RockPi-E enabling UART1 and OTG using custom DT overlays

[djjerdog]

I wanted to share 2 custom overlays I've created and tested for the RockPi E to enable UART1 and OTG via the GPIO.

 

Create file rockchip-uart1.dts

/dts-v1/;
/ {
	compatible = "rockchip,rk3328";
	fragment@0 {
		target-path = "/serial@ff120000";
		__overlay__ {
			pinctrl-0 = < 0x23 >;
			status = "okay";
		};
	};
};

 

Create file rockchip-otg.dts

/dts-v1/;
/ {
	compatible = "rockchip,rk3328";
	fragment@0 {
		target-path = "/usb@ff580000";
		__overlay__ {
			dr_mode = "otg";			
		};
	};
};

 

 

Install and enable overlays:
sudo armbian-add-overlay rockchip-uart1.dts
sudo armbian-add-overlay rockchip-otg.dts

[ChrisO]

Excellent! Thank you very much! A second serial port is what I was looking for and now it works.

Couldn't figure out how to use the OTG one, though. Which GPIO pins are involved?

 

Regards,

Chris

[Armandooooo]

Hi,

 

I have followed the procedure above to make it work, however I have an issue still. I am on armbian 21.08.1 Buster with Linux 5.10.60, the latest available. For information I have make this work with the legacy kernel so my wiring is fine.

 

#sudo dd bs=1M if=/dev/zero of=/piusb.bin count=64

#mkfs.ext4 -t ext4 /piusb.bin -O ^has_journal 

#sudo modprobe g_mass_storage file=/piusb.bin stall=0 removable=1 ro=1

#dmesg |tail -20

[   58.531943] Mass Storage Function, version: 2009/09/11
[   58.531983] LUN: removable file: (no medium)
[   58.532430] LUN: removable read only file: /piusb.bin
[   58.532452] Number of LUNs=1
[   58.532861] g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11
[   58.532882] g_mass_storage gadget: userspace failed to provide iSerialNumber
[   58.532896] g_mass_storage gadget: g_mass_storage ready
[   58.532921] dwc2 ff580000.usb: bound driver g_mass_storage
[   58.548704] dwc2 ff580000.usb: dwc2_core_reset: HANG! Soft Reset timeout GRSTCTL_CSFTRST
 

Do you know what can make this dwc2_core_reset: HANG?

 

Thank you,

Armandooooo

[ich777]

Hi, I've also created a overlay for the Realtek 8211f NIC for RockPi E HW version 1.21 that I want to share.

 

Just place the file somewhere on your SBC and issue:

armbian-add-overlay <FILENAME>

(add sudo if needed in front) and reboot afterwards.

 

/dts-v1/;
/ {
	compatible = "rockchip,rk3328";
	fragment@0 {
		target-path = "/ethernet@ff540000";
		__overlay__ {
			snps,reset-delays-us = <0 20000 100000>;
			tx_delay = <0x1a>;
			rx_delay = <0x14>;
		};
	};
	fragment@1 {
		target-path = "/ethernet@ff540000/mdio";
		__overlay__ {
			ethernet-phy@1 {
				compatible = "ethernet-phy-id001c.c916", "ethernet-phy-ieee802.3-c22";
				reset-assert-us = <20000>;
				reset-deassert-us = <100000>;
				max-speed = <1000>;
			};
		};
	};
};

 

[ich777]

@Igor can this overlay (one post above that) be added to the overlays for Rockpi E? I haven't found a way to contact the maintainer krachlatte about that.

With the overlay the RTL8211F will be supported which is currently listed as not supported on the Rockpi E Armbian page here:

 

Everything is working and I've already deployed a few PiKVM instances with that overlay, see here.

[Igor]

4 hours ago, ich777 said:

can this overlay (one post above that) be added to the overlays for Rockpi E?

 

Open a PR here https://github.com/armbian/build/tree/main/patch/kernel/archive/rockchip-6.1/overlay

 

4 hours ago, ich777 said:

I haven't found a way to contact the maintainer krachlatte about that.

 

If he doesn't want to be contacted, there is nothing we can do. This is volunteering position at best effort principle. Some have time, interests and love, some don't. When we notice maintainer becomes unresponsive, board is (at release cycle) moved from "Standard" to "Community support" unless someone else take it over ...

 

https://github.com/ich777/pikvm-rockpi-e

This would be much better to be done as extension to the build framework.
Examples:
https://github.com/armbian/os/blob/main/userpatches/extensions/ha.sh

https://github.com/armbian/os/blob/main/userpatches/extensions/openhab.sh

Docs:
https://docs.armbian.com/Developer-Guide_Extensions/

There is another person, that is around, doing similar https://github.com/srepac/kvmd-armbian perhaps teaming up and do it properly & maintainable? And with IMO less efforts.

[ich777]

vor 20 Stunden schrieb Igor:

Open a PR here

PR created. Thanks for the quick response.

 

BTW, I have two other patches that enable the UART1 on the GPIOs and that enable the USB2.0 on the GPIOs on the Rockpi E, is that something that is from interest or better speaking worth a PR since the UART1 overlay that is already available is not working correctly for me.

 

vor 20 Stunden schrieb Igor:

This would be much better to be done as extension to the build framework.

Thanks for the hint, I have to look into that but I have to say that currently my time is really limited but I already thought about something like that.

Edited March 12 by ich777

[SteeMan]

I'd recommend submitting PRs for what you think is necessary.  You will get better feedback there than here in the forum as more developers follow the GitHub activity than the forums.

[ich777]

@SteeMan thanks, I close the PR for now. Have to schedule this for in a month or two.

Edited March 12 by ich777