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arch-armv7a.inc: default to Thumb2 instruction set for armv7a and above

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Although there may still be specific cases which can benefit from the
ARM instruction set, the Thumb2 instruction set is generally a better
default for armv7a class CPUs. Distros such as Debian and Fedora have
been targeting Thumb2 by default for some time.

Note that setting ARM_INSTRUCTION_SET has no effect unless
TUNE_FEATURES contains "thumb" (which is controlled by the "t" suffix
in DEFAULTTUNE, e.g. armv7vehf-neon -vs- armv7vethf-neon, etc) so out
of tree machine configs may need to update their DEFAULTTUNE to take
advantage of this change.

(From OE-Core rev: c88304a78e528596ca481cabe273749c286c352a)

Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Andre McCurdy
2018-05-18 15:50:40 -07:00
committed by Richard Purdie
parent 16f060c56f
commit 3e7d26e31a
1 changed files with 1 additions and 0 deletions
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meta/conf/machine/include/arm/arch-armv7a.inc
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@@ -1,4 +1,5 @@
DEFAULTTUNE ?= "armv7athf"
ARM_INSTRUCTION_SET ?= "thumb"
TUNEVALID[armv7a] = "Enable instructions for ARMv7-a"
TUNECONFLICTS[armv7a] = "armv4 armv5 armv6 armv7"