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.
