K36¶

Overview¶

Hardware¶

SoC	CPU	GPU
Rockchip RK3326	ARM Cortex-A35 (Quad-core) @ 1.3 GHz	Mali G31

Display	RAM	eMMC	Connectivity
4.0-inch 720*720	1 GB DDR3	8 GB	None

Software¶

Kernel	GPU drivers	Compositor	Interface
Mainline Linux	libmali (GLES 3.2) & Panfrost (GL 3.1/GLES 3.1)	Sway	Emulation Station

Controls¶

RetroArch Hotkeys¶

Button Combo	Action
`SELECT`+`START` ^(x2)	Quit Game
`SELECT`+`R1`	Save State
`SELECT`+`L1`	Load State
`SELECT`+`Y(NORTH)`	Open RA Menu
`SELECT`+`A(SOUTH)`	Reset Game
`SELECT`+`X(WEST)`	Show FPS
`SELECT`+`B(EAST)`	Take Screenshot
`SELECT`+`R2`	Fast-Forward

Notes:¶

By default ROCKNIX will detect your controller and configure RetroArch hotkeys automatically. This is controlled by the "AUTOCONFIGURE RETROARCH HOTKEYS" option in the Settings > Controller & Bluetooth menu. While the option is enabled, RetroArch hotkeys will be overwritten by the above defaults each time RetroArch is launched. If this behavior is not desired that option can be disabled and your user-defined RetroArch hotkeys will be used instead.

Mednafen Hotkeys¶

Button Combo	Action
`SELECT`+`START` ^{(hold for 2sec)}	Quit Game
`SELECT`+`R1`	Save State
`SELECT`+`L1` ^{(hold for 2sec)}	Load State
`SELECT`+`X(WEST)`	Show FPS
`SELECT`+`R2`	Fast-Forward
`START`+`L1`	Select disc
`START`+`R1`	Eject/Insert disc
`START`+`D-Pad Left`	Decrease save slot by 1
`START`+`D-Pad Right`	Increase save slot by 1
`START`+`L2`	Configure buttons on virtual port 1
`START`+`R2`	Insert coin

Notes:¶

By default ROCKNIX will expand the configuration file according to the first controller mednafen finds. This only happens when the config file doesn't exist (meaning the first time or if you manually delete it). After the initial expansion you are free to customize the controls.

Global Hotkeys¶

Button Combo	Action
`L1`+`START`+`SELECT`	Exit Emulator / Application
`SELECT`+`Vol +`	Brightness Up
`SELECT`+`Vol -`	Brightness Down
`START`+`Vol +`	Battery Status
`START`+`Vol -`	WIFI Toggle

Emulators¶

Platform Documentation (RK3326)

Notes¶

Installation¶

Download the latest RK3326-B version of ROCKNIX from the button below and follow the instructions listed on the Install page.

Other variants with same PCB (K36, R36Pro, R36s clones of year 2025)¶

Vendor DTBs are very similar, PCBs look very similar too.
Chances are only display overlay is needed. Try the following instructions and tell us if that worked for you!

If you have an original .dtb file, you can generate a mipi-panel.dtbo from it.
Assuming you have an SSH access and you have scp'd the original dtb as rf3536k4ka.dtb, the process would be as follows:

RK3326:~ # mount -o remount,rw /flash
RK3326:~ # mkdir -p /flash/overlays/
RK3326:~ # ### Be not afraid! importpanel.py may run for a minute or two for some panels
RK3326:~ # /usr/libexec/generic-dsi/importpanel.py rf3536k4ka.dtb -O /flash/overlays/mipi-panel.dtbo
RK3326:~ # sync; mount -o remount,ro /flash/

Here we just make an overlays directory writable, then call a script that does all the importing stuff.
Feel free to run this script on your PC, modify it and experiment with panel timings.

This script adds a bunch of potentially useful refresh rates, but we have very few knowledge on which modes work well.
Please check them with wlr-randr or with game configuration and tell us which modes work with your panel.