On Tue, Jan 24, 2006 at 07:16:43PM +0100, jfaslist wrote: > Problem: Need to arbitrary set a PCI bridge memory window (PCI CFG MEM > BASE and MEM LIMIT) > > I am writing a linux vme driver for a PCI-VME bridge (Tundra universe2). > The device is located behind a AMD8111 PCI bridge . > When linux comes up, it reprograms all the PCI bridges (previously set > by the firmware). The problem is that it only allocates a memory window > large enough to accomodate the space requirements of subordinate PCI > devices as defined by the BAR registers. My problem is that the Tundra > PCI-VME bridge "consumes" a lot of extra address space (not decoded by > its PCI BARs) for the purpose of accessing the VME bus. Accessing VME is > done by programming several windows on the PCI-VME bridge. Anytime a PCI > address falls in the programmed window is decoded, a VME access is done. > I need around 1GBytes to access VME. So I need to be able forward that > big a range to the PCI bus that holds the PCI-VME bridge. But the > problem is that the AMD8111 doesn't let me do it since it only allows me > to acces the registers of the PCI-VME bridge, as defined by the BARs. > Any idea, how I could force the AMD8111 PCI bridge to pass the 1GBytes > range to the PCI-VME controller? Fix the device to have the proper BAR settings? It sounds like this is a broken device... thanks, greg k-h -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
