[PATCH 1/2] autoboot: allow custom prompt without requiring AUTOBOOT_KEYED

[Ferass El Hafidi]

On Mon, 06 Apr 2026 15:30, Tom Rini <trini at konsulko.com> wrote:
>On Sun, Apr 05, 2026 at 10:49:04AM +0000, Ferass El Hafidi wrote:
>
>> The autoboot prompt used to only be customizable in Kconfig when
>> AUTOBOOT_KEYED was enabled. For a usecase such as having a nicer
>> autoboot prompt alongside a splash screen, there is no reason for
>> AUTOBOOT_KEYED to be required for this.
>> 
>> Remove the dependency to AUTOBOOT_KEYED, and use AUTOBOOT_PROMPT in
>> print_boot_delay() instead of a hardcoded string.
>> 
>> Signed-off-by: Ferass El Hafidi <funderscore at postmarketos.org>
>> ---
>>  boot/Kconfig      | 31 ++++++++++++++++---------------
>>  common/autoboot.c |  4 +++-
>>  2 files changed, 19 insertions(+), 16 deletions(-)
>> 
>> diff --git a/boot/Kconfig b/boot/Kconfig
>> index bfed452d77e..6c8ec356996 100644
>> --- a/boot/Kconfig
>> +++ b/boot/Kconfig
>> @@ -1560,6 +1560,22 @@ config AUTOBOOT
>>  	help
>>  	  This enables the autoboot.  See doc/README.autoboot for detail.
>>  
>> +config AUTOBOOT_PROMPT
>> +	string "Autoboot stop prompt"
>> +	default "Autoboot in %d seconds\\n" if AUTOBOOT_KEYED
>> +	default "\\rHit any key to stop autoboot: %d"
>> +	help
>> +	  This string is displayed before the boot delay selected by
>> +	  CONFIG_BOOTDELAY starts. If it is not defined	there is no
>> +	  output indicating that autoboot is in progress.
>> +
>> +	  Note that this define is used as the (only) argument to a
>> +	  printf() call, so it may contain '%' format specifications,
>> +	  provided that it also includes, separated by commas exactly
>> +	  like in a printf statement, the required arguments. It is
>> +	  the responsibility of the user to select only such arguments
>> +	  that are valid in the given context.
>> +
>>  if AUTOBOOT
>>  
>>  config BOOTDELAY
>> @@ -1597,21 +1613,6 @@ config AUTOBOOT_FLUSH_STDIN
>>  	  This can't be enabled for the sandbox as flushing stdin would
>>  	  break the autoboot unit tests.
>>  
>> -config AUTOBOOT_PROMPT
>> -	string "Autoboot stop prompt"
>> -	default "Autoboot in %d seconds\\n"
>> -	help
>> -	  This string is displayed before the boot delay selected by
>> -	  CONFIG_BOOTDELAY starts. If it is not defined	there is no
>> -	  output indicating that autoboot is in progress.
>> -
>> -	  Note that this define is used as the (only) argument to a
>> -	  printf() call, so it may contain '%' format specifications,
>> -	  provided that it also includes, separated by commas exactly
>> -	  like in a printf statement, the required arguments. It is
>> -	  the responsibility of the user to select only such arguments
>> -	  that are valid in the given context.
>> -
>>  config AUTOBOOT_ENCRYPTION
>>  	bool "Enable encryption in autoboot stopping"
>>  	help
>> diff --git a/common/autoboot.c b/common/autoboot.c
>> index 1783ef92c94..d12d618fea3 100644
>> --- a/common/autoboot.c
>> +++ b/common/autoboot.c
>> @@ -379,7 +379,9 @@ static int abortboot_key_sequence(int bootdelay)
>>  
>>  static void print_boot_delay(int bootdelay)
>>  {
>> -	printf(ANSI_CLEAR_LINE "\rHit any key to stop autoboot: %d", bootdelay);
>> +#ifdef CONFIG_AUTOBOOT_PROMPT
>> +	printf(ANSI_CLEAR_LINE CONFIG_AUTOBOOT_PROMPT, bootdelay);
>> +#endif
>>  }
>>  
>>  static int abortboot_single_key(int bootdelay)
>
>We shouldn't need to guard this, as it's always prompted for now during
>configuration, yes?
>

I did this in case it happened to be unset, and also to provide a way to
silence the prompt entirely.

Best regards,
Ferass