[FreeBSD] FreeBSD 4.2 rosszul ismeri fel az ATA66/ATA100-at?

[Gyenes Istvan]

On Tue, 3 Apr 2001, Attila Nagy wrote:

> Hello,
>
> > Nem tudom, nem mi vagyunk Soren Schmidt (ő tudja egyáltalán?:)))), de
> > nem működik, és kész.  A szabvány szerint működnie kellene UDMA66-on,
> > ha nem minden eszköz támogatja a kábelen?
> Ha jol tudom ez meg az SCSI buszon sem mukodik, ugyhogy ketlem, hogy az
> ATA-nal menne...
>
> De lehet, hogy rosszul tudom.


Hali,

Szerintem is valahogy igy van. Legalabbis amit talaltam a kovetkezo:

4.4.  Are old IDE drives compatible with EIDE and U-ATA interfaces?

  This should work fine.

  Older drives do not support the high-speed advanced transfer modes
! defined by ATA-2 and, later, Ultra-ATA. To retain compatibility with
! these drives, ATA-2 and Ultra-ATA interfaces have programmable timing.
! The driver or BIOS queries the drive regarding its maximum transfer
! rate and will configure the interface to match. A few interfaces are
! jumper configurable in which case the responsibility is yours.

  If you intend to put an older drive on the same cable as an ATA-2
  drive, you may want to verify that your interface is capable of using
  independent timing for master and slave device. Otherwise, your old
  drive might end up slowing down your newer one because the controller
! is forced to use the lowest common speed. Modern interfaces like the
! Intel PIIX3 (430HX and VX and 440FX chipset), PIIX4 (430TX chipset)
! and, to a lesser extent PIIX (430FX chipset) don't suffer from this
! problem.


Na most, hogy ki kivel komaptibilis az ugye meg kerdeses.
Javitsatok ki ha tevednek. De szerintem a fentebb emlitett dolgok 66/100
-ra is ervenyesek. A sajat tapasztalataim is hasonloak voltak.

--
frts