Messages in this thread | | | Subject | Re: A simple question about readw, readw and the like | Date | Sun, 30 Jul 2000 15:39:26 +0100 (BST) | From | Alan Cox <> |
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> Sometimes it is needed to let one PCI device do DMA to another part of > itself or another PCI device. For this, you need the bus addresses of > the PCI memory resources. If pci_resource_start(dev,x) doesn't give > you that, where else could it be found? By doing configure space reads > I guess, but is that really necessary?
Firstly you need to read the intel triton chipset and natoma chipset errata notes if you are doing this on x86. On non x86 you arent even guaranteed there is a common addressing between PCI busses so you may not be able to hit one bus from another
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