[boot-wrapper PATCH v2 6/9] configure: Use earlycon instead of earlyprintk

[Mark Rutland]

On Wed, Dec 22, 2021 at 06:16:04PM +0000, Andre Przywara wrote:
> The arm64 Linux kernel dropped support for the "earlyprintk" command line
> parameter a long time ago[1], instead it uses the earlycon parameter
> now.
> 
> Replace earlyprintk with earlycon on the default command line, to see
> early kernel output.
> 
> Ideally we would just say "earlycon" (without specifying an MMIO
> address), but this relies on the stdout-path property in the /chosen
> node, which the model DTs do not carry.

Can we send a Linux patch to add that?

Mark.

> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8ef0ed95ee04
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
>  configure.ac | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/configure.ac b/configure.ac
> index 2b295de..9e3b722 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -99,7 +99,7 @@ AC_SUBST([FILESYSTEM], [$USE_INITRD])
>  AM_CONDITIONAL([INITRD], [test "x$USE_INITRD" != "x"])
>  
>  AS_IF([test "x$X_IMAGE" = "x"],[C_CONSOLE="ttyAMA0"],[C_CONSOLE="hvc0"])
> -C_CMDLINE="console=$C_CONSOLE earlyprintk=pl011,0x1c090000"
> +C_CMDLINE="console=$C_CONSOLE earlycon=pl011,0x1c090000"
>  AC_ARG_WITH([cmdline],
>  	AS_HELP_STRING([--with-cmdline], [set a command line for the kernel]),
>  	[C_CMDLINE=$withval])
> -- 
> 2.25.1
>