I'm trying to boot my BeagleBone Black into Angstrom using pre-built images found here. My SD card has two partitions BOOT & ROOTFS, and was formatted according to the procedures found here.

enter image description here

Below are the contents of both partitions:

contents of BOOT & ROOTFS

The lost+found folder was the result of formatting the SD card and I haven't been able to delete it. I don't think this would cause u-boot to hang.

However when booting, u-boot repeatedly tells me that it can't find /boot/uImage & /boot/am335x-boneblack.dtb:

boot-up sequence

The first of the following 2 images is my uEnv.txt, it uses load mmc 0:2 to both load these files. The second image is the result after attempting to use ext4load mmc 0:2 since the ROOTFS partition is formatted as ext4:

uEnv.txt entering uboot and using ext4load

The ROOTFS (mmc 0:2) partition contains the rootfile system, but when I attempt to list the contents of the /boot directory u-boot returns nothing. When I had the SD card plugged into my comp and mounted. I attempted to ls the /boot directory and denied permission despite using sudo.

listing the contents of my ROOTFS partition (mmc 0:2)

Why can't uboot locate the uImage and dtb files?

1 Answer 1


These are the classic symptoms of an old U-Boot trying to use a modern ext4 fs that has incompatible features. You need to run mkfs.ext4 with -O ^64bit,^metadata_csum for a U-Boot of that era to work with the filesystem.

  • Thanks @Tom Rini, that made it work, I reformatted my ROOTFS partition using your suggestion and that allowed for the kernel to boot. I have a lot to learn still.
    – Niko_Jako
    Commented May 30, 2020 at 0:12
  • FYI - "lost+found" that I mentioned in my second image, is most likely a partially recovered file that fsck found while fixing my uSD card. See the second paragraph in the Use section of the fsck wiki-page.
    – Niko_Jako
    Commented Jul 1, 2020 at 21:07

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