Addressing PCI memory

Gabriel Paubert paubert at
Wed May 16 03:02:28 EST 2001

On Tue, 15 May 2001, Amelia De Vivo wrote:

> Hi all, I'm trying to write a driver for a 64 bit PCI device. Something like
> this works well under i386 Linux, but it doesn't work at all for Linux
> 2.2.15 by Yellow Dog:
>     struct pci_dev *dev = NULL;
>     dev = pci_find_device(vendor, device, dev);
>     pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &cards[0].addr0);

First, use the resource in the dev structure, they do not necessarily
correspond to the value read from the base, even on Intel BTW.

	cards[0].addr0 = dev->resources[0].start

don't even need to mask the address bits...

Report again if the problems  persist.

>     cards[0].vaddr = (void *) ioremap((cards[0].addr0 &
> PCI_BASE_ADDRESS_MEM_MASK), cards[0].size);
>     writeb('A',(cards[0].vaddr)+0x1000);
> I have a kernel panic on writeb. Has someone some suggestion?


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