On Sun, Nov 29, 2009 at 12:38:55AM +1000, Adam Nielsen wrote: > I'm attempting to port the Linux kernel to an NCD HMX, an R4600-based X-Terminal. > > I've currently got it to the point where it will download the kernel > and execute it, and start printing some messages out on the screen. > > It gets as far as printing the physical RAM map and then crashes, > but I'm not sure why: > > Determined physical RAM map: > memory: 00800000 @ 40250000 (usable) > memory: 00040000 @ 9fc00000 (ROM data) > Wasting 8407552 bytes for tracking 262736 unused pages > > TLB refill exception PC = 40024094 address = 7FFFF000 > > The last message is from the boot monitor (the kernel is loaded at > address 0x40020000.) I'm just guessing with the memory map, but > I've tried lots of different values with the same result, and I'm > fairly sure there is RAM mapped to the address I have used above > (it's after the end of the kernel.) At any rate the error message > is from a completely different address, and it still happens if I > flag that area as reserved memory in the RAM map. Are you sure it's a R4600, not R4640 or R4650? It's like a decade that I last read up on these but afair they have a fixed mapping starting at 0x40000000. It would make perfect sense to use such a CPU in an X terminal. Ralf
