linux-kernel - Re: [PATCH] arm: dt: Initialize boot_command_line from CONFIG_CMDLINE in case DT does not provide /chosen/bootargs

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Message-ID: <CABxcv=n=FOFedS9vF9qf68PAWy3YQoAMHJcgiG9TiaLrDOZXDw@mail.gmail.com>
Date:   Wed, 14 Dec 2016 19:22:46 -0300
From:   Javier Martinez Canillas <javier@...hile0.org>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Robin Murphy <robin.murphy@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Ben Dooks <ben-linux@...ff.org>,
        Tony Lindgren <tony@...mide.com>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Pavel Machek <pavel@....cz>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm: dt: Initialize boot_command_line from CONFIG_CMDLINE
 in case DT does not provide /chosen/bootargs

Hello Pali,

On Wed, Dec 14, 2016 at 6:12 PM, Pali Rohár <pali.rohar@...il.com> wrote:
> Commit 008a2ebcd677 ("ARM: dts: omap3: Remove skeleton.dtsi usage") broke
> support for setting cmdline on Nokia N900 via CONFIG_CMDLINE.
>

This commit really exposed the issue rather than causing it. But since
it was working before due including skeleton.dtsi which defines an
empty chosen node, I think that you should add a:

Fixes: 008a2ebcd677 ("ARM: dts: omap3: Remove skeleton.dtsi usage")

> It is because arm code booted in DT mode parse cmdline only via function
> early_init_dt_scan_chosen() and that function does not fill variable
> boot_command_line when DTB does not contain /chosen entry. It is called
> from function early_init_dt_scan_nodes() in setup_machine_fdt().
>
> This patch fixes it by explicitly filling boot_command_line in function
> setup_machine_fdt() after calling early_init_dt_scan_nodes() in case
> boot_command_line still remains empty.
>
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> ---

Best regards,
Javier