Enable Thumb for Aspeed 2400

[Huy Duong]

Hi all,

On Aspeed 2400, /proc/cpuinfo shows that Thumb is supported. But look
like thumb is currently not enabled in Yocto.

I tried to add "ARMPKGSFX_THUMB = "t"" to
meta-openbmc-bsp/meta-aspeed/meta-ast2400/conf/machine/include/ast2400.inc
and see that everything still works well.

Is there any reason why Thumb is not enabled by default? I think Thumb
can help to improve performance a lot.

-- 
Thanks and best regards,
Huy Duong

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