[U-Boot] [PATCH 3/4] sunxi: Add default partition scheme

[Maxime Ripard]

On Mon, Nov 20, 2017 at 12:37:51PM +0100, Emmanuel Vadot wrote:
> On Mon, 20 Nov 2017 10:24:08 +0100
> Maxime Ripard <maxime.ripard at free-electrons.com> wrote:
> 
> > Hi,
> > 
> > On Fri, Nov 17, 2017 at 03:20:03PM +0100, Alexander Graf wrote:
> > > 
> > > 
> > > On 17.11.17 14:04, Maxime Ripard wrote:
> > > > On Fri, Nov 17, 2017 at 12:21:49PM +0000, Andre Przywara wrote:
> > > >> Hi,
> > > >>
> > > >> On 17/11/17 08:27, Maxime Ripard wrote:
> > > >>>
> > > >>> I guess I also have a side question here. How do the installers deal
> > > >>> with the ESP partition? Would they create a new filesystem on it no
> > > >>> matter what, or are they a bit smarter than that?
> > > >>
> > > >> I would expect any installer to not mess with the ESP. After all the ESP
> > > >> belongs to the firmware, and multiboot (both multiple Linux versions as
> > > >> well as other OSes like Windows or BSD) is one main feature of the ESP.
> > > >>
> > > >> The only exception might be if the ESP is not formatted.
> > > >>
> > > >>> My actual question being what will happen if one stores the U-Boot
> > > >>> environment on that partition, and then runs an installer? Would the
> > > >>> environment be gone?
> > > >>
> > > >> I would say that the ESP is a perfect place for the environment. It's
> > > >> FAT and it belongs to firmware, so OSes are just expected to *add* their
> > > >> bootloaders, without touching any other file on it.
> > > > 
> > > > Ok, perfect then, thanks!
> > > 
> > > Please make sure to
> > > 
> > >   a) Format it as FAT and
> > 
> > That might be the toughest part :)
> > 
> > AFAIK, u-boot is not able to format any filesystem. We could just
> > flash a raw FAT filesystem though, but looking into it might help for
> > the environment discussion.
> 
>  Also note that if we go to 16MB for the size you need to tweek
> clusters and other properties for FAT32 as using the default ones will
> not work (the minimal size is ~35MB iirc).

I guess the conclusion has been that we would stay with 128MB, so I
guess it's not a problem :)

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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