[Buildroot] [PATCH V3 03/10] arch/csky: Add FLOAT_ABI compiler options

[Guo Ren]

On Wed, May 29, 2019 at 3:23 PM Thomas Petazzoni
<thomas.petazzoni at bootlin.com> wrote:
>
> Hello,
>
> On Wed, 29 May 2019 15:18:41 +0800
> guoren at kernel.org wrote:
>
> > From: Guo Ren <ren_guo at c-sky.com>
> >
> > This is only for abiv2 and abiv1 don't support FPU.
> >
> > Signed-off-by: Guo Ren <ren_guo at c-sky.com>
>
> What is abiv1 vs. abiv2 ? Also, in your next commit, abiv1 is
> apparently used for ck610, but here this BR2_GCC_TARGET_FLOAT_ABI is
> defined for all cases, which seems to contradict your commit log.
abiv1 contain: ck610
abiv2 contain: ck807 ck810 ck860

Abiv1 is almost the same as mcore and it's ELF_CODE is 39
Abiv2 is C-SKY own ISA and it's ELF_CODE is 252

We don't support FPU in abiv1, because its opcode width is only
16-bits and we don't want
to continue developing it.

Best Regards
 Guo Ren