Add flash NOR chip for rootfs_data?

For Developers
1

I develop my own router board based on HLK-7621 module ( MT-7621 chip, ralink ). This module is equipped 32MB NOR flash chip.

I need to get more space to install optional packages ( marked as "M" in menuconfig ) from my own repository.

To do this I want to do the following:

  • Add new NOR flash chip ( SPI bus, CS1 pin available )
  • Move rootfs_data partition to this chip
  • Expand rootfs partition on flash@0 chip using available free space

In DTS file add section in spi0 part ( after flash0 ):


        flash@1 {
                #address-cells = <1>;
                #size-cells = <1>;

                compatible = "jedec,spi-nor";
                reg = <1>;
                spi-max-frequency = <44000000>;
                broken-flash-reset;

                partitions {
                        compatible = "fixed-partitions";

                        partition@0 {
                                label = "rootfs_data";
                                reg = <0x0 0x2000000>;
                        };
                 };
	};

Is this possible? What to do with the "firmware" partition ?