[Buildroot] [PATCH 2/2] package/xenomai: disable cobalt for armv8

[Yann E. MORIN]

Romain, All,

On 2021-02-02 21:56 +0100, Romain Naour spake thusly:
> When a armv8 target is used in 32bits mode, xenomai fail to
> detect the ARM architecture and abord the build.
> (__ARM_ARCH_7A__ is not defined for armv8 cpus).
> 
> There are no autobuilder failures for this issue since cobalt
> is never selected, but the following defconfig:
> 
> BR2_arm=y
> BR2_cortex_a53=y
> BR2_ARM_FPU_NEON_VFPV4=y
> BR2_TOOLCHAIN_EXTERNAL=y
> BR2_PACKAGE_XENOMAI=y
> BR2_PACKAGE_XENOMAI_COBALT=y
> 
> This was initialy reproduced using the raspberrypi3_defconfig
> with Xenomai package with cobalt selected.
> 
> In order to use Xenomai on raspberrypi3 in 32 bits mode,
> you have to select BR2_cortex_a7. This partially revert the
> commit a13a388dd444ee047f0e7b8c10f5e6c235ec5004.
> 
> See:
> https://gitlab.denx.de/Xenomai/xenomai/-/blob/v3.1/lib/cobalt/arch/arm/include/asm/xenomai/features.h#L52
> 
> Signed-off-by: Romain Naour <romain.naour at gmail.com>
> ---
>  package/xenomai/Config.in | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/package/xenomai/Config.in b/package/xenomai/Config.in
> index b1b02373c3..e060bcc46f 100644
> --- a/package/xenomai/Config.in
> +++ b/package/xenomai/Config.in
> @@ -1,8 +1,8 @@
>  config BR2_PACKAGE_XENOMAI_COBALT_ARCH_SUPPORTS
>  	bool
>  	default y
> -	depends on BR2_i386 || BR2_x86_64 || (BR2_arm && !BR2_ARM_CPU_ARMV7M) || \
> -		BR2_powerpc
> +	depends on BR2_i386 || BR2_x86_64 || BR2_powerpc || \
> +		(BR2_arm && !BR2_ARM_CPU_ARMV7M && !BR2_ARM_CPU_ARMV8A)

This condition is starting to look pretty ugly, now... I've changed that
to a series of conditional 'default y if $ARCH' statements instead.

Applied to master, thanks.

Regards,
Yann E. MORIN.

>  comment "xenomai needs a glibc or uClibc toolchain w/ threads"
>  	depends on BR2_USE_MMU
> -- 
> 2.29.2
> 
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