Hi All, I am currently working on the realtek driver available in http://linuxgazette.net/156/jangir.html. When I run the driver, pci_request_regions is erring out as : Device enabled ---------------------------------------------------------------- Base 0 Starting Address = 9c00 End Address = 9cff Length = 256 This Port is I/O mapped. It is NON Prefetchable.This is readable and writable. Base 0 starting Address = 9c00 End Address = 9cff Length = 256 resource is not available Base 1 Starting Address = fdaff000 End Address = fdaff0ff Length = 256 This Port is Memory mapped. It is NON Prefetchable. This is readable and writable. Reading the PCI BAR registers Checking the PCI BAR registers for Memory mapped flag Calling pci_request_region 8139too 0000:04:03.0: BAR 0: can't reserve I/O region [0x9c00-0x9cff] Could not get PCI region sys_init_module: 'real3'->init suspiciously returned 1, it should follow 0/-E convention sys_init_module: loading module anyway... I am attaching the driver code. Any clues as to why? Thanks & Regards, D.Giriprasad