On Sun, 2011-04-17 at 20:37 +0100, Ben Hutchings wrote: > On Sun, 2011-04-17 at 14:28 -0500, James Bottomley wrote: > > I traced the module loads and successful inits and found it; it's > > pata_cmd64x ... it loads but never returns from init. I bet it's > > trying to poke into ISA space which causes the HPMC. > > > > Removing this one module from the system allows it to boot again. > [...] > > We also had a recent report that this driver is also bust on some sparc > systems. We could swap back to cmd64x on these architectures but I > would rather get pata_cmd64x fixed. Well, I've got a working pata_cm64x (and now a working CD drive). The specific issue on parisc (and probably sparc) is that we're using this siimage chip hard wired to a single DVD drive. We have no use for a secondary port, so there isn't one. The registers for the secondary port are pointing off into empty space. When libata-sff tries to touch the secondary port, we get an instant High Priority Machine Check because on most non-x86 systems, it's a fault to touch non-responding memory. I got it to work by making libata-sff only probe a single port. Now, here's the problem: the libata-sff driver is hardwired to probe two ports, so it will require major surgery to check dynamically how many ports there are ... and the second problem is that I don't even know how to check this. I'll ask about this on linux-ide. James -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
