Re: [Buildroot] [PATCH 4/4] arch/Config.in: change default target architecture to AArch64

[Julien Olivain via buildroot <buildroot@buildroot.org>]

Hi Baruch, Arnout,

On 22/10/2026 11:43, Baruch Siach via buildroot wrote:
> Hi Arnout,
> 
> On Thu, Oct 22 2026, Arnout Vandecappelle via buildroot wrote:
>> On 20/10/2026 22:26, Julien Olivain via buildroot wrote:
>>> This commit switches the default target architecture in 
>>> arch/Config.in
>>> from i686 to AArch64. AArch64 is now one of the most common
>>> architecture on embedded Linux systems. The default CPU for this
>>> architecture remains the Cortex-A53 (Armv8.0).
>>> While at it, this commit also refreshes the .defconfig to:
>> 
>>  Do we even need this .defconfig file? Isn't that a leftover from 
>> very, very,
>>  very old Kconfig?
> 
> .defconfig seems to be Buildroot specific:
> 
> support/kconfig/patches/01-kconfig-kernel-to-buildroot.patch:
> Index: kconfig/confdata.c
> ===================================================================
> --- kconfig.orig/confdata.c
> +++ kconfig/confdata.c
> @@ -30,7 +30,7 @@ static void conf_message(const char *fmt
>  static const char *conf_filename;
>  static int conf_lineno, conf_warnings;
> 
> -const char conf_defname[] = "arch/$ARCH/defconfig";
> +const char conf_defname[] = ".defconfig";
> 
>  static void conf_warning(const char *fmt, ...)
>  {

This .defconfig file is still used, when running a simple
"make defconfig". If we remove it then run "make defconfig"
kconfig fails with error:

*** Can't find default configuration ".defconfig"!

Also, we can see that without the patch changing the default arch
to AArch64, running "make defconfig" generates a i686 config.
With the patch, we then have a aarch64 config.

There was indeed ancient leftovers in this .defconfig file.

> 
> baruch
> 
> --
>                                                      ~. .~   Tk Open 
> Systems
> =}------------------------------------------------ooO--U--Ooo------------{=
>    - baruch@tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -

Best regards,

Julien.
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