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arm: Add new config option ARCH_VERY_EARLY_INIT

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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@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár 2022-05-06 11:05:13 +02:00 committed by Stefan Roese
parent 1001a0ab46
commit 948da7773e
2 changed files with 11 additions and 0 deletions
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6
arch/arm/Kconfig
View file

@ -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

5
arch/arm/lib/crt0.S
View file

@ -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).
*/