I've tested this grub for regressions, and it's happy here. As for the printf itself, while I don't have the right hardware to test on, it's identical to the printf in xenial and yakkety, so I see no reason to verify that specifically.
I've tested this grub for regressions, and it's happy here. As for the printf itself, while I don't have the right hardware to test on, it's identical to the printf in xenial and yakkety, so I see no reason to verify that specifically.