CoreELEC Team SDIO Debug Board

CoreELEC Team SDIO Debug Board

v1.0 20200310
2020-03-11 07_42_58-sdio_3D_1

2020-03-11 07_42_58-sdio_3D_2

SDIO Debug Boards current stock: 0

Back in stock (approximately): unknown
Current price (including postage and packing by standard mail): €15.00

Researched and developed by Team CoreELEC by @anon88919003, @Portisch and @vpeter, we proudly present the universal Amlogic SDIO debug board, the SDIO debug board will give you easy access to the UART interface without needing to open your device and/or without having to modify anything.

Purpose of the SDIO debug board

With dmesg you are limited to retrieving debug logs from the Linux kernel only, if you need logs from bootloader (u-boot) for example if you have a bricked device or a wake up issue from power off/suspend then this adaptor can be easily used to identify issues.

How to use

  • Power of your device and insert the SDIO debug board like a standard micro SD card into the devices memory card slot.

  • If you want to boot from a micro SD card then first insert your currently used micro SD into the SDIO debug board memory card slot and then the SDIO debug board into your devices memory card slot. NOTE: Please keep in mind that the micro SD memory card will use only 1 bit bus mode so reading and writing from the storage will be 4x slower than normal. Currently there looks to be a “bug” located in the kernel and booting devices with the G12A SoC (S905X2) are unable to boot CoreELEC from micro SD when using this SDIO debug board. If this is the case on your device then please boot from eMMC and/or a USB memory device.

  • The 4 pin header is a TTL UART interface, you can use any standard TTL/USB UART adaptor to connect the adaptor to your host computer. The UART connection used is 8N1, 115200bps: 8 bit, parity none, 1 stop bit, baud rate 115200bps.

  • There is a solder jumper (J1) located next to the VDD pin of the pin header, this solder jumper is not set by default. If you need +3V3 on VDD pin please inform me whilst ordering or short J1 yourself by a solder blob afterwards, in 99% of the use cases VDD isn’t needed.

Recommended UART/TTL converter:

(type of UART converter with compatibility Top-down)

  1. CP2102
  2. PL2303
  3. FT232

Connection example:

Amlogic devices confirmed working with UART interface by SDIO debug board:

  • H96Pro+ (noname, S912)
  • Minix NEO T5 (S905X2)
  • Minix U22-XJ (S922XJ)
  • VIM1 (S905X)
  • VIM2 (S912)
  • VIM3 (A311D)
  • VIM3L (S905D3)
  • Odroid N2 (S922X)
  • Odroid C4 (S905X3)
  • Beelink GS-King (S922XH)
  • Beelink GT-King (S922X)
  • Beelink GT-King Pro (S922XH)
  • Beelink GT1 (S912)
  • Beelink GT1mini2 (S905X3)
  • M8S (S812)
  • Mini M8S II (S905X)
  • MXIII (S802)
  • UGOOS AM6 (S922X)
  • X3 CUBE (S905X3)
  • X96 (S905X)
  • X96 Max (S905X2)
  • XL Home Entertainment Box DV8252 (AX512) (S905X)
  • Flix TV Box DV8219 (S905X)
  • ZTE B860H V1.1 / V2.1 (S905X)
  • ZTE B866 (S905X)
  • Fiberhome HG680P (S905X)

Amlogic devices confirmed NOT working SDIO debug board:

  • WeTek Play (AML8726-MX)
  • Android M8 TV Box (S802)
  • GM X92 (S912)

UART terminal Putty

The Amlogic SDIO UART do have issues with fast character transfer. So a delay after each single character sent will be needed. Here is a modified version of Putty 0.74 for Windows which include a delay of 1 millisecond after each single character sent.

How to order:

The SDIO debug board will be sold from and by a private person and not the CoreELEC Team (limited warranty), the board will be delivered fully assembled and tested before hand.

If your device isn’t listed above then there is no guarantee that the SDIO debug board will work as expected. If you have tested the SDIO debug board and your device is not listed above please just post a reply to this thread by [brand/vendor][device type] so we can add it to the list, thank you!

If you want to order an CoreELEC Team SDIO debug board then please contact → @Portisch ← by this link for payment and shipment information!


You can use any terminal software in any operation system to watch the serial log.
In Windows 10 I use Terminal:

putty is another option:

Update (20200316):

There are currently no SDIO debug boards on stock. The PCBs (60pcs) are ordered and will arrive approximately in WW14. I will wait until a pre-order of 20 pieces of the SDIO debug board is reached before ordering the mounted parts too to be ready for assembling. So please be patient as it’s the first run and it will take some time until you will receive your ordered SDIO debug board!

1 Like

Perfect if you add the jtag feature. fuĺl firmware dump and rewrite

We intentionally did not add JTAG as this is highest developer level. Hopefully nobody try to dump and write the SoC firmware :crazy_face:

Update 20200315
The PCBs are on the way! I guess they will need 2-4 weeks to arrive.

1 Like

First parts for assembly are arriving…

Have you tried I-tead they have a complete assembly service that was reasonable last time i looked.

Thank you for the tip. For the first pcs I will solder it by reflow by myself as I have all the equipment.
Maybe when the stock needs to be increased I will take a look as it would need a bigger number of assembled boards ordered to get a good price.

Update 31.03.2020:
Last parts for assembling are arrived.
The PCBs are still on the way but I guess they will arrive shortly:
2020-03-29 16:10:00 Flight landed at Destination country

Looks like a he PCBs are arrived today at destination country. So hopefully they will arrive local shortly…

The PCBs are arrived yesterday. All assembled and tested! The first batch is ready for shipping!

Just out of interest, how many orders did you receive ?

Do you have the gerbers/BOM posted for this? I probably have all the parts on hand, so might be cheaper to just print it off at oshpark.

The price also covers the hard work we put into this device. So let’s ignore this and make it for a few € :frowning:

Is it theoretically possible to get a jtag from the sd card slot?

Not just theoretically but also in practice :slight_smile: But not with this adapter because we didn’t have interest in this area - just uart needed for us.

1 Like

How can i order this Debug Board? I can’t pm @Portisch , please advice, Thank you

There is a link in the description which will fill out all needed data for the order.

Click me

still can’t send message sir


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