How to repair flaking paint

From looking at the pics, I don't think the walls are specially textured. Looks like typical "orange peel" finish from rolling on the paint. I think all you really need to do is fill the voids where the two layers of paint have been removed with some "Light Weight Spackle". Light weight spackle is very cheap and can fill small blemishes quickly and easily. Apply with a small putty knife, let it dry for 20 minutes then sand it or smooth it with a damp sponge. Get a sample of the color from the tape, or peel a small piece from the wall and get a pint mixed at any paint dept. Have the paint sales person determine what finish the paint is, I suspect egg shell or satin. You can use a mini roller or a soft brush to apply some over your patched areas, overlapping the undamaged color a bit. It may take a few light coats. Try to "feather" the edges into the existing color by using very light pressure on your roller or brush as you overlap the original color. Good Luck.

If there is six or seven layers of paint over the concrete then it will be sufficiently thick to be noticeable if you attempt to just scrape a single area and paint. It sounds as if a number of different people over the years have been putting off the dreaded inevitable conclusion that you should completely scrape and remove paint from the entire surface and repaint it with a proper exterior enamel approved for concrete.

When scraping paint always make sure to wear a dust mask as one of those layers may be lead based paint and it would be extraordinarily bad to breathe this in. When scraping keep children, animals and pregnant women away as they are particularly susceptible to ill effects from lead exposure.

Most hardware stores sell lead testing kits that will let you know if any of this scraped paint dust contains lead. A word of caution though that if you happen to verify and know that lead is in the paint then if you ever go to sell the place that you would be legally obliged to add this information to the sellers disclosure. Sometimes it is better to just treat the paint dust as if it contains lead and not know for your own sake.