On Sat, Feb 19, 2005 at 06:28:45PM -0800, P. Sadik hit keys to express the following: > I have a PCI card with RAM mapped through BAR 0. What is the best way to > add this memory to the kernel from the device driver? Is the following > sufficient? > > mem_start = pci_resource_start(struct pci_dev *mydev, 0); > mem_len = pci_resource_len(struct pci_dev *mydev, 0); > > add_memory_region(mem_start, mem_len, ??) It would be better if you can give more details. Your PCI card has, say, 2MB memory, inside the card and you want to map it into kernel? Or your pci card can address 2MB memory and you want to get that memory assigened to the card? In the latter case, you will be better off by pci_request_region(). In the former case, you might want to use vmalloc() for contiguous logical address and then program the bar with that address. The accesses to this area should be handled by the device (hopefully, but it works for us). HTH, Om. -- In my end is my beginning. -- Mary Stuart, Queen of Scots -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
