[Buildroot] [PATCH] board/qemu/aarch64: add a aarch64 virt machine using an ARM cortex-a72 core

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello Romain,

On Tue,  7 May 2019 13:25:21 +0200
Romain Naour <romain.naour@smile.fr> wrote:

> ARM cortex-a72 core has been added to Qemu since version 3.1.0 [1] [2].

Do we really want a different defconfig for each possible ARM core that
Qemu emulates ?

> Qemu also support ARM cortex-a57 cpu core.
> Should we support and test all cpu emulation available in Qemu ?
> This can be useful for toolchain-builder project to provide a prebuilt ARM aarch64
> toolchain optimized for cortex-a57.

I'm not sure the toolchain builder project requires exactly a Qemu
emulating the specific optimization for which gcc was built. I.e, a
Cortex-A53 qemu defconfig can be used to boot test a Cortex-A57 or A72
optimized toolchain.

We're already doing that for example with ARMv5/v6/v7:

    armv5-* | armv6-* | armv7-*)
        test_defconfig="qemu_arm_vexpress_defconfig"
        test_board_dir="arm-vexpress"

Or for x86:

    x86-core2)
        test_defconfig="qemu_x86_defconfig"
    x86-i686)
        test_defconfig="qemu_x86_defconfig"

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com