Messages in this thread |  | | Date | Mon, 20 Nov 2006 18:57:21 +0100 | Subject | Re: possible bug in ide-disk.c (2.6.18.2 but also older) | From | Andreas Leitgeb <> |
| |
On Mon, Nov 20, 2006 at 05:28:12PM +0000, Alan wrote: > > Alternatively, a kernel-option to manually disable hpa-checking > > would be a good step to solve the problem even for drives like mine. > It's a compile time option. If you don't have GPT partitioning support > then the system ought to behave correctly.
To me it now seems that my symptoms have twofold cause: -) misinterpretation of that drive's reported number of sectors. -) accessing the last reported sector in search for a GPT.
If I turn off GPT, then perhaps the last (non-existent-but- believed-by-the-kernel-to-exist) sector is likely never ever accessed, and therefore the dma-switching-off doesn't happen. (Well, at least not at boot time, but still, if anyone did "dd if=/dev/hda ..." without limiting count=...)
Otoh, patching out this "addr++;" leads to the GPT-test to access a valid (in HD's view) sector which contains (who knows, I even might have a GPT without being aware) or doesn't contain a GPT, but anyway everthing works.
This does make sense to me. Please let me know if this makes no sense to anyone really knowing ide-stuff.
PS: If it weren't that the failure to access that last sector caused dma to be turned off, I'd never have noticed anything special. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |