deeper?
I use the awl on my SAK to make shallow(1.5 in, 3.3 cm) holes... could bore from both sides to double that.
I've never had to do anything deeper than that, though I suppose a drill/auger bit welded to a US Army cleaning rod handle would be compact, and could be spun with a fire bow.
Square notches are made the same way V shaped notches are- only more so.
Make 2 cuts to edge the notch (| |), then slice out v shaped chips to get the notch (| \/ | )