine configuration, or each other in a multilib configuration. Each tuning file can add to this list using "+=", but should never replace the list using "=".
DEFAULTTUNE - This specifies the tune to use for a particular build.
Each tune should specify a reasonable default, which can be overriden by
a machine or multilib configuration. The specified tune must be listed
in the AVAILTUNES.
TUNEVALID[feature] - The is defined with a human readable explanation for what it does. All architectural, cpu, abi, etc tuning features must be defined using TUNEVALID.
TUNECONFLICTS[feature] - A list of features which conflict with . New sanity checks will try to reject combinations in which a single tuning ends up with features which conflict with each other.
TUNE_FEATURES - This is automatically defined as TUNE_FEATURES_tune-. See TUNE_FEATURES_tune- for more information.
TUNE_FEATURES_tune- - Specify the features used to describe a specific tune. This is a list of features that a tune support, each feature must be in the TUNEVALID list. Note: the tune and a given feature name may be the same, but they have different purposes. Only features may be used to change behavior, while tunes are used to describe an overall set of features.
ABIEXTENSION - An ABI extension may be specified by a specific feature
or other tuning setting, such as TARGET_FPU. Any ABI extensions either
need to be defined in the architectures base arch file, i.e.
ABIEXTENSION = "eabi" in the arm case, or appended to in specific tune
files with a ".=". Spaces are not allowed in this variable.
TUNE_CCARGS - Setup the cflags based on the TUNE_FEATURES settings.
These should be additive when defined using "+=". All items in this
list should be dynamic! i.e.
${@bb.utils.contains("TUNE_FEATURES", "feature", "cflag", "!cflag", d)}
TUNE_ARCH - The GNU canonical arch for a specific architecture. i.e.
arm, armeb, mips, mips64, etc. This value is by bitbake to setup
configure. TUNE_ARCH definitions are specific to a given architecture.
They may be a single static definitions, or may be dynamically adjusted.
See each architectures README for details for that CPU family.
TUNE_PKGARCH - The package architecture used by the packaging systems to
define the architecture, abi and tuning of a particular package.
Similarly to TUNE_ARCH, the definition of TUNE_PKGARCH is specific to
each architecture. See each architectures README for details for that
CPU family.
PACKAGE_EXTRA_ARCHS - Lists all runtime compatible package architectures. By default this is equal to PACKAGE_EXTRA_ARCHS_tune-. If an architecture deviates from the default it will be listed in the architecture README.
PACKAGE_EXTRA_ARCHS_tune- - List all of the package architectures that are compatible with this specific tune. The package arch of this tune must be in the list.
TARGET_FPU - The FPU setting for a given tune, hard (generate floating point instructions), soft (generate internal gcc calls), "other" architecture specific floating point. This is synchronized with the compiler and other toolchain items. This should be dynamically configured in the same way that TUNE_CCARGS is.
BASE_LIB_tune- - The "/lib" location for a specific ABI. This is used in a multilib configuration to place the libraries in the correct, non-conflicting locations.