Best idea I have so far is multiple 4GB files on the disk, and relocate /home to one of them.
I had the same idea but for another reason: If you update or modify the poky distribution through the BSP setup on a host computer, all your stuff in /home/root would be lost without copying the data from the old image to the new image.
So I created a home.ext3 file on the sd card and also created my own Poky meta layer for a permanent modification of /etc/fstab. So each time, after I changed something on the distribution, I can just copy the new image to the sd card and my old /home/root is still available and not touched.
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Isn't the SD card root mounted during start-up on the Galileo? I think I remember having used that to get easy access to files from the outside, but I kind of like the idea of a separate filesystem file for /home