Guys, Sorry for all the confusion, and subsequent traffic as a result of my mistakes. I'm still feeling my way with regards to programming the PCI and have mixed up terms and addresses. Just for the record : In actual fact the PCI code is writing physical addresses to the Base Address Register, eg 0x02000000. Then later on when the driver is initialising itself it reads the BAR and adds on KSEG1 : dev->base_addr = KSEG1ADDR(base_addr); It is this "dev->base_addr" that gets reported to me on boot up ( 0xA2000000 ) as being the base address of the device. The 0xC000 0000 I wrote in my first mail was from another problem I had been working and was somehow burned into my brain. There is nothing like someone questioning one's assumptions to make one re-evaluate those assumptions. For this I am grateful to those people, for spotting the gaping whole of my mistake and bringing it to my attention. For me at least it has been very useful in that respect. I still would like to understand PCI issues more particularly with respect to so called "legacy PCi devices" VGA, sound card etc. So if anyone would like to mail me off the list with tips / reading they have found useful, it would be most appreciated. Wayne __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/
