On Fri, May 18, 2018 at 3:50 PM Andre McCurdy <armccurdy@gmail.com> wrote:

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.

I think this is a good change and we shoudl take it in thumb2 is default ISA 

for other major distros as well 

Oe based distros who ship feeds might be affected 

Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
---
 meta/conf/machine/include/arm/arch-armv7a.inc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/meta/conf/machine/include/arm/arch-armv7a.inc b/meta/conf/machine/include/arm/arch-armv7a.inc
index bad1c27..a2663d8 100644
--- a/meta/conf/machine/include/arm/arch-armv7a.inc
+++ b/meta/conf/machine/include/arm/arch-armv7a.inc
@@ -1,4 +1,5 @@
 DEFAULTTUNE ?= "armv7athf"
+ARM_INSTRUCTION_SET ?= "thumb"

 TUNEVALID[armv7a] = "Enable instructions for ARMv7-a"
 TUNECONFLICTS[armv7a] = "armv4 armv5 armv6 armv7"
--
1.9.1

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