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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  • 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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  • e

    It's always helpful when people post both the symptoms and the exact steps that resolved the problem. Hopefully this saves others from spending hours swapping cables, power supplies, and PCs before realizing it's the rpiboot setup that's causing the issue.

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