Re: [PATCH v4 2/8] OF: Introduce DT overlay support.

[Geert Uytterhoeven]

Hi Pantelis,

On Thu, May 15, 2014 at 9:12 AM, Pantelis Antoniou
<pantelis.antoniou@xxxxxxxxxxxx> wrote:
>> We also need to think about kexec. Kexec works by sucking the live tree
>> out of the kernel and creating a .dtb from it to pass to the new kernel.
>> What will the rules be when kexecing? Do all the overlays need to be
>> removed, or does the kernel get the tree with all the overlays applied
>> (in which case none of the overlays can be removed on the other side of
>> kexec).
>
> We can add a sysfs attribute that configures whether overlays are reverted before
> kexec or not. I can't really tell which is the correct option, so let's allow the
> policy up to user-space.

Kexec'ing into a new kernel doesn't change the hardware, so IMHO the
in-kernel DT should not change.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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
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