[PATCH v1 2/3] colibri-imx7: specify MTD partitions on command line

Francesco Dolcini francesco at dolcini.it
Mon Jan 16 14:58:28 CET 2023

On Sun, Jan 15, 2023 at 03:33:25PM +0100, Marek Vasut wrote:
> On 1/13/23 19:45, Francesco Dolcini wrote:
> > From: Francesco Dolcini <francesco.dolcini at toradex.com>
> > 
> > Disable fdt_fixup_mtdparts(), instead pass MTD partition on the command
> > line. This is the preferred method to be used when partitions are not
> > statically defined into the DTS according the Linux MTD subsystem
> > maintainer.
> Do we really want to do this ?
> I thought passing the mtdparts via DT is the preferred way ?

Yes, to me it seems like the most robust approach to minimize chances
of regressions and boot issues.

With the current dts schema, that expects the partitions to not be
direct children of the nand controller node, but expecting having a
nand-chip, and partitions as a child of the nand-chip this is the most
likely approach to just works.

For example if I add a partition node to my DTS, older U-Boot will just
ignore it and add the partitions as children of the nand controller.
In this case the current parser will just fails leading to another
flavor of boot failure on our board.

In reality I cannot really tell which u-boot/kernel combination is going
to be used on our SOMs.

Said that, what would be the disadvantages of having the partitions on
the command line? Miquel?


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