How do I compile openwrt to flash MT7603_EPAELNA_2T2R_V12.bin to eeprom_factory_0

For Developers
1

I have a board using a MT7621 CPU with an external MT7603E WIFI chip.

The dts partition has an eeprom_factory_0 and eeprom_factory_8000, is it used to store the MT7603E calibration data?

I got MT7603_EPAELNA_2T2R_V12.bin file from the vendor, how do I compile openwrt to flash MT7603_EPAELNA_2T2R_V12.bin to eeprom_factory_0?

The dts content:

&spi0 {
        status = "okay";

        m25p80@0 {
                compatible = "jedec,spi-nor";
                reg = <0>;
                spi-max-frequency = <24000000>;

                partitions {
                        compatible = "fixed-partitions";
                        #address-cells = <1>;
                        #size-cells = <1>;
                        broken-flash-reset;

                        partition@0 {
                                label = "u-boot";
                                reg = <0x0 0x30000>;
                                read-only;
                        };

                        partition@30000 {
                                label = "u-boot-env";
                                reg = <0x30000 0x10000>;
                        };

                        factory: partition@40000 {
                                label = "factory";
                                reg = <0x40000 0x10000>;

                                compatible = "nvmem-cells";
                                #address-cells = <1>;
                                #size-cells = <1>;

                                eeprom_factory_0: eeprom@0 {
                                        reg = <0x0 0x4da8>;
                                };

                                eeprom_factory_8000: eeprom@8000 {
                                        reg = <0x8000 0x4da8>;
                                };

                                macaddr_factory_e000: macaddr@e000 {
                                        reg = <0xe000 0x6>;
                                };

                                macaddr_factory_e006: macaddr@e006 {
                                        reg = <0xe006 0x6>;
                                };
                        };

                        partition@50000 {
                                compatible = "denx,uimage";
                                label = "firmware";
                                reg = <0x50000 0>;
                        };
                };
        };
};

&pcie {
        status = "okay";
};

&pcie0 {
        wifi@0,0 {
                compatible = "mediatek,mt76";
                reg = <0x0000 0 0 0 0>;
                nvmem-cells = <&eeprom_factory_0>;
                nvmem-cell-names = "eeprom";
                ieee80211-freq-limit = <2400000 2500000>;
        };
};

&pcie1 {
        wifi@0,0 {
                compatible = "mediatek,mt76";
                reg = <0x0000 0 0 0 0>;
                nvmem-cells = <&eeprom_factory_8000>;
                nvmem-cell-names = "eeprom";
                ieee80211-freq-limit = <5000000 6000000>;
        };
};
2

Uhm, you just flash it!?
eeprom_factory_0 starts at 0x0 in your factory partition. The first 0x4da8 bytes you write to 0x0 in you factory partition end up in eeprom_factory_0

3

Also if you do it from OpenWrt itself, load mtd_rw module or modify the device tree to have that partition not marked as read-only.

4

Flush it in directly with the dd command line?

Like dd if=./eeprom.bin of=/dev/mtd2 bs=1

Is it possible to compile eeprom.bin directly into openwrt?

5

It is not possible to write to mtd devices with dd as these are not block devices. Use mtd utility instead.

6

While you're right, it's not marked as "read-only" in the DT posted above.

You could have just done a web search. Among the first results is this patch:
https://patchwork.kernel.org/project/linux-wireless/patch/YSWdoKIaVCqAU6nG@makrotopia.org/

So you can embed the EEPROM directly in the FDT (dts). You cannot load from file. See the source file for reference:

1 Like
7

Hi @andyboeh , What should I do if I want to embed the EEPROM directly into the FDT (dts)? Is there a reference for this?

I search whole openwrt, not found eeprom-data reference.

8

Reading through the links posted and/or the documentation would be a good start:

https://www.kernel.org/doc/Documentation/devicetree/bindings/net/wireless/mediatek%2Cmt76.yaml

Then you haven't searched hard enough - this is one of the results:

2 Likes
9

Thank you @andyboeh

11

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