[PATCH] mtdpart: Support MTDPART_SIZ_FULL in fixed-partitions

[Michael Nazzareno Trimarchi]

Hi MIke

On Mon, Apr 7, 2025 at 3:42 PM Mike Looijmans <mike.looijmans at topic.nl>
wrote:

> ping?
>
> Maybe I should have added to the description that the Linux kernel
> allows MTD partitions to specify a size "0" in the device-tree to mean
> "the remainder". This patch makes u-boot compatible with the kernel's
> MTD partitions. U-boot MTDPARTS also supported this, but it's missing in
> the device-tree parser.
>
>
Please expand your commit message . Add an example where is defined this
way in linux kernel and add your example. I found out that is used a lot in
omap3 platform
but please point me to some recent board if you know

Michael

M.
>
> On 25-03-2025 16:52, Mike Looijmans wrote:
> > Flash partitions may specify MTDPART_SIZ_FULL (=0) as the size of the
> > partition to indicate "the remainder of the flash". Make this work with
> > device-tree "fixed-partitions" as well.
> >
> > Signed-off-by: Mike Looijmans <mike.looijmans at topic.nl>
> > ---
> >
> >   drivers/mtd/mtdpart.c | 6 ++++--
> >   1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
> > index 88094b81e7a..5284890bd88 100644
> > --- a/drivers/mtd/mtdpart.c
> > +++ b/drivers/mtd/mtdpart.c
> > @@ -910,11 +910,13 @@ int add_mtd_partitions_of(struct mtd_info *master)
> >                       continue;
> >
> >               offset = ofnode_get_addr_size_index_notrans(child, 0,
> &size);
> > -             if (offset == FDT_ADDR_T_NONE || !size) {
> > -                     debug("Missing partition offset/size on \"%s\"
> partition\n",
> > +             if (offset == FDT_ADDR_T_NONE) {
> > +                     debug("Missing partition offset on \"%s\"
> partition\n",
> >                             master->name);
> >                       continue;
> >               }
> > +             if (size == MTDPART_SIZ_FULL)
> > +                     size = master->size - offset;
> >
> >               part.name = ofnode_read_string(child, "label");
> >               if (!part.name)
>
>
> --
> Mike Looijmans
> System Expert
>
> TOPIC Embedded Products B.V.
> Materiaalweg 4, 5681 RJ Best
> The Netherlands
>
> T: +31 (0) 499 33 69 69
> E: mike.looijmans at topic.nl
> W: www.topic.nl
>
>
>
>

-- 
Michael Nazzareno Trimarchi
Co-Founder & Chief Executive Officer
M. +39 347 913 2170
michael at amarulasolutions.com
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