On Fri, Jan 28, 2000 at 03:32:22PM -0700, Jeff Harrell wrote:
> I have question concerning the memory configuration variables in the
> MIPS/Linux codebase. I am working on a board that has 64Mbytes
> (0x400 0000) of SDRAM. We are using an R4000 core and have the memory
> map setup so that KSEG0 & KSEG1 both map to address 0x0 in physical
> memory. On our embedded system we are going to hard code the variable
> mips_memory_upper (This eventually is stored in memory_end). My
> question is what I should initialize the value to? Do I treat the top
> of memory as KSEG1 + 64Mbytes? (i.e., 0xA400 0000) or do I initialize it
> realative to 0? If anybody has any insights in this area, any
> information would be greatly appreciated.
I killed mips_memory_upper in 2.3.27. Now the kernel uses the same
bootmem functions as the other machines to implement that functionality.
I suggest you take a look at arch/mips64/sgi-ip27/ip27-memory.c for
a simple example how to use this interface.