Messages in this thread | | | Date | Mon, 21 Sep 1998 12:40:53 +0000 | From | Mark Lord <> | Subject | Re: IDE-Driver Update :: Testing Requested (Ultra33 as RAID?? (fwd)) |
| |
Martin Mares wrote: > > Hello, > > > I have one. > > > > The board uses a single PCI interrupt when in "native" mode, > > and a pair of interrupts when in "compatibility" mode (IRQ14/15), > > as do *all* compliant PCI IDE controllers. > > > > Note the confusion may simply be that a *single* "IDE controller" > > these days always supports *two* hwif's (interfaces). > > > > The Promise RAID card is identical to the Promise Ultra33 IDE card, > > except for a different on-board BIOS. > > I'm not sure about how does the IRQ compatibility mode work. The PCI bus > itself has no chance how to transmit any IRQ different from the standard > IRQ A/B/C/D pins. It must be either a planar device connected to non-PCI
IRQ compatibility usually is supported only on motherboard chipsets, where all IRQ pins are available.
Some add-on cards support it through use of an ISA "header" which plugs into an ISA slot via a ribbon cable from the PCI card.
Some PCI cards support it by using IRQA and IRQB, and having the motherboard BIOS route IRQA to IRQ14 and IRQB to IRQ15. -- mlord@pobox.com
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |