[PATCH] ARM:dts:armadillo800eva: Add console parametters

[PATCH] ARM:dts:armadillo800eva: Add console parametters

[Bui Duc Phuc (Fukuda)]

From: Bui Duc Phuc <phucduc.bui@gmail.com>

Hi, Everyone!  

I have a patch for the armadillo board device-tree.
Please consider this patch.

Best regards.

Bui Duc Phuc (1):
  ARM:dts:armadillo800eva: Add console parametters

 arch/arm/boot/dts/r8a7740-armadillo800eva.dts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

-- 
2.7.4

[PATCH] ARM:dts:armadillo800eva: Add console parametters

[Bui Duc Phuc (Fukuda)]

From: Bui Duc Phuc <phucduc.bui-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

After the kernel boot, the login prompt doesn't appear.
This patch will add console parametters to bootargs to fix it.

Signed-off-by: Bui Duc Phuc <phucduc.bui-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 arch/arm/boot/dts/r8a7740-armadillo800eva.dts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
index 1788e18..d383b37 100644
--- a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
+++ b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
@@ -24,7 +24,8 @@
 	};
 
 	chosen {
-		bootargs = "earlyprintk ignore_loglevel root=/dev/nfs ip=dhcp rw";
+		bootargs = "console=tty0 console=ttySC0,115200 earlyprintk
+				ignore_loglevel root=/dev/nfs ip=dhcp rw";
 		stdout-path = "serial0:115200n8";
 	};
 
-- 
2.7.4

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Re: [PATCH] ARM:dts:armadillo800eva: Add console parametters

[Simon Horman]

On Sun, Aug 06, 2017 at 08:55:02PM +0700, Bui Duc Phuc (Fukuda) wrote:
> From: Bui Duc Phuc <phucduc.bui@gmail.com>
> 
> After the kernel boot, the login prompt doesn't appear.
> This patch will add console parametters to bootargs to fix it.
> 
> Signed-off-by: Bui Duc Phuc <phucduc.bui@gmail.com>
> ---
>  arch/arm/boot/dts/r8a7740-armadillo800eva.dts | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
> index 1788e18..d383b37 100644
> --- a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
> +++ b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
> @@ -24,7 +24,8 @@
>  	};
>  
>  	chosen {
> -		bootargs = "earlyprintk ignore_loglevel root=/dev/nfs ip=dhcp rw";
> +		bootargs = "console=tty0 console=ttySC0,115200 earlyprintk
> +				ignore_loglevel root=/dev/nfs ip=dhcp rw";
>  		stdout-path = "serial0:115200n8";
>  	};

Hi,

this feels wrong. My understanding is that stdout-path should be enough
to get the console.

Re: [PATCH] ARM:dts:armadillo800eva: Add console parametters

[Kuninori Morimoto]

Hi Simon

>     >       chosen {
>     > -             bootargs = "earlyprintk ignore_loglevel root=/dev/nfs ip=dhcp rw";
>     > +             bootargs = "console=tty0 console=ttySC0,115200 earlyprintk
>     > +                             ignore_loglevel root=/dev/nfs ip=dhcp rw";
>     >               stdout-path = "serial0:115200n8";
>     >       };
>    
>     Hi,
>    
>     this feels wrong. My understanding is that stdout-path should be enough
>     to get the console.
(snip)
> Thank you for your comment.
> Before creating this patch, I have a patch reference of you and Geert.
> https://patchwork.kernel.org/patch/5184001/

I think he want to say here is that it needs "console=" which
is indicated by Geert on https://patchwork.kernel.org/patch/5184001/

	"Note that we have to keep the "console=ttySC1" parameter in
	chosen/bootargs, ..."

I don't have armadillo800eva anymore, so I can't test this patch.
But according to Phuc-san, there is not command prompt after boot
without this patch.

Best regards
---
Kuninori Morimoto

Re: [PATCH] ARM:dts:armadillo800eva: Add console parametters

[Geert Uytterhoeven]

Hi Morimoto-san, Phuc-san,

On Thu, Aug 10, 2017 at 10:12 AM, Kuninori Morimoto
<kuninori.morimoto.gx@renesas.com> wrote:
>>     >       chosen {
>>     > -             bootargs = "earlyprintk ignore_loglevel root=/dev/nfs ip=dhcp rw";
>>     > +             bootargs = "console=tty0 console=ttySC0,115200 earlyprintk
>>     > +                             ignore_loglevel root=/dev/nfs ip=dhcp rw";
>>     >               stdout-path = "serial0:115200n8";
>>     >       };
>>
>>     Hi,
>>
>>     this feels wrong. My understanding is that stdout-path should be enough
>>     to get the console.
> (snip)
>> Thank you for your comment.
>> Before creating this patch, I have a patch reference of you and Geert.
>> https://patchwork.kernel.org/patch/5184001/
>
> I think he want to say here is that it needs "console=" which
> is indicated by Geert on https://patchwork.kernel.org/patch/5184001/
>
>         "Note that we have to keep the "console=ttySC1" parameter in
>         chosen/bootargs, ..."

        "... else we only get console messages on tty0, and because
        this DTS is shared between legacy and multi-platform."

That was needed at the time of commit 2c32622c3f3f9c7e ("ARM:
shmobile: armadillo800eva dts: Add chosen/stdout-path").

Due to generic DT/console updates later, the "console=" parameters were
no longer needed, cfr. commit 1403e38b829acdad ("ARM: dts: armadillo800eva:
Update console parameters").

> I don't have armadillo800eva anymore, so I can't test this patch.
> But according to Phuc-san, there is not command prompt after boot
> without this patch.

I'm quite sure I do get console output on both ttyS0 and tty0 with the current
kernel (can't test right now due to board farm move/restructuring).

For a userspace prompt, I guess Phuc-san uses /dev/console as the console
device in e.g. /etc/inittab (or an equivalent)? If you want a prompt on tty0,
you better specify /dev/tty0 instead of /dev/console.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds