eMMC Flashing Difficulty on X651 | Geekworm's Forum
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eMMC Flashing Difficulty on X651

  • m

    Posting this information here in case someone else runs into the same problem.  I just bought an X651, and a CM4 with eMMC flash.  I had a lot of trouble flashing the eMMC with my Linux PC.  The process would always timeout and the kernel log would show USB bus resets.  I tried several different power supplies, USB cables, and different PCs.  What seemed to work for me was changing how I ran the rpiboot utility.  Specifically following their readme worked:

     git clone --recurse-submodules --shallow-submodules --depth=1 https://github.com/raspberrypi/usbboot
     cd usbboot
     make
     sudo ./rpiboot -d mass-storage-gadget

    On my earlier attempts, I had not done a recursive git clone, and I was only running 'sudo ./rpiboot'.  After following the above instructions, the RPI imager showed the device as "mmcblk0 Raspberry Pi multi-function USB device" instead of "RPI-MSD -0001".  This allowed me to flash the device quickly and reliably.

    Hope this hels someone else.

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  • Jarrod Jaiz

    It helps me a lot. Many thanks.
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  • a

    Good catch. In my experience, when the CM4 appears as `RPI-MSD -0001`, flashing can be hit-or-miss depending on the host system. Using the full rpiboot setup with the required submodules often resolves detection and stability problems. 

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  • AS

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