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: <201612161713.46770@pali>
Date:   Fri, 16 Dec 2016 17:13:46 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Javier Martinez Canillas <javier@....samsung.com>,
        "Russell King - ARM Linux" <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>,
        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-kernel@...r.kernel.org
Subject: Re: [PATCH] arm: dt: Initialize boot_command_line from CONFIG_CMDLINE in case DT does not provide /chosen/bootargs

On Friday 16 December 2016 16:40:30 Tony Lindgren wrote:
> * Javier Martinez Canillas <javier@....samsung.com> [161216 04:54]:
> > On 12/16/2016 09:48 AM, Pali Rohár wrote:
> > >>> saying that it cause problems which need to be properly fixed.
> > >>> And if fixing them is harder and will take more time, then
> > >>> correct option is to revert 008a2ebcd677 due to breaking
> > >>> support for more devices.
> > >> 
> > >> If you think that others boards may have the same issue, then
> > >> you could add an empty chosen node to omap3.dtsi. As I said I
> > >> think that in practice this will only be needed for the
> > >> machines using NOLO but you are right that in theory you could
> > >> boot them using other bootloaders and having an empty node
> > >> doesn't cause any harm anyway.
> > > 
> > > Should not be it part of any arm board? IIRC ATAG support is (or
> > > was) not omap3 specified.
> > 
> > Yes, but you were talking about commit 008a2ebcd677 which only
> > removed skeleton.dtsi usage for OMAP3 boards. The same can be done
> > for other SoCs in its top level dtsi for the SoC family of course.
> 
> Yeah probaby best to add the empty chosen node to the ones that had
> skeleton.dtsi removed.

Ok. But still I think that it should be added globally to all arm board 
which can be booted by ATAG bootloader.

> And I think the code should print a warning if no chosen node is
> found?

Which code? Decompressor? Yes, it should but I do not know if at that 
time is (serial) console usable...

-- 
Pali Rohár
pali.rohar@...il.com

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