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root@orangepiwin:/home# ls
u-boot-sunxi-with-spl.bin  
root@orangepiwin:/home# dd if=/dev/zero of=/dev/mmcblk2 bs=1M count=1
1+0 records in
1+0 records out
1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.20159 s, 5.2 MB/s
root@orangepiwin:/home# dd if=u-boot-sunxi-with-spl.bin of=/dev/mmcblk2 bs=1024 seek=8


^C^C

=> mmc info
Device: mmc@1c11000
Manufacturer ID: 45
OEM: 100
Name: DF401
Bus Speed: 52000000
Mode: MMC High Speed (52MHz)
Rd Block Len: 512
MMC version 5.1
High Capacity: Yes
Capacity: 14.7 GiB
Bus Width: 8-bit
Erase Group Size: 512 KiB
HC WP Group Size: 8 MiB
User Capacity: 14.7 GiB WRREL
Boot Capacity: 4 MiB ENH
RPMB Capacity: 4 MiB ENH

&mmc2 {
        pinctrl-names = "default";
        pinctrl-0 = <&mmc2_pins>;
        vmmc-supply = <&reg_dcdc1>;
        vqmmc-supply = <&reg_vcc1v8>;
        bus-width = <8>;
        non-removable;
        cap-mmc-hw-reset;
        mmc-hs200-1_8v;
        status = "okay";
};