Dear Maintainer,
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On this machine, I use an F2FS on /dev/mmcblk0 (/dev/mmcblk0p1) as the rootfs.
Since the current grub-probe does not support extracting UUID from F2FS, the
rootfs info written to grub.cfg is the device path of the rootfs
(/dev/mmcblk0p1). If grub-probe can support f2fs, the generated grub.cfg may
become more portable.