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

[Andre Przywara]

On Fri, 7 Jan 2022 14:01:37 +0000
Mark Rutland <mark.rutland at arm.com> wrote:

Hi Mark,

> 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?

There is already:
http://lists.infradead.org/pipermail/linux-arm-kernel/2021-September/685791.html

But I think it got stuck somewhere.

Cheers,
Andre

> > [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
> >