2GB address space limit on 32-bit PowerPC Macintosh

Dan Malek dan at embeddededge.com
Tue May 17 01:52:38 EST 2005

On May 16, 2005, at 11:05 AM, Benjamin Herrenschmidt wrote:

> I suppose it would add about ... 1 instruction :)

It's a little more than that :-)

> But I agree that we don't abolutely _need_ to break everybody. Maybe a
> better compromise would be to have the default beeing per CPU family ?
> 6xx/7xx/7xxx could default to 3G and 8xx stay at 2G...

That's still going to break nearly every embedded board.  My point is
that is all configurable for each individual board, so if you want that 
be the default for a board, then just update the defconfig for that 
The PMac is only one "board" out of many we support, and I don't think
it should be considered the default or generic configuration any more
than any other board.  The PMac is the easiest to update because it's
a single configuration file.  If you want that to have a 3G default task
space, then update that one configuration file.  As we have time we
will update all of the others, and when we get to the point where most
boards are of that configuration, we'll make it the default and the
minority of boards become the special cases.


	-- Dan

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