Re: [PATCH] Large "clipped" IDE disk support for 2.4 when using oldBIOS

From: Taisuke Yamada (tai@imasy.or.jp)
Date: Sun Nov 19 2000 - 17:13:25 EST

> > Earlier this month, I had sent in a patch to 2.2.18pre17 (with
> > IDE-patch from http://www.linux-ide.org/ applied) to add support
> > for IDE disk larger than 32GB, even if the disk required "clipping"
> > to reduce apparent disk size due to BIOS limitation.
>
> This patch is not good. It compiles, but when I boot the kernel, it
> decides to ignore the hdc=5606,255,63 parameter that I pass to the kernel,
> and limits the number of sectors to fill 8.4GB.

Please retest with hdc=... parameter removed. If hd[a-z]=...
parameter is specified, my patch will be disabled, trusting
whatever user has specified.

Here's a example output of what you should expect if the patched
part is being executed:

  hda: host protected area => 1
  hda: checking for max native LBA...
  hda: max native LBA is 90045647
  hda: (un)clipping max LBA...
  hda: max LBA (un)clipped to 90045647
  hda: lba = 1, cap = 90045647
  hda: 90045647 sectors (46103 MB) w/2048KiB Cache, CHS=89330/16/63, UDMA(33)
  hdc: host protected area => 1
  hdc: checking for max native LBA...
  hdc: max native LBA is 90045647
  hdc: (un)clipping max LBA...
  hdc: max LBA (un)clipped to 90045647
  hdc: lba = 1, cap = 90045647
  hdc: 90045647 sectors (46103 MB) w/2048KiB Cache, CHS=89330/16/63, UDMA(33)

> /*
> * Compute drive->capacity, the full capacity of the drive
> * Called with drive->id != NULL.
> + *
> + * To compute capacity, this uses either of
> + *
> + * 1. CHS value set by user (whatever user sets will be trusted)
> + * 2. LBA value from target drive (require new ATA feature)
> + * 3. LBA value from system BIOS (new one is OK, old one may break)
> + * 4. CHS value from system BIOS (traditional style)
> + *
> + * in above order (i.e., if value of higher priority is available,
> + * rest of the values are ignored).
> */ 

--
Taisuke Yamada <tai@imasy.or.jp>
PGP fingerprint = 6B 57 1B ED 65 4C 7D AE  57 1B 49 A7 F7 C8 23 46
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