[OE-core] [PATCH] tune-corei7.inc: tell qemu to emulate a matching processor

[Andre McCurdy]

On Mon, Feb 8, 2016 at 7:16 AM, Ross Burton <ross.burton at intel.com> wrote:
> If tune-corei7 is in use then the target binaries may contain instructions that
> qemu-x86-64 can't execute by default, resulting in errors on rootfs construction:
>
> NOTE: Running intercept scripts:
> NOTE: > Executing update_font_cache intercept ...
> qemu: uncaught target signal 4 (Illegal instruction) - core dumped
>
> In this case the instruction is popcnt, part of SSE4.2, so tell Qemu to emulate
> the CPU that the tune targets (in this case, Nehalem).
>
> [ YOCTO #8888 ]
>
> Signed-off-by: Ross Burton <ross.burton at intel.com>
> ---
>  meta/conf/machine/include/tune-corei7.inc | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/meta/conf/machine/include/tune-corei7.inc b/meta/conf/machine/include/tune-corei7.inc
> index d245d9f..197558f 100644
> --- a/meta/conf/machine/include/tune-corei7.inc
> +++ b/meta/conf/machine/include/tune-corei7.inc
> @@ -11,6 +11,8 @@ DEFAULTTUNE ?= "corei7-64"
>  # Pull in the previous tune in to pull in PACKAGE_EXTRA_ARCHS
>  require conf/machine/include/tune-core2.inc
>
> +QEMU_EXTRAOPTIONS_corei7-64 = " -cpu Nehalem,check=false"

What about corei7-32 and corei7-64-x32 ?

>  # Extra tune features
>  TUNEVALID[corei7] = "Enable corei7 specific processor optimizations"
>  TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'corei7', ' -march=corei7 -mtune=corei7 -mfpmath=sse -msse4.2', '', d)}"
> --
> 2.7.0
>
> --
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