Ralf,
Thanks for the info! I still have a ocuple of question, hope you do not mind.
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"?
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?
cheers, -hdei