Cleanup the MIPS tunings to match the new tuning README file. Also add a MIPS specific README file to explain the MIPS specifical architectural issues. Finally correct the variant configurations within the tune-mips32.inc. (From OE-Core rev: efbfa2ace3362393a20340af93e8dcab17a8619a) Signed-off-by: Mark Hatle <mark.hatle@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
37 lines
1.2 KiB
Text
37 lines
1.2 KiB
Text
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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TUNE_ARCH, the GNU canonical arch, is defined as:
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mips${MIPSPKGSFX_BYTE}${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_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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