Here you find my compiled kernels:
https://drive.google.com/drive/folders/15Y5Y3NAOwg_IMmN3k6hdb7pAQj9oTVTl?usp=sharing
You’ll find that link also on startpage of my wiki. The archive-file contains folders boot and root,which contents have to be copied to the partitions bpi-root/bpi-boot of sd-card.
Currently i have no emmc-image,i’m building currently a clean debian on my emmc. Install on emmc is a bit more tricky because of the partition-change and burning preloader to boot-device
Thanks for your help. I have tried to replace boot and root (lib folder) files but received kernel panic on boot. I will try more but wanted to confirm: Files in lib folder should be replaced or merged?
Files I used:
4.4.112-BPI-R2-Kernel-BPI-BOOT-bpi-r2.tgz
4.4.112-BPI-R2-Kernel.tgz
Image: 2017-09-13-debian-9-stretch-mate-desktop-preview-bpi-r2-sd-emmc.img.zip
Thank you,
I think I’ve made it working (I will try tomorrow with real UART to USB converter when I receive my level shifter). Thanks a lot. Do you think Its possible to write everything from SD to EMMC? Or it will work only from SD?
root@bpi-iot-ros-ai:/home/pi# stty -F /dev/ttyS2 -a
speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
werase = ^W; lnext = ^V; discard = ^O; min = 1; time = 0;
-parenb -parodd -cmspar cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff
-iuclc -ixany -imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
echoctl echoke -flusho -extproc
root@bpi-iot-ros-ai:/home/pi# stty -F /dev/ttyS1 -a
speed 115200 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
werase = ^W; lnext = ^V; discard = ^O; min = 1; time = 0;
-parenb -parodd -cmspar cs8 -hupcl -cstopb cread clocal crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon -ixoff
-iuclc -ixany -imaxbel -iutf8
-opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
-isig -icanon -iexten -echo -echoe -echok -echonl -noflsh -xcase -tostop -echoprt
-echoctl -echoke -flusho -extproc
root@bpi-iot-ros-ai:/home/pi#
Thank you,
Basicly an OS on sd will also work on emmc. You can copy image also via dd to emmc,but you have do some extra steps.
Now you have to modify uEnv.txt (config for uboot) on boot-partition and fstab to mount the right root-partition.
You’ll find the most steps in my wiki
http://www.fw-web.de/dokuwiki/doku.php?id=en/bpi-r2/storage
I created my sd/emmc with debootstrap: http://www.fw-web.de/dokuwiki/doku.php?id=en/bpi-r2/debian
I will try to do like this and share my results. Thanks
copy kernel (p1) and modules (p2, if you not want to copy full rootfs from SD card)
mkdir -p /mnt/emmc/boot/bananapi/bpi-r2/linux
cp /boot/bananapi/bpi-r2/linux/uImage /mnt/emmc/boot/bananapi/bpi-r2/linux
mkdir -p /mnt/emmc/root/lib/modules/
cp -r /lib/modules/$(uname -r) /mnt/emmc/root/lib/modules/
uboot auf die richtige Partition konfigurieren
sed 's/mmcblk0/mmcblk1/' /boot/bananapi/bpi-r2/linux/uEnv.txt > /mnt/emmc/boot/bananapi/bpi-r2/linux/uEnv.txtI have manually copied uImage and kernel to eemc on my already preinstalled debian9 and its working fine. Now its booting from emmc using your kernel. Thank a lot Frank, you are the best 
Do you happen to know if I can move rootfs to SATA hdd using your kernel? I read somewhere that it should be custom kernel so sata will be available on boot.
Thank you,
you can only copy rootfs to hdd/ssd (boot-partition must be on emmc/SD)
you just need to change uenv.txt (on sd/emmc) to point to you hdd/ssd-partition (root=/dev/sdax) and change /etc/fstab in your rootfs so that the right / is mounted
but now it’s leaving the topic…please make a new topic if you have more questions
You are right. Thanks for your help and wiki you created (it helped a lot), hope this discussion will be valuable for other people as well.
Thank you,
Uart 0 and 1 are on 40pin-header,uart2 is the debug-uart (maybe can used in another way) and uart3 are only 2 dots on circuitboard near debug-pins
@garywang: i have some 4 solder-pods next to debug-uarts rx-pin…are these connected to the TPxx-pins of uart3?
Thanks for the quick response. Can we use UART 3 on GPIO?. I dont think the 2 dots of near by debug-pins can soldered.
Also like to know if there is any way to disable the debug-UART and can be used for our purpose.
TIA.
imho you can use debug-pins as normal uart, you have to disable the debug-block in dts:
aliases {
serial2 = &uart2;
};
chosen {
stdout-path = "serial2:115200n8";
};
@frank-w Till now I am testing with UART0 & UART1 with ttyS1 & ttyS2. I am using RS485/ModbusRTU on these serial ports. However, I am facing some issues while communicating Modbus slave devices over ttyS1 & ttyS2. I can see that these ports also used by login consoles and hence the RS485 modbus failed to communicate devices correctly over modbus prototcol. Is there anyway I can assign some other ports instead of these ttyS1 & ttyS2 for UART0/1?.
TIA.
have you tried to set the serialmode (e.g. raw)? i had also issues because the mode was not set correctly by default
http://wiki.fw-web.de/doku.php?id=en/bpi-r2/gpio#port_preferences