[PATCH 1/5] arm: Add new config option ARCH_VERY_EARLY_INIT

[Stefan Roese]

On 06.05.22 11:05, Pali Rohár wrote:
> When this option is set then ARM _main() function would call
> arch_very_early_init() function at the beginning. It would be before
> calling any other functions like debug_uart_init() and also before
> initializing C runtime environment.
> 
> Signed-off-by: Pali Rohár <pali at kernel.org>

Reviewed-by: Stefan Roese <sr at denx.de>

Thanks,
Stefan

> ---
>   arch/arm/Kconfig    | 6 ++++++
>   arch/arm/lib/crt0.S | 5 +++++
>   2 files changed, 11 insertions(+)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 0afec5155b1b..9898c7d68e1b 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -401,6 +401,12 @@ config SYS_ARM_CACHE_WRITEALLOC
>   	  write is performed.
>   endchoice
>   
> +config ARCH_VERY_EARLY_INIT
> +	bool
> +
> +config SPL_ARCH_VERY_EARLY_INIT
> +	bool
> +
>   config ARCH_CPU_INIT
>   	bool "Enable ARCH_CPU_INIT"
>   	help
> diff --git a/arch/arm/lib/crt0.S b/arch/arm/lib/crt0.S
> index ba312901f331..612a2d5b698e 100644
> --- a/arch/arm/lib/crt0.S
> +++ b/arch/arm/lib/crt0.S
> @@ -90,6 +90,11 @@ clbss_l:cmp	r0, r1			/* while not at end of BSS */
>   
>   ENTRY(_main)
>   
> +/* Call arch_very_early_init before initializing C runtime environment. */
> +#if CONFIG_IS_ENABLED(ARCH_VERY_EARLY_INIT)
> +	bl	arch_very_early_init
> +#endif
> +
>   /*
>    * Set up initial C runtime environment and call board_init_f(0).
>    */

Viele Grüße,
Stefan Roese

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