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J101 Enable SD Card

J101 Enable SD Card

The method is flashing NVIDIA JetPack OS to the SD card on J101 Carrier Board which is operated on the reComputer J1010. So Flash JetPack OS into reComputer J1010 first is required.

Driver Configuration

At the beginning, we need to power on the reComputer and go to the desktop like below:

Step 1 . Clone the repo

Right click and open the Terminal, and then execute the command below to download the relevant code:

git clone

Step 2. Compile jetson-sdmmc-overlay

Access to the workspace location:

cd seeed-linux-dtoverlays

For J101 Carrier board , We need to change the "compatible" value in this file "overlays\jetsonnano\jetson-sdmmc-overlay.dts".

sed -i '17s#JETSON_COMPATIBLE#\"nvidia,p3449-0000-b00+p3448-0002-b00\"\, \"nvidia\,jetson-nano\"\, \"nvidia\,tegra210\"#' overlays/jetsonnano/jetson-sdmmc-overlay.dts

And then we compile the file we changed to make sure they are correctly modified.

make overlays/jetsonnano/jetson-sdmmc-overlay.dtbo

Step 3. Make sure the sd card can be recognized

Insert the SD card to the J101 Carrier board.

sudo cp overlays/jetsonnano/jetson-sdmmc-overlay.dtbo /boot/
cd /boot/
sudo /opt/nvidia/jetson-io/ -l

After executing these command above, we should get the output similar (It may not be exactly the same. Depends on the peripheral and the drivers already installed) to the following and we know the SD card have been regognized:

    Header 1 [default]: Jetson 40pin Header
Available hardware modules:
1. Adafruit SPH0645LM4H
2. Adafruit UDA1334A
3. FE-PI Audio V1 and Z V2
4. MCP251x CAN Controller
5. ReSpeaker 4 Mic Array
6. ReSpeaker 4 Mic Linear Array
7. reComputer sdmmc
Header 2: Jetson Nano CSI Connector

Available hardware modules:
1. Camera IMX219 Dual
2. Camera IMX477 Dual
3. Camera IMX477-A and IMX219-B
Header 3: Jetson M.2 Key E Slot
No hardware configurations found!

Step 4. Name our device and Finish driver installation

sudo /opt/nvidia/jetson-io/ -n "reComputer sdmmc"

!!!Note You may need to reboot to run jtop after completing the installation for the first time.


Change SD card I/O speed

We provide SD card function on reComputer J101 carrier board, which supports CLK Frequency 48MHz. The CLK here is designed to achieve certificates (such as CE/FCC). If you want to increase CLK by yourself, you can use the instruction below.

  • Step 1. Clone this repository and modify the the code below.

    git clone
  • Step 2. Modify and Compile max-clk-limit value

    cd seeed-linux-dtoverlays
    sed -i '10s#48000000#208000000#' overlays/jetsonnano/jetson-sdmmc-overlay.dts
    make overlays/jetsonnano/jetson-sdmmc-overlay.dtbo
    sudo cp overlays/jetsonnano/jetson-sdmmc-overlay.dtbo /boot/
    sudo /opt/nvidia/jetson-io/ -n "reComputer sdmmc"
  • Step 3. Reboot


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