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From: Andre Przywara <andre.przywara@arm.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, Jaxson Han <jaxson.han@arm.com>
Subject: Re: [boot-wrapper PATCH v2 6/9] configure: Use earlycon instead of earlyprintk
Date: Fri, 7 Jan 2022 14:47:09 +0000	[thread overview]
Message-ID: <20220107144709.5cd21ab5@donnerap.cambridge.arm.com> (raw)
In-Reply-To: <YdhHwXr0pp9d+nRn@FVFF77S0Q05N>

On Fri, 7 Jan 2022 14:01:37 +0000
Mark Rutland <mark.rutland@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@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
> >   


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  parent reply	other threads:[~2022-01-07 14:48 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-22 18:15 [boot-wrapper PATCH v2 0/9] Various (build system) fixes Andre Przywara
2021-12-22 18:15 ` [boot-wrapper PATCH v2 1/9] Makefile: Avoid .got section creation Andre Przywara
2022-01-07 13:49   ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 2/9] Add standard headers Andre Przywara
2022-01-07 13:49   ` Mark Rutland
2022-01-07 14:31     ` Andre Przywara
2022-01-11 11:34       ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 3/9] Makefile: Tell compiler to generate bare-metal code Andre Przywara
2022-01-07 13:53   ` Mark Rutland
2022-01-07 14:38     ` Andre Przywara
2022-01-11 11:30       ` Mark Rutland
2022-01-18 12:52         ` Andre Przywara
2022-01-18 14:10           ` Ard Biesheuvel
2021-12-22 18:16 ` [boot-wrapper PATCH v2 4/9] configure: Make PSCI the default boot method Andre Przywara
2022-01-07 14:12   ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 5/9] configure: Fix default DTB Andre Przywara
2022-01-07 14:13   ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 6/9] configure: Use earlycon instead of earlyprintk Andre Przywara
2022-01-07 14:01   ` Mark Rutland
2022-01-07 14:14     ` Mark Rutland
2022-01-07 14:47     ` Andre Przywara [this message]
2021-12-22 18:16 ` [boot-wrapper PATCH v2 7/9] pointer auth: Document CPU feature bit mask Andre Przywara
2022-01-07 14:15   ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 8/9] configure: Autodetect GICv3 Andre Przywara
2022-01-07 14:19   ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 9/9] avoid dtc warnings on re-compiling DTB Andre Przywara
2022-01-07 13:59   ` Mark Rutland
2022-01-13 18:42   ` Vladimir Murzin
2022-01-13 19:50     ` Andre Przywara
2022-01-14  8:35       ` Vladimir Murzin
2022-01-14 10:44         ` Mark Rutland
2022-01-14 12:09           ` Andre Przywara
2022-01-19 12:02             ` Mark Rutland
2022-01-07 14:25 ` [boot-wrapper PATCH v2 0/9] Various (build system) fixes Mark Rutland

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