On Fri, Feb 9, 2018 at 4:01 PM, Mathieu Malaterre <ma...@debian.org> wrote: > Hi Rob, > > I can no longer boot my old Mac Mini G4 using a custom config. After a > tedious bisect it appears that (*). Since Mac Mini does not provide > any serial port I cannot provide a kernel message dump (wish there was > some kind of null modem serial cable). All I can see is some crazy > stuff going on with ATA DMA/66 & DMA/100. > > Is there anything suspicious in this commit which may prevent this > machine to boot ?
Yes, it's broken. You need this patch. Sorry for the breakage. Rob  https://patchwork.kernel.org/patch/10208267/