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Hans
Can AGP and PCI-66 be used simultaneously?
Posted on: 2007/9/13 20:51    #1
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This is related to this thread on ATI's recent decision to open up their hardware documentation.

There was a discussion a while a go about the PCI-66 slot and whether you could use it and an AGP card at the same time. I don't think that there ever was a definite conclusion. My interest in it is because, while none of the recent AGP cards will work in our AGP 2x slot (wrong voltage), there are a few PCI cards available. If it were functional, then we could possibly use these cards. however, for development it would help if an existing AGP card were also present as a backup.

So, does anyone have any experience with using this slot? Can AGP and PCI-66 be used simultaneouslty. Does the slot even work?

Hans
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ZeroG
Re: Can AGP and PCI-66 be used simultaneously?
Posted on: 2007/9/13 22:01    #2
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@Hans

There is nothing in the MOBO-Docs, but:

The AGP Slot in my A1-XE is used for a Radeon and i cant get it to start if i plug the sii0680 in the PCI-66 Slot.
If i remove the sii it is starting again.
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Hans
Re: Can AGP and PCI-66 be used simultaneously?
Posted on: 2007/9/13 22:08    #3
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@ZeroG

Quote:

ZeroG wrote:
@Hans

There is nothing in the MOBO-Docs, but:

The AGP Slot in my A1-XE is used for a Radeon and i cant get it to start if i plug the sii0680 in the PCI-66 Slot.
If i remove the sii it is starting again.


Probably because it's a 33 MHz card. The real question is if the same thing happens when a 66 MHz card is plugged in to the PCI-66 slot.

Another issue is if the firmware is able to cope.

Hans
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Rigo
Re: Can AGP and PCI-66 be used simultaneously?
Posted on: 2007/9/14 0:48    #4
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@Hans

IIRC the AGP shares the interrupt with the PCI66 slot, so in that case, no, you cannot use them both at the same time.

Simon
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joerg
Re: Can AGP and PCI-66 be used simultaneously?
Posted on: 2007/9/14 0:56    #5
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@Hans

Quote:

Hans wrote:

Probably because it's a 33 MHz card.
Are there really PCI33-only sii0680 cards?

Quote:
The real question is if the same thing happens when a 66 MHz card is plugged in to the PCI-66 slot.
As long as you have a card in the AGP slot as well it can't work. You can only use one of both.

Quote:
Another issue is if the firmware is able to cope.
U-Boot only executes the firmware of gfx cards.
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Hans
Re: Can AGP and PCI-66 be used simultaneously?
Posted on: 2007/9/14 1:12    #6
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@joerg

Quote:

joerg wrote:
@Hans

Quote:

Hans wrote:

Probably because it's a 33 MHz card.
Are there really PCI33-only sii0680 cards?

Silicon Image's own website claims that they're 33 MHz.

Quote:
Quote:
The real question is if the same thing happens when a 66 MHz card is plugged in to the PCI-66 slot.
As long as you have a card in the AGP slot as well it can't work. You can only use one of both.


Ok, that's what I wanted to know. Pity though. All my other slots are in use.

Quote:
Quote:
Another issue is if the firmware is able to cope.
U-Boot only executes the firmware of gfx cards.


Sorry, I meant U-Boot. If the hardware supports it, but U-boot doesn't, then it's not possible.

Hans
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joerg
Re: Can AGP and PCI-66 be used simultaneously?
Posted on: 2007/9/14 1:58    #7
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@Hans

Quote:

Hans wrote:
@joerg

Quote:

joerg wrote:

As long as you have a card in the AGP slot as well it can't work. You can only use one of both.

Ok, that's what I wanted to know. Pity though. All my other slots are in use.
The A1 has 2 PCI buses, one is used for the AGP and the PCI66 slot, the other one for the 3 PCI33 slots and the rest of the motherboard (VIA, eth3com, etc.). Since unlike PCI AGP is not a bus but a point-to-point channel it can't be shared with anything else. To be able to use all slots either the Articia would have had to support 3 buses (one for AGP, one for the PCI66 slot and one for the rest) instead of 2, or instead of the PCI66 slot a 4th PCI33 one, on the same bus as the 3 others, would have had to be used.

Quote:
Sorry, I meant U-Boot. If the hardware supports it, but U-boot doesn't, then it's not possible.
If U-Boot or AmigaOS4 wouldn't support the 2nd bus AGP gfx cards wouldn't work either ... For the drivers there is AFAIK no difference between AGP and PCI.
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