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Cards that can master in 64-bit space??
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Cards that can master in 64-bit space??
- From: John Wisneski <johnw@kiowa.fc.hp.com>
- Date: Tue, 17 Sep 96 17:45:33 -0600
- Resent-Date: Tue, 17 Sep 96 17:45:33 -0600
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-Id: <"u4g3c1.0.yK3._WpFo"@dart>
- Resent-Sender: pci-sig-request@znyx.com
Hello PCIers,
I have a question about cards that can MASTER transactions on the PCI
bus. At system configuration time, how can I determine the address
capability of the PCI cards in the system (i.e. can it MASTER transcations
in 64-bit address space or only 32-bit address space)?? How do I know if
the MASTERS are 64-bit capable through DAC or as true 64-bit cards?? There
are ways to tell the card's SLAVE address capabilities (through Base Address
Registers), but I don't see similar info defined for bus MASTERSHIP. If
I want to configure some resource (memory, peer-to-peer slave, etc.) above
4Gbytes, then how do I know if the bus MASTERS will be able to reach
that space? I need to configure the resource before/during boot time,
so I can't rely on any driver intelligence that may come later.
Thanks for your time,
John Wisneski
------------------------------------------------------------------------
John Wisneski
HP
(970)229-2952
johnw@fc.hp.com
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