[yocto] GCC on ARM

[Khem Raj]

On 3/30/17 10:33 PM, Gary Thomas wrote:
> On 2017-03-31 07:07, Khem Raj wrote:
>>
>>
>> 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
> 
> That's good to know, thanks.
> 
> What would I be giving up?  Anything of substance/importance?
> 

I doubt anything. Optimizations are oversell.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 204 bytes
Desc: OpenPGP digital signature
URL: <http://lists.yoctoproject.org/pipermail/yocto/attachments/20170331/6186ab80/attachment.pgp>