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These variables are used to control the floating-point instructions emitted by the go compiler for x86 architectures. The default is '387' which disables the use of sse/sse2 instructions and is safe to use on all x86 processors from the i486 onwards. If TUNE_FEATURES contains a feature set which is known to support sse/sse2 instructions then they are set to 'sse2' to enable the use of these instructions. This is suitable for most processors from Pentium 4 onwards. Only the 'core2' and 'corei7' TUNE_FEATURES are defined in the oe-core layer and are known to support ss2 instructions. Other layers may introduce additional tunings which support sse2 instructions and for these layers, TARGET_GO386 or go_map_386 should be overridden as needed. (From OE-Core rev: 7e96cf3c9850dc34d53af73a9ac22b1624994484) Signed-off-by: Paul Barker <pbarker@toganlabs.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc + qemuppc64) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.