On Tue, Dec 14, 2004 at 01:26:55PM +0900, Hdei Nunoe wrote: > >In 2.4 the support for CONFIG_DISCONTIG and CONFIG_NUMA are a bit tangled > >with each other because IP27 is the only platform to uses these features > >and it needs both. > > Is it named "sgi-ip27"? Yes, obviously :-) > >Other than that you can also just setup your system > >as 0x0 - 0x10000000 being RAM, 0x10000000 - 0x20000000 being reserved > >memory and 0x20000000 - 0x30000000 being highmem. Which works but is a > >bit wasteful. > > The gap in physical memory is 0x10000000 - 0x20000000, but it is > 0x90000000 - > 0xC0000000 in virtual memory because there is K1 segment. So the macros > such > as __pa() or __va() does not work, I think. Started to wonder it might not > be easy > as just changing the PAGE_OFFSET value. Do you see? PAGE_OFFSET is the difference of a ZONE_NORMAL's virtual address and it's physical address. Once there is no more 1:1 mapping between physical and virtual addresses such as in your suggestion PAGE_OFFSET can no longer be used, that is you need to rewrite all users of this function. Ralf
