Re: why inter-changing pci slot works?
- From: phil-news-nospam@xxxxxxxx
- Date: 28 Dec 2006 11:45:07 GMT
On Thu, 28 Dec 2006 07:29:36 +0530 Himanshu Chauhan <hs.chauhan@xxxxxxxxx> wrote:
| David Schwartz wrote:
|> Himanshu Chauhan wrote:
|>
|>> Hello group!
|>>
|>> Sometime it happens that two adjacent PCI cards don't work. But as you
|>> interchange their slots. The pair starts working. Why is it so?
|>>
|>> Is it related to the priority of the IRQs?
|>>
|>> Thanks
|>
|>
|>
|> It would help if you were more specific. For example, when you say
|> "interchange their slots" do you mean swap the two devices? Or move one
|> of the devices to an empty slot? What devices?
|>
|> DS
|>
|
| Okay, to be more specific sometimes back I had an internal modem card on
| slot 1 and soundcard on slot 2. They didn't work with that arrangement.
| I swapped the cards then and both of them were working. Recently, I put
| the ethernet card in the second slot. It didn't work. I just changed its
| position to the 3rd slot and it worked! This time it is the only card so
| I think IRQ consideration is out of question. Right?
It's definitely (still) time for a whole new computer I/O architecture
design that does not involve interrupt identification separate from the
device identity. The original IRQ was supposed to be a priority level
on a very small machine with few devices. That's just a mess for today's
needs. What we need is a machine with each device having a unique ID
that spells out both it's memory address range as well as it's interrupt
ID (being the same ID). Maybe that would be an ID bound to a slot or
maybe it would be settable on the boards. The OS can then map those
devices as needed.
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