Finlay after spending some time i got natively OpenWrt with 4.14.20 Kernel running on my R2.
I will try to sum up all thinks here to get a little walk thru:
What you need:
- USB-to-UART adapter -> connected to “Debug UART” on board and on other side to your computer
- a running TFTP-Server
- a µSD card + reader
- of course cabling for networking, power supply etc.
Get the “mtk-bpi-r2-SD.img” Image from FrankW’s google drive:
Put it on a µSD card
sudo dd if=mtk-bpi-r2-SD.img of=/dev/mmcblk0
Pleas note! I use here my build-in card reader on my notebook. So i got the µSD card mapped to mmcblk0. If you have a external card reader they maybe appear as /der/sdx! Check Kernel ring buffer for right device name before you overwrite your own sys-partiton !
Don’t panic! This image contains not partitions so many tools will you show an empty µSD card. This is not true! If you realy want to look if the image file is writen to µSD then try tools like diff, hexdump or binwalk
You can do it same way on the .img file to get the same output…
Wire up the R2 with the USB to UART adapter. I use the buspirate with minicom but there are so many other solutions out there that may also work.
Put the µSD into the R2 and press power button for about 6-8 seconds to boot up your board. You will see lines like this…
…and at this point press any key! So you will get into U-Boot
Now checkout the OpenWrt source code from github on your local computer
git clone https://github.com/openwrt/openwrt.git
Step into the openwrt folder and execute following commands to update and install feeds first:
cd openwrt ./scripts/feed update -a ./scripts/feed install -a
Get config for the R2 target
- Target system -> MediaTek Ralink ARM
- Target images -> ramdisk
Let other thinks as there are for first time. Then exit and save all changes to .config file
Build the images:
After successful build step into
Here you will find following files:
copy both files to your tftp-server. Check Permissions on files and that your tftp-server is running now and serving these files.
Connect your R2 borad (WAN Port) with the tftp server via Ethernet cable.
Now you need to configure the R2-WAN-Network device in U-Boot
setenv ipaddr <set your temporary ip address for B2 board> setenv netmask 255.255.255.0 setenv serverip <set the ip adress of the tftp server>
check if thetftp-server is reachable by the R2
ping <ip address of the tftp server>
if you get a message ‘is alive’ then you can proceed with next step other wise you must check your cabling, tftp server and network configuration.
Getting the kernel with init into emmc:
tftp 84000000 uImage-mt7623a-rfb-emmc-initramfs mmc dev 0 mmc write 84000000 1000 6000
Now get the rootfs into emmc:
tftp 84000000 root.squashfs mmc dev 0 mmc write 84000000 20A00 6000
Remove your µSD card from board
Reboot your board via ‘reset’ command and you are done!
- After first boot all my network devices are populated and accessable via ping except the wifi. After second boot i get only eth0 and eth1 but not functional. I can bring the device up but link did not appear. I find out that if i enter the U-Boot again and bring up the WAN device via ping command and then boot to OS all devices again ready until reboot without U-Boot step. Maybe an initialization problem
Currently i did not have time to look deeper into this and check other thinks like wifi. Will do so maybe in next days…
If you have questions so feel free to ask