[Buildroot] [PATCH v3 4/4] linux: config.in: add comment for Arm Cortex-M

[Yann E. MORIN <yann.morin.1998@free.fr>]

Christophe, All,

On 2018-05-31 13:21 +0000, Christophe PRIOUZEAU spake thusly:
> When binutils > 2.28 are selected on Arm Cortex-M cpu,
> linux kernel does not boot due to a new implementation
> of 'adr pseudo instruction' on binutils.
> 
> Bugzilla thread: https://bugs.busybox.net/show_bug.cgi?id=11051
> 
> Signed-off-by: Christophe Priouzeau <christophe.priouzeau@st.com>
> ---
> Changes v1 -> v2
>  - correct depends on for comment
> 
> Changes v2 -> v3
>  - use correct TAG BR2_ARM_CPU_ARMV7M
>  - invert depends for BR2_ARM_CPU_ARMV7M
> 
>  linux/Config.in | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/linux/Config.in b/linux/Config.in
> index 73a3299..b5957b6 100644
> --- a/linux/Config.in
> +++ b/linux/Config.in
> @@ -8,6 +8,10 @@ config BR2_LINUX_KERNEL
>  
>  if BR2_LINUX_KERNEL
>  
> +comment "Linux kernel will not boot with binutils >= 2.29"
> +	depends on BR2_ARM_CPU_ARMV7M

So, my understanding was that the build in Thuimb mode was what was
causing the issue, rather than the actual architecture.

So, if one has (say) a Cortex-A9, and decides to build in Thumb mode, as
well as build its kernel in Thumb mode, wouldn't that also trigger the
issue as well?

Regards,
Yann E. MORIN.

> +	depends on !BR2_BINUTILS_VERSION_2_28_X
> +
>  # Packages that need to have a kernel with support for loadable modules,
>  # but do not use the kernel-modules infrastructure, should select that
>  # option.
> -- 
> 2.7.4
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