[lkml]   [2006]   [Nov]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: possible bug in ide-disk.c ( but also older)
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
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-11-20 19:01    [W:0.050 / U:3.736 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site