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Re: HPDI register mapping
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: HPDI register mapping
- From: roy@roke.com (Roy Gwinn)
- Date: Wed, 1 Apr 1998 11:23 +0100 (BST)
- Delivered-To: pcisig@teleport.COM
- In-Reply-To: <36CA1104.DBA60540@acres.com.au>
- Reply-To: roy@roke.com
- Resent-Date: Thu, 1 Apr 1999 03:01:13 -0800
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-ID: <"vkNHM1.0.Wv2.uYq0t"@electra.znyx.com>
- Resent-Sender: pci-sig-request@znyx.com
> I have written appropriate addresses to these to
> try to map the registers to CPU address space.
You shouldn't change the contents of the BAR's. The PCI BIOS sets it up.
( you are allowed to poke FF's if you need to discover the extent of the
allocation, so long as you put it back how it was. )
The addresses in BAR's are physical addresses. For 86 family, you need to
map the physical address into linear address space before the processor can
see it. Call DPMI.
Roy Gwinn