The ext4 image generated by Buildroot can make U-Boot crash once you wrote the image and then try to write a file into it. Notice this is hardware independent as it is reproducible on the U-Boot sandbox. See [1] for more details and the steps to reproduce it. U-Boot works fine if the ext4 image is generated with mkfs.ext4 (Hence my patch to use mkfs.ext4 instead of genextfs [2]) [1] https://lists.denx.de/pipermail/u-boot/2017-January/278827.html [2] https://patchwork.ozlabs.org/patch/734525/
This is fixed now that we use mkfs.ext4, since commit https://git.buildroot.org/buildroot/commit/fs/ext2?id=67aaa90d3bbe6ad5b5ffa9e66cdb0a1928448eb9. Thanks!