[U-Boot] arm: arm64: only use general regs

[Tom Rini]

On Tue, Nov 28, 2017 at 10:09:37AM +0800, Peng Fan wrote:

> When compiling with android toolchain, there is an instruction
> "str     q0, [x8],#16", but x8 is not 16bytes aligned,
> this instruction will trigger sync abort.
> 
> So, following Linux kernel, only use general regs for arm64.
> If not, compiler may use simd registers Q[x]. We need to avoid
> using simd registers in U-Boot, because load/store Q[x] has
> restriction that 128bits aligned when str/ldr.
> 
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

This breaks s32v234evb building, please look into that, thanks!

-- 
Tom
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