He barely did any drills. He was on limited participation during training camp and then was pulled from participation all together. He said multiple times in media scrums that his pain was not improving and in fact he felt like he was going to get injured, but he wrapped everything in his country boy aw shucks positive attitude that people didn't really pay attention to what he was saying. The hope was he'd be ready for full practice on 8/26 and he'd be able to get his missed reps in before the season started, but he planned to officially retire the day before that.
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That's from 8/15, just after camp ended, and it talks about IF Luck plays at all, it would be with lingering pain and he'd probably miss games and might not even play until into September. When you look at the progression of announcements and media reports/talks, you can see it go from
Excited for training camp
Luck on limited participation at training camp due to calf issue
Calf issue is also an ankle issue, Luck pulled from training camp after 3 days
Luck ruled out of pre-season due to calf/ankle issue, Luck saying to the press the pain was not getting better and he felt like there was a bad injury waiting to happen
Luck not practicing in pre-season due to calf/ankle issue
Colts hopeful Luck will be ready for regular season opener, willing to let him play at 85-90% if Luck can handle it, talk about pain threshold being a major obstacle in the situation
Colts GM doesn't say when Luck will return but hopes a change in rehab will allow him to prepare for the season opener that he had yet to do any practice for
Luck retires the day before they had tentatively penciled him in to begin practicing