A brave effort to make a flashable linux image for the MX4N-V20 (8G1/1G) board found in the SCISHION V88 Android TV box
Experimental stuff going on here, proceed with caution!
MX4N 8G/1G
- CPU : Rockchip RK3229 quad core ARM Cortex A7 processor @1.5 GHz
- GPU : ARM Mali-400MP
- Memory : 1GB DDR3
- Storage : 8GB NAND flash + SD card slot up to 16GB
- Video Output : HDMI 2.0 up to 4K2K @60 fps, and 3.5mm AV output (composite)
- Audio Output : HDMI, AV, and coaxial S/PDIF
- Connectivity : 100Mbps Ethernet, 802.11 b/g/n WiFi
- USB : 4x USB 2.0 host ports
- Interfaces : HDMI port, RJ45 port, SPDIF port, 4x USB Host, SD Card Slot, AV Out DC jack.
- Power Supply : 5V/2A
- get UART output through SDcard slot
- Build own U-Boot / Kernel / rootfs
- Video Output while booting
- Enable UART routing to USB port(?)
- Enable netbooting
- USB A Male to Male adapter
- Empty microSD adatper
- 3x Breadboard wires
SDslot pinout seen from back of slot
9 1 2 3 4 5 6 7 8
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USB-TTL and SDslot wiring
USB-TTL SDslot
RXD -> 7
TXD -> 2
GND -> GND
Insert the microSD adapter halfway and get the breaboard wires into the back of SDslot See picture and connect them to the USB-TTL adapter
Connect USB-TTL and open terminal emulator of choice
Baudraute : 1.5M (1500000)
Data bits : 8
Stop bits : 1
Insert USB A Male to Male adapter into the OTG usb port (USB-4) and you should see lots of text scrolling in your terminal window (rejoice!) 👍
Follow this guide
or..
One script to handle it all
- Start AndroidTool/RKBatchTool
- Shorten pins 8 & 9 on the nand chip (see image and make sure you do this right!!!)
- Power up using the OTG port
You should now see 'Found One MASKROM Device'
- Click the 'Upgrade Firmware' tab, then 'EraseFlash' (i had to select firmware before erasing)
- If successful, hit the 'Upgrade' button
All good?
Red LED after tampering with the files on SDcard?
sudo fdisk -l
sudo fsck -a /dev/sd[partition]