On one corner of my driveway a 2x2ftx2ft hole developed, it is partially under my driveway

Either or both is fine. Just make sure you tamp them solid every foot or less, even if it's just you walking on each layer. You may, possibly, still end up with a depression in the corner, but that can be removed and re-filled with Cold Patch after everything has settled and been topped-off solid.
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