Since the geometry rules for disk translations larger than 8.4GB do not
allow for 15 heads, he and I are discussing various options to account for
the error that IBM did.
The request is reasonable to add 15/16 combination, but the rule breaking
leaves us wondering some. Since this is a geometry issue and Andries is
primarily responsible for that part of the kernel, I will defer to his
judgement.
If you have a list of drive models and names they could be useful for
determining the action needed to address the problem.
On Tue, 4 May 1999, Alexander Viro wrote:
>
>
> On Tue, 4 May 1999, Andre M. Hedrick wrote:
>
> >
> > Patch will not be uploaded to the list......get it at ::
> > http://www.dyer.vanderbilt.edu/
> > server/udma/2.2.7.uniform-ide-6.19.delta.patch.gz
>
> Andre, while we are at it, could you apply the following patch to
> ide-disk.c? Bright IBM boys produced a large disk that reports
> 0x3fff*15*63 instead of 0x3fff*16*63. The patch below fixed the problem.
> TIA,
> Al
>
> --- ide-disk.c.old Tue May 4 04:21:48 1999
> +++ ide-disk.c Tue May 4 04:27:06 1999
> @@ -101,6 +101,15 @@
> id->cyls = lba_sects / (16 * 63); /* correct cyls */
> return 1; /* lba_capacity is our only option */
> }
> + /*
> + * ... and at least one TLA VBC has POS instead of brain and can't
> + * tell 16 from 15.
> + */
> + if ((id->lba_capacity >= 15481935) && (id->cyls == 0x3fff) &&
> + (id->heads == 15) && (id->sectors == 63)) {
> + id->cyls = lba_sects / (15 * 63); /* correct cyls */
> + return 1; /* lba_capacity is our only option */
> + }
> /* perform a rough sanity check on lba_sects: within 10% is "okay" */
> if ((lba_sects - chs_sects) < _10_percent) {
> return 1; /* lba_capacity is good */
>
Andre Hedrick
The Linux IDE guy
Candidate for pre-patch-2.2.8-1
http://www.dyer.vanderbilt.edu/server/udma/2.2.7.uniform-ide-6.19.delta.patch.gz
http://www.dyer.vanderbilt.edu/server/udma/2.2.7.uniform-ide-6.19.patch.gz
http://www.dyer.vanderbilt.edu/server/udma/ide.2.0.37pre11+pat7.gz
http://www.dyer.vanderbilt.edu/server/udma/hdparm-3.5i.patch.gz
APC UPS Daemon Support Center.
http://www.brisse.dk/site/apcupsd/
GPLed source on April 7, 1999
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