[U-Boot] armv5 and OMAP3 Question

[Tom Rini]

On Tue, Jul 25, 2017 at 08:14:57AM -0500, Adam Ford wrote:

> The readme file for OMAP indicates that we compile using armv5 to "to
> allow more compilers to work"
> 
> We have our arch/arm/mach-omap2/omap3/lowlevel_init.S file also noting
> some special assembly insturctions becuse we use armv5.  The barriers
> defined also indicate we're using CP15 instead of the separate barrier
> instructions for armv7 because we're using armv5 instead.
> 
> I just wonder in this day and age when we're noting a GCC version and
> generating warnings based on the GCC warning, do we still need to
> compile as armv5 any more?  It seems like "to allow more compilers to
> work" would not really apply any more we're trying to push newer
> versions of GCC.

So, these are historical notes that really should be corrected.
Initially, when ARMv7 support was added, most people did not have
compilers new enough to recognize -march=armv7-a.  We still even support
them, see the logic in arch/arm/Makefile around CONFIG_CPU_V7 (the
options are any sort of modern gcc, llvm, ancient gcc).  When we move to
gcc-6 being the oldest gcc supported for ARM we can fixup those comments
and logic as well.

-- 
Tom
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