[cfarm-users] Is there any computer with armhf architecture on cfarm? - thank you

[Jeffrey Walton]

On Mon, Jul 7, 2025 at 11:34 AM Jaroslav Fojtik via cfarm-users
<cfarm-users at lists.tetaneutral.net> wrote:
>
> [...]
> > On 06/07/25 09:54, Jaroslav Fojtik via cfarm-users wrote:
> > > Is there any accessible computer with armhf architecture on cfarm?
> > armhf isn'r a hardware type, it's the Debian name for their repo
> > compiled for the armv7 with hardware VFP math instructions.
> I did not know what is it.
>
> My first question contained this link:
> https://launchpadlibrarian.net/802217984/buildlog_ubuntu-questing-armhf.wp2latex_4.15~ds-1
> _BUILDIN
> > G.txt.gz
> > Ubuntu-Bug: https://bugs.launchpad.net/ubuntu/+source/wp2latex/+bug/2115809
> It is clear that it is meant UBUNTU.
>
> --------
>
> I hope that I do not need this platform anymore.
> First answer from Paul was helpful.
>
> #I am not aware of any armhf hardware.
> #However, at least some of the aarch64 systems have the necessary
> #cross-compilers to build armhf executables, and can execute them natively.
> #A trivial demo on cfarm117 appears below.
>
> I has been traced defines and it seems that main problem was unalligned access.
> Ability to access unalligned variables is signelized by this macro:
> __ARM_FEATURE_UNALIGNED
>
>  #if !defined(NATIVE_ACCESS) && !defined(HI_ENDIAN) && !defined(__ARM_FEATURE_UNALIGNED)
>   #define NATIVE_ACCESS
>  #endif
>
> It is all I need.

You should ignore __ARM_FEATURE_UNALIGNED, and write portable code.
Unaligned access will result in a SIGBUS on ARMv5, if I recall
correctly (and __ARM_FEATURE_UNALIGNED should not be defined).
However, on later architectures, like ARMv6 or ARMv7, there is
sometimes a performance penalty for the unaligned access.  Finally,
GCC and Clang sanitizers will produce a finding for unaligned access.

If you want or need access to an ARMv7 dev board, try a Raspberry Pi
2. The RPI2 is ARMv7.

Jeff