[PATCH 2/2] arm: mvebu: Espressobin: Setup MTD partitions when booting kernel

[Pali Rohár]

On Thursday 20 August 2020 07:02:18 Stefan Roese wrote:
> Can't you just use "mtdparts=" kernel cmdline parameter instead to pass
> the MTD layout to the kernel?

Maybe it is possible too, I have not tried it.

I thought that more common is to update DTS file by uboot when loading
kernel as it is already done e.g. for ethernet MAC address on
Espressobin.

Also I see that uboot has function fdt_fixup_mtdparts() via
CONFIG_FDT_FIXUP_PARTITIONS option which do this, but uses uboot MTD
code which IIRC cannot initialize SPI NOR.

Anyway, updating DTS has advantage that it is not needed to update
existing boot scripts for OS. There are more distributions for
Espressobin which have own boot scripts stored on SD card for loading
kernel. And therefore to use command line parameters it would be needed
to update all of them.

And I see there another problem. For specifying size of mtd partitions
in command line, it is required to know offsets of those partitions. And
e.g. uboot env partition depends on CONFIG_ENV_OFFSET option which is
not available for uboot boot script code.

But if you have other idea, I'm open to also other solutions.