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  1. mt7621: MIPS 1004k dual core, and two vpe for each core (880Mhz x 2) mt7622: ARM CA53 dual core (1.35Gx2) mt7623: ARM CA7 qual core (1.3Gx4)
  2. Hi all, I tried to share my experience about how to burn preloader/uboot/OpenWRT image, and then boot from eMMC on BPI-R2... 1.Download flash tool from windows: linux: 2. Install MT65xx drivers for your windows PC. You need to install drivers in order to connect your device properly 3. Hardware setup before starting up hacking the board 1) use 12v power adaptor 2) use micro usb to supply extra power when developing on the board that would help reload the images through flash tool (will be introduced in section 4 as the following) just by power off/on to the board manually after images are all selected done. 3) use console to retrieve the log for debugging purpose 4) that is wan port 5) that is lan3 port, so the intermediate ports are listed as lan0, lan1, lan2, and lan3 reviewing from wan port 4.Flash tool configuration 1) download agent: MTK_AllInOne_DA.bin 2) BPI-R2_OpenWRT_scatter.txt ( ) 3) Images - Preloader: preloader_iotg7623Np1_emmc.bin ( ) - GPT (named MBR here): MBR ( ) - Uboot: mt7623_lzma.uboot ( ) - BOOTIMG: lede-mediatek-32-uImage-mt7623n-bananapi-bpi-r2-initramfs ( ) 4) press download button on Flash tool 5) power off BPI-R2 6) power on BPI-R2, and then flash tool will update image automatically. 5 system hang here after upgrading images. 6 try to power off BPI-R2, and on. finally, you can boot from eMMC and see uboot menu. please choose 1 to download OpenWRT FW via TFTP server (e.g., Tftpd64)
  3. comparison table can be found in the link.