Re: memory management issue (Re: another regression on Efika)

[Robert Millan <rmh@aybabtu.com>]

Forwarding reply from Sven since he wasn't subscribed when it was sent.

On Fri, Jul 27, 2007 at 12:33:10PM +0200, Sven Luther wrote:
> 
> The efika has 128MB of builtin memory, and we know that everything above
> 24MB except a little heap at the top is free, so this should be enough
> for everyone, no ?
> 
> The 0 to 16MB area is also free normally, and the pre-powerpc kernel
> loaded themselves at 4 or 8 MB, and relocate the kernel at 0.
> 
> Using the 16MB to 24MB area is a big no-no though, since it would kill
> the firmware.
> 
> The efika/pegasos firmware is not able to relocate itself dynamically,
> and as it reserves the first 256MB (1 BAT area), but it could be used
> with a 128 MB (like the efika) or smaller memory DIMM, so it cannot
> reside on the top area of ram where it belongs.
> 
> There is a small stack going down from min(top-of-memory,256MB) of a
> couple MB though.
> 
> The efika/pegasos firmware furthermore runs in physical memory, and
> cannot switch to virtual memory.
> 
> Hope this helps, altough obviously i can make no prediction about future
> efika firmwares.
> 
> Friendly,
> 
> Sven Luther
> 

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