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 --- 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). */