On Thu, 2007-06-28 at 12:20 +0200, Marian Balakowicz wrote: > Hi, > > Trying to change PCI IO window base for 52xx target I found that > we are pretty much limited to a "0" offset only. > > pci_process_bridge_OF_ranges() will not process any IO range that has > addresses set to anything else. > > 956: case 1: /* I/O space */ > 957: if (ranges[2] != 0) > 958: break; > > When this range[2] checking is removed from > pci_process_bridge_OF_ranges() kernel boots ok with the non-zero PCI IO > base, but the PCI device I am using (e100) will not work. > > I guess that with the above dropping of non-zero based PCI IO ranges > this is not supposed to be working. But does anyone know why?
We just fixed that for 64 bits but 32 bits still has the limitation. Note that it's not a very good idea to have your IO range at !0 if you're going to use anything ISA-like, such as a VGA video card or other legacy devices behind a PCI southbridge or SuperIO. Ben. _______________________________________________ Linuxppc-dev mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-dev
