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Re: Trouble running in Dual bus boxes under NT
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: Trouble running in Dual bus boxes under NT
- From: v_chau@emulex.com (Vi Chau)
- Date: Mon, 2 Dec 96 12:09:08 PST
- Resent-Date: Mon, 2 Dec 96 12:09:08 PST
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-Id: <"K3kJj1.0.X43.CUpeo"@dart>
- Resent-Sender: pci-sig-request@znyx.com
lester@ixtapa.eng.hou.compaq.com Wrote:
>
> What address range can your device be mapped into. If your device
> must be placed below 1 MB then it must reside in bus 0. What is
> happening when the "unknown bus agent" claims the cycle is standard
> PCI protocol. The "subtractive decode agent" (the ISA bus controller)
> claims any cycle that is not claimed within four clocks on the PCI bus.
> It then runs the cycle on the ISA bus to see if anyone responds to it.
> If no one responds, it returns "FFFFFFFF".
>
>
The adapater card can be mapped anywhere within a 64-it address range. By the
way, NT maps it to FFFFFFFF_EFFFxxx; it's way up there.
Thanks to all the folks who replied with their ideas. I am going to continue
this investigation based on your ideas. In the mean time, if you find
out more, please share the info with everyone here. Thanks very much.
Vi Chau
Emulex Corp.
(714) 513-8132
v_chau@emulex.com
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