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Currently we check if the rootfs.img size is greater than 4 GB and use mcopy to copy it over to a hddimg, a FAT32 volume. This results in problems when IMAGE_ROOTFS_SIZE is set to be exact 4 GB (4294967296 bytes). mcopy uses the max offset/file size to be 4294967295 and as a result, it errors out without any warning to the user. Change the 4 GB check to '-ge' to catch these cases. Since we allow IMAGE_ROOTFS_SIZE to be in KBs, the maximum allowed is 4194303 KB. Also, tweaked the error message to refer to wic too. Fixes [YOCTO #12776] (From OE-Core rev: 16956dacd4be2c64e5816ccb2b222b5b128838c9) Signed-off-by: Anuj Mittal <anuj.mittal@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>