Paul,
What do you think about adding a condition to the "boots" test that stipulates that the board needs to boot 3 times?
I was looking at: https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AkxwyUNxNaAadDE1Ml... and found that the "boots" column should have probably been yellow for a bit based on bug https://bugs.launchpad.net/linaro-android/+bug/900681 which I see again on iMX53.