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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Date:   Fri, 16 Dec 2016 16:27:22 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Tony Lindgren <tony@...mide.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        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 Fri, Dec 16, 2016 at 05:13:46PM +0100, Pali Rohár wrote:
> 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.

+1

> > 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...

It isn't in multiplatform situations.  Best if the kernel prints it,
because then it can be logged.

-- 
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