Hey Guys. What would you say is the best memory allocation function to use when I want to dump a specific size and address of memory to a file? Im working through the PCI chip to gain access to a shared 8meg memory bank. What I essentially have to do is try and access that bank from memory start to a specific memory offset and dump all its containing data into a file as soon as possible. This is a quick sum of my great adventures to try and get PCI device data and register offsets. Im just summing this up so that you can see HOW I got to the PCI device info. First I run __init pci_init_module() and inside it the following. -alloc_chrdev_region() -MAJOR() -pci_cdev_init(); -pci_register_driver(); Then it seems to me like the just automatically runs the .probe function and it runs these functions. -pci_cdev-add() -MKDEV(); -cdev_alloc(); cdev_init(); cdev->owner = THIS_MODULE; -cdev_add(); dev_info(); pci_enabled_device(); Ok soo from here on I try and allocate / request regions of RAM. This is what I tried : pci_request_region(); and it failed miserably saying " BAR 3: Can't reserve [mem 0xe0800000 - 0xe0ffffff] also ioremap_nocache(pci_resource_start()); This works but it seems slow and I should copy register by register out of the ram? Is this the only way ? also ive tried using pci_set_dma_mask() ; which failed also with a return value of a really large value starting with 4. I wanted to paste my code but the last time I pasted it my Email had to be moderated and they never came back to me about it :( .