Rock Pi S OTG in Host Mode

#1

Hello friends,

I want to connect a USB flash drive via OTG port on Rock Pi S. I have used a type C OTG connector as shown in picture

image

But after connecing it and using “lsusb” command it does not show any device connected.

Any idea what I’m doing wrong??

#2

Hi, to configure ROCK Pi S Type-C port to work in host mode, you can check these two guides.

https://wiki.radxa.com/RockpiS/Ubuntu#USB or https://wiki.radxa.com/RockpiS/Debian#USB.

#3

Hi Stephen,

That solution did not worked.

First of all, there is no overlay file named “rk3308-usb20-host” in my /boot/dtbs/4.4.143-48-rockchip-geacd15ae244f/rockchip/overlay folder

This I can understand because my Kernel version is 4.4.143-48 but the guide you mentioned recommends version >=4.4.143-51.

So I followed the commands mentioned at https://wiki.radxa.com/RockpiS/Debian#Update_necessary_packages
but again it failed the kernel update command “sudo apt-get install -y linux-4.4-rockpis-latest” mid-process with the error that the required file was not found in the repository (shown in below image)

image
image.png1339×190 16.5 KB

not to mention that even the above command was trying to install kernel version 4.4.143-49 and not the recommended 4.4.143-51.

I am using the latest Debian Buster image from Radxa (image dated: 28/05/2020)

#4

Try

sudo su
apt-get update
apt-get install linux-4.4-rockpis-latest

And the following information should be shown.

root@rockpis:/home/rock# apt-get install linux-4.4-rockpis-latest
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  linux-firmware-image-4.4.143-51-rockchip-gb2a02deb3cbd linux-headers-4.4.143-51-rockchip-gb2a02deb3cbd
  linux-image-4.4.143-51-rockchip-gb2a02deb3cbd
The following NEW packages will be installed:
  linux-firmware-image-4.4.143-51-rockchip-gb2a02deb3cbd linux-headers-4.4.143-51-rockchip-gb2a02deb3cbd
  linux-image-4.4.143-51-rockchip-gb2a02deb3cbd
The following packages will be upgraded:
  linux-4.4-rockpis-latest
1 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 17.9 MB of archives.
After this operation, 107 MB of additional disk space will be used.
Do you want to continue? [Y/n]
#5

Just a question - does using USB OTG in Host mode on Pi S works on the latest images with kernel 6.1? I don’t see any specific overlay in the images here https://github.com/radxa-build/rock-pi-s/releases

#6

This overlay works if someone needs:

/dts-v1/;
/plugin/;

/ {
	compatible = "rockchip,rk3308";

	fragment@0 {
		target = <&usb20_otg>;

		__overlay__ {
			dr_mode = "host";
			status = "okay";
		};
	};
};
#7

Thank you for this, @kolsi. I’m looking to try this on Armbian, do you have a link to the full process of adding this overlay? I assume once created it could be referenced in armbianEnv.txt ?

Also, dr_mode is currently set to “peripheral” in the RK3308 overlay. If it were set to otg instead of host would the port then be auto-detecting?

#8

Ok, so I think these pages might have the answer, haven’t tried it yet.
https://docs.armbian.com/User-Guide_Armbian_overlays/
and

It looks like, I would create a file called something like rk3308-usb-otg.dts in the /boot/overlay-user folder, with the contents you wrote above.
execute armbian-add-overlay rk3308-usb-otg.dts
reboot

That should be it?

USB Sound Card on Type-C Connector
#9

Doesn’t seem to work. :frowning:
I’m also feeling like Armbian isn’t loading ANY overlays. I wonder if anyone can confirm?