Addressing PCI memory

[Amelia De Vivo]

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);
    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?
Thanks in advance

Amelia


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