Hi !
On Au1550 code like yours works
I use ioremap_nocache(PhysAddr,length) to get access from kernel level.
For access from userland I don't set any vm_flags in drivers' mmap() ,
vma->vm_flags is set by kernel to 0x40FB (VM_IO is set and VM_LOCKED isn't).
And , as Dan said , pci_resource_* functions used for getting valid PCI memory address
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