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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 | |||
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1 | 2012/03/30 - Mark Hatle <mark.hatle@windriver.com> | ||
2 | - Initial Version | ||
3 | |||
4 | MIPS currently defines 12 ABIs. Combinations of: | ||
5 | *) Big/Little Endian | ||
6 | *) Hardware/Software Floating Point | ||
7 | *) o32, n32, n64 ABI | ||
8 | |||
9 | TUNE_ARCH, the GNU canonical arch, is defined as: | ||
10 | |||
11 | mips${MIPSPKGSFX_BYTE}${MIPSPKGSFX_ENDIAN} | ||
12 | |||
13 | The package arch is defined in such a way to generated a standard naming | ||
14 | scheme. The scheme is: <mips variant>[-nf][-n32] | ||
15 | |||
16 | TUNE_PKGARCH is defined as: | ||
17 | |||
18 | ${MIPSPKGSFX_VARIANT_tune-${DEFAULTTUNE}}${MIPSPKGSFX_FPU}${MIPSPKGSFX_ABI} | ||
19 | |||
20 | The following is a list of MIPS specific variables: | ||
21 | |||
22 | MIPSPKGSFX_BYTE - This is defined as either blank and "64" for MIPS64 CPUs. | ||
23 | |||
24 | MIPSPKGSFX_ENDIAN - For bigendian hardware this is blank, otherwise it's | ||
25 | defined as "el". | ||
26 | |||
27 | MIPSPKGSFX_VARIANT_tune-<tune> - In the default tunings it is set to the | ||
28 | same value as TUNE_ARCH. In custom, optimized tunings, the value should | ||
29 | be modified to more precisely describe the tuning. | ||
30 | |||
31 | MIPSPKGSFX_FPU - The value is set to "" or "-nf", where "-nf" indicates | ||
32 | that the tune is using a non-floating point ABI. | ||
33 | |||
34 | MIPSPKGSFX_ABI - This is used to specify an alternative ABI when the previous | ||
35 | values are not enough to distringuish the package. "-n32" is added when | ||
36 | building for N32 ABI. | ||