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Diffstat (limited to 'meta/conf/machine/include/mips/README')
| -rw-r--r-- | meta/conf/machine/include/mips/README | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/meta/conf/machine/include/mips/README b/meta/conf/machine/include/mips/README new file mode 100644 index 0000000000..c375f316df --- /dev/null +++ b/meta/conf/machine/include/mips/README @@ -0,0 +1,36 @@ +2012/03/30 - Mark Hatle <mark.hatle@windriver.com> + - Initial Version + +MIPS currently defines 12 ABIs. Combinations of: + *) Big/Little Endian + *) Hardware/Software Floating Point + *) o32, n32, n64 ABI + +TUNE_ARCH, the GNU canonical arch, is defined as: + +mips${MIPSPKGSFX_BYTE}${MIPSPKGSFX_ENDIAN} + +The package arch is defined in such a way to generated a standard naming +scheme. The scheme is: <mips variant>[-nf][-n32] + +TUNE_PKGARCH is defined as: + +${MIPSPKGSFX_VARIANT_tune-${DEFAULTTUNE}}${MIPSPKGSFX_FPU}${MIPSPKGSFX_ABI} + +The following is a list of MIPS specific variables: + +MIPSPKGSFX_BYTE - This is defined as either blank and "64" for MIPS64 CPUs. + +MIPSPKGSFX_ENDIAN - For bigendian hardware this is blank, otherwise it's +defined as "el". + +MIPSPKGSFX_VARIANT_tune-<tune> - In the default tunings it is set to the +same value as TUNE_ARCH. In custom, optimized tunings, the value should +be modified to more precisely describe the tuning. + +MIPSPKGSFX_FPU - The value is set to "" or "-nf", where "-nf" indicates +that the tune is using a non-floating point ABI. + +MIPSPKGSFX_ABI - This is used to specify an alternative ABI when the previous +values are not enough to distringuish the package. "-n32" is added when +building for N32 ABI. |