Re: CVS commit: src/sys/dev/ata

[jnemeth%victoria.tc.ca@localhost (John Nemeth)]

On Feb 25,  1:28pm, Wolfgang Solfrank wrote:
} Jonathan A. Kollasch schrieb:
} > On Wed, Oct 05, 2011 at 10:25:52AM +0200, Manuel Bouyer wrote:
} >> On Wed, Oct 05, 2011 at 03:40:18AM +0000, Jonathan A. Kollasch wrote:
} >>> Module Name:      src
} >>> Committed By:     jakllsch
} >>> Date:             Wed Oct  5 03:40:18 UTC 2011
} >>>
} >>> Modified Files:
} >>>   src/sys/dev/ata: wd.c
} >>>
} >>> Log Message:
} >>> Limit wd(4) transfers to 128 (512-byte) logical sectors, as the 
traditional
} >>> MAXPHYS value has for at least the past decade.
} >>
} >> We should be able to go safely up to 256 sectors. Anything larger requires
} >> LBA48, which is not supported by some controllers.
} >
} > Do we know how a real ST506 or similar ancient drive would respond
} > to such a command?
} 
} The ST506 was only a disk drive with no embedded controller logic.
} So it wouldn't respond to such a command at all, as it doesn't even see it.
} The command interface, after which the original ATA interface was modelled,
} was that of the WD1010 disk controller, to which this and similar drives
} would attach.  You would tell the controller the cylinder/head/sector

     And, I very much doubt there were any PCI versions of these
controllers since IDE came out well before the end of the ISA era.
Worrying about drives that old is pretty much pointless.  Even if you
could find one, it is very likely to be non-functional (these weren't
exactly high quality devices).

}-- End of excerpt from Wolfgang Solfrank