Re: Kernel 2.6.18 and above

[Mark Lord <liml@rtr.ca>]

Bartlomiej Zolnierkiewicz wrote:
> On Friday 20 April 2007, Benjamin Herrenschmidt wrote:
>> I'm CC'ing linux-ide... looks like the disk which you say is 20GB is
>> misdetected by the IDE layer as being 2GB.
..
>> And here you can see that the partition map tries to use about 20GB...
>> so there is a discrepancy between what the partition map says and what
>> the IDE driver says. I suspect old kernel just ignores the later, while
>> newer kernels enforce the limit which causes your problem.
>>
>> Bart, I'm a bit at lost as to why the device size would be misdetected,
>> do you have an idea ? Might be worth getting a dump of the ID block...
>> Mike, can you send us a dump of the binary file /proc/ide/hdb/identify ?
> 
> Since this is a 2.6.17->2.6.18 regression narrowing the problem down to
> the specific changeset (or at least -git or even -rc) seems like a most
> promising way in discovering the source of the issue.

Oddly enough, the IDENTIFY data that was posted shows this:

        CHS current addressable sectors:    4128768
        LBA    user addressable sectors:   40188960

So, using CHS it appears as a 2GB drive, but using LBA we get a 20GB drive.
Is something mistakenly using CHS instead of LBA ??

-ml