7531AE driver where find it in build i cant find it
Post a photo of the PCB, and we'll tell you.
Right edge, by the capacitor.
i see it i need to build bootloader or not?
whats best soultion?
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is there Reference Board to work with mine
No guarantee it'll actually work.
ok what files need to spi nand 256mb
i will repartition spi nand 256mb
how backup
partition
Boot the initramfs (KERNEL image) and dump the flash.
how do it?
when router arrive i will talk to you i want make support for openwrt for this device
Based on your question, and assuming no already existing image works, you have a pretty steep learning curve ahead of you.
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Openwrt it's open to learning i think i will do my best 
how to boot initramfs ?
Hook up serial, interrupt the boot loader, and run tftpboot.
can you send command to transfer and to boot
In order for U-Boot to load the OS from an SD card it needs to be built with support for MMC storage -- you can check if the vendor loader includes that by trying the mmc command. If so, you can modify the bootcmd variable to load the kernel uImage from the SD card. If not you will have to replace U-Boot (which also isn't that hard, thanks to mtk_uartboot you can easily do this by try and error).
Alternatively, you can try to modify the board so the SoC would load the bootloader from the SD card instead of from the SPI NAND flash (ie. 11 : SNAND(SNFI) -> SD instead of 01 : SPI-NAND -> SD), see
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