[PATCH] doc: bootstd: Describe the optional extension_overlay_addr environment

[Kory Maincent]

On Tue, 4 Nov 2025 16:15:32 +0100
Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:

> On 11/4/25 11:45, Kory Maincent wrote:
> > From: "Kory Maincent (TI.com)" <kory.maincent at bootlin.com>
> > 
> > Add extension_overlay_addr description to the list of environment
> > variables that can be useful during the standard boot.
> > 
> > Signed-off-by: Kory Maincent (TI.com) <kory.maincent at bootlin.com>
> > ---
> >   doc/develop/bootstd/overview.rst | 3 +++
> >   1 file changed, 3 insertions(+)
> > 
> > diff --git a/doc/develop/bootstd/overview.rst
> > b/doc/develop/bootstd/overview.rst index 6cf3b48efca..d3dba2a3405 100644
> > --- a/doc/develop/bootstd/overview.rst
> > +++ b/doc/develop/bootstd/overview.rst
> > @@ -261,6 +261,9 @@ fdt_addr_r
> >   fdtoverlay_addr_r (needed if overlays are used)
> >       Address at which to load the overlay for the FDT, e.g. 0x02000000
> >   
> > +extension_overlay_addr (needed if extension is used)
> > +    Address at which to load the extension FDT overlays, e.g. 0x02000000  
> 
> Requiring a predefined address instead of allocating memory via LMB is 
> not a good design.

Didn't know this U-boot framework and there is no such uses in standard boot
code. It would have been nice to review the series before it got merged I
would have been glad to move it to a better design.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com