On 22.05.2010 20:54, Joe Korty wrote: > On Sat, May 22, 2010 at 12:54:08PM -0400, ron minnich wrote: > >> pci bridges have always rounded to 4k multiples ... it's in the very >> earliest spec. >> > > Thanks. It does seem that PCI-e uses more bridges than the older PCIs; > if so that would explain the excessive spreading-out of IO port addresses > under PCI-e. >
I think someone mentioned that some PCIe bridges can map IO port space to memory space to give non-x86 systems access to IO port space (many architectures do not have a separate IO port space). If you manage to find such a PCIe bridge chip with mem<->IOport mapping capability and if you can hack up Linux to use the memory accessor functions for the devices behind such a bridge, you can work around IOport resource space constraints. It would definitely be interesting to see if that is possible in paractice without breaking lots of stuff. Regards, Carl-Daniel -- http://www.hailfinger.org/ -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
