Re: dtb size limit? was Re: Tiny dts change breaks boot on n900

Tony Lindgren
2014-11-10T15:10:13Z

* Pavel Machek <pavel@ucw.cz> [141110 04:59]:
> On Mon 2014-11-10 13:31:18, Pavel Machek wrote:
> > Hi!
> >
> > I'm confused:
> >
> > This fixes boot on n900. Strange thing is ... adp1653 driver is not
> > even compiled in -- it is module.
> >
> > It looks like tiny change in dts noone should care about breaks
> > boot... I don't even have adp1653 device parsing code written.
> >
> > Something similar happened before -- change in device tree order broke
> > boot.
> >
> > Any ideas? What is going on?
>
> If I replace the blog below with
>
> a = <1>;
> b = <2>;
> c = <3>;
> d = <4>;
>
> Resulting kernel boots. Replacing it with
>
> a-really-long-attribute-name-hopefully-this-breaks-stuff = <1>;
> b = <2>;
> c = <3>;
> d = <4>;
>
> Breaks the boot. I'm using dtb append option. Any ideas? Nonbooting
> dtb is 68910 bytes.
>
> pavel@amd:/data/l/linux-n900$ ls -al arch/arm/boot/dts/omap3-n900.dtb
> -rw-r--r-- 1 pavel pavel 68910 Nov 10 13:52 arch/arm/boot/dts/omap3-n900.dtb
>
> I removed some "smsc,lan91c94" settings, and it boots again. Weird.

Seems like we may still have some issues with the relocation if
it's size related. Or a regression maybe?

See for example commit 5ffb04f6690d ("ARM: zImage: make sure appended
DTB doesn't get overwritten by kernel .bss")

Regards,

Tony

> > diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
> > index f3118bf..557a19e 100644
> > --- a/arch/arm/boot/dts/omap3-n900.dts
> > +++ b/arch/arm/boot/dts/omap3-n900.dts
> > @@ -565,11 +565,6 @@
> > adp1653: adp1653@30 {
> > compatible = "ad,adp1653";
> > reg = <0x30>;
> > -
> > - max-flash-timeout-usec = <500000>;
> > - max-flash-intensity-mA = <0>;
> > - max-torch-intensity-mA = <0>;
> > - max-indicator-intensity-uA = <0>;
> > };
> > };
> >
> >
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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