I was working on using a grub-efi system image for aarch64 and I got the following error: 'Error: FAT sector size mismatch (fs=1024, dev=512)' I traced it back to u-boot¹. u-boot wouldn't chainload grub if the device block size and the filesystem sector size doesn't line up. I changed the line in (gnu build image) in make-vfat-image to use '-S 512' for esp partitions and was able to load the grub menu from u-boot.
I spent some time looking through the git history but I wasn't able to find anything to suggest why we have 1024 byte sectors there specifically. ¹ https://source.denx.de/u-boot/u-boot/-/blob/master/fs/fat/fat.c#L589 -- Efraim Flashner <[email protected]> אפרים פלשנר GPG key = A28B F40C 3E55 1372 662D 14F7 41AA E7DC CA3D 8351 Confidentiality cannot be guaranteed on emails sent or received unencrypted
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