[oe] Rootfs over 4GB

[Petr Nechaev]

Hi All,

 I'm using oe-core for building images and have a problem. rootfs.img is
over 5GB and cannot be copied to FAT32 partition because of file size
limit. This happens during do_bootimg task for core-image-sato-sdk. No
warning is given by bitbake.
 The problem occurs in build_fat_img() function in bootimg.bbclass.

 What is the technical reason behind putting rootfs.img to FAT partition?
 What is the right way of building core-image-sato-sdk with large rootfs?

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Petr