Re: More questions about memory

[Roman Z. <zi...@li...>]

Hi,

Alan Buxey wrote:

> under APUS, what does phys_to_virt operate on?

Only on the main memory.

> I'm sure that my memory starts at 0x66000000 and that APUS
> looks at the execption vectors at 0xfff00000 (the last is certainly
> true according to the kernel sources! ;-) )

At 0xfffxxxxx you can access the last 512KB of your memory on the ppc
board. This is used to keep a copy of the exception vectors there. At 0
is already the chip ram, which could also be used, but it would only
slow down the exception handling.

> do we have a value of KERNELBASE or MEM_OFFSET that operate under
> APUS?

It's the same as for all other ppc machines - 0xc0000000. It's just that
the physical memory location is dynamic.

> if phys_to_virt isnt working normally, then what function do I use
> to replace
> 
> start_val = phys_to_virt(0x1200);
> 
> start_val = 0xfff01200;   ??

The exception vectors are directly mapped and can be accessed at
0xfff00000, so no conversion is needed for them. 

> Thanks if anyone can help....I'm getting worried about no responses from
> this list

Sorry, busy, busy... :)

bye, Roman