[yocto] GCC on ARM

[Khem Raj]

On 3/30/17 9:07 PM, Gary Thomas wrote:
> [slightly off-topic]
> 
> I work with a number of embedded ARM devices, all with different
> processors, hence somewhat different tuning and build directories:
>   Raspberry-Pi (1,2,3 - mostly 3):
>     TUNE_FEATURES     = "arm armv7ve vfp thumb neon vfpv4
> callconvention-hard cortexa7"
>     build dirs:
>       tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi
>   BeagleBoneBlack:
>     TUNE_FEATURES     = "arm armv7a vfp thumb neon callconvention-hard"
>     build dirs:
>       tmp/work/armv7ahf-neon-poky-linux-gnueabi
>   i.MX6:
>     TUNE_FEATURES     = "arm armv7a vfp thumb neon callconvention-hard
> cortexa9"
>     build dirs:
>       tmp/work/cortexa9hf-neon-poky-linux-gnueabi
>       tmp/work/cortexa9hf-neon-mx6qdl-poky-linux-gnueabi
>       tmp/work/cortexa9t2hf-neon-mx6qdl-poky-linux-gnueabi
> 
> What I'm wondering is, except for the obvious programs that use SoC
> specific
> functions like the IPU/GPU on the i.MX6, how different are these
> really?  So
> much so that they have to all have unique binaries?  Surely I could build
> busybox or python and run the same binary on all three?
> 

You can chose a least common denominator and use that as DEFAULTTUNE for
all your machines. May be like armv7at2-neon

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