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Diffstat (limited to 'poky/meta/conf/machine/include/mips/README')
-rw-r--r-- | poky/meta/conf/machine/include/mips/README | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/poky/meta/conf/machine/include/mips/README b/poky/meta/conf/machine/include/mips/README new file mode 100644 index 000000000..f36e87b45 --- /dev/null +++ b/poky/meta/conf/machine/include/mips/README @@ -0,0 +1,56 @@ +2016/09/30 - Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> + - Add Release 6 support + +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 + +Release 6 of the ISA is a major revision and doesn't build up on previous +releases of the ISA. + +For more details about tuples, check https://wiki.debian.org/Multiarch/Tuples + +TUNE_ARCH, the GNU canonical arch, is defined as: + +"mips${MIPSPKGSFX_32R6}${MIPSPKGSFX_64R6}${MIPSPKGSFX_BYTE}${MIPSPKGSFX_R6}${MIPSPKGSFX_ENDIAN}" + +The package arch is defined in such a way to generated a standard naming +scheme. The scheme is: <mips variant>[-nf][-n32] + +TUNE_PKGARCH is defined as: + +${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_ENDIAN2 - For bigendian hardware this is "eb", 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. + +MIPSPKGSFX_R6 - This is used to specify the presence of release 6. +"r6" is added in the tuple for release 6 of the isa. + +MIPSPKGSFX_64R6 - This is used to specify "isa" in the tuple. +Release 6 onwards we use "mipsisa64" instead of just "mips64". + +MIPSPKGSFX_32R6 - This is used to specify "isa32" in the tuple. +Release 6 onwards we use "mipsisa32" instead of just "mips". |