forked from brl/citadel
57 lines
2.0 KiB
Plaintext
57 lines
2.0 KiB
Plaintext
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2016/09/30 - Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
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- Add Release 6 support
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2012/03/30 - Mark Hatle <mark.hatle@windriver.com>
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- Initial Version
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MIPS currently defines 12 ABIs. Combinations of:
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*) Big/Little Endian
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*) Hardware/Software Floating Point
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*) o32, n32, n64 ABI
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Release 6 of the ISA is a major revision and doesn't build up on previous
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releases of the ISA.
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For more details about tuples, check https://wiki.debian.org/Multiarch/Tuples
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TUNE_ARCH, the GNU canonical arch, is defined as:
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"mips${MIPSPKGSFX_32R6}${MIPSPKGSFX_64R6}${MIPSPKGSFX_BYTE}${MIPSPKGSFX_R6}${MIPSPKGSFX_ENDIAN}"
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The package arch is defined in such a way to generated a standard naming
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scheme. The scheme is: <mips variant>[-nf][-n32]
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TUNE_PKGARCH is defined as:
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${MIPSPKGSFX_VARIANT_tune-${DEFAULTTUNE}}${MIPSPKGSFX_FPU}${MIPSPKGSFX_ABI}
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The following is a list of MIPS specific variables:
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MIPSPKGSFX_BYTE - This is defined as either blank and "64" for MIPS64 CPUs.
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MIPSPKGSFX_ENDIAN - For bigendian hardware this is blank, otherwise it's
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defined as "el".
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MIPSPKGSFX_ENDIAN2 - For bigendian hardware this is "eb", otherwise it's
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defined as "el".
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MIPSPKGSFX_VARIANT_tune-<tune> - In the default tunings it is set to the
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same value as TUNE_ARCH. In custom, optimized tunings, the value should
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be modified to more precisely describe the tuning.
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MIPSPKGSFX_FPU - The value is set to "" or "-nf", where "-nf" indicates
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that the tune is using a non-floating point ABI.
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MIPSPKGSFX_ABI - This is used to specify an alternative ABI when the previous
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values are not enough to distringuish the package. "-n32" is added when
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building for N32 ABI.
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MIPSPKGSFX_R6 - This is used to specify the presence of release 6.
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"r6" is added in the tuple for release 6 of the isa.
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MIPSPKGSFX_64R6 - This is used to specify "isa" in the tuple.
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Release 6 onwards we use "mipsisa64" instead of just "mips64".
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MIPSPKGSFX_32R6 - This is used to specify "isa32" in the tuple.
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Release 6 onwards we use "mipsisa32" instead of just "mips".
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