Re: IDE from current bk tree, UDMA and two channels...

[Petr Vandrovec]

On  1 Aug 02 at 18:52, Alexander Viro wrote:
> On Fri, 2 Aug 2002, Petr Vandrovec wrote:
> 
> > > Uh-oh...
> > > 
> > > Let me see if I got it straight:
> > > 
> > > a) your disk doesn't work with half-Kb requests
> > > b) you have a partition with odd number of sectors
> > > c) hardsect_size is set to half-Kb
> > > d) old code worked since it rounded size to multiple of kilobyte.
> > > 
> > > Correct?
> > 
> > Yes, exactly. Replacing disk is not an option...
> 
> OK.  At the very least we need a way for driver to tell what the sector
> size is.  And that can be a problem - AFAICS IDE shares the queue for
> master and slave and sector size is queue property.
> 
> BTW, what type of partition table do you have there?

Normal DOS partition, with 512 byte block size, as this is 512B block
device, at least I believed to it until now. As start=63, it apparently
also handles 1024B requests on odd address (I believe that sfdisk -d dumps
start 0-based).

# partition table of /dev/hdc
unit: sectors

/dev/hdc1 : start=       63, size=12685617, Id=83, bootable
/dev/hdc2 : start=        0, size=       0, Id= 0
/dev/hdc3 : start=        0, size=       0, Id= 0
/dev/hdc4 : start=        0, size=       0, Id= 0

                                                      Petr Vandrovec