On Thursday 27 March 2008, Larry Johnson wrote:
> It's clear now, but unfortunately I don't know enough to tell whether it
> is also correct :-( . The statement as now written implies that the
> statement without the clause, i.e., "Only Linux board ports in
> arch/powerpc with bootwrapper support will have to get fixed in Linux
> additionally", is also true. If this is not correct (because boards
> that do not recalculate their memory size do not need to be fixed in
> Linux), then you would write: "Only Linux board ports in arch/powerpc
> with bootwrapper support that recalculate the memory size from the SDRAM
> controller setup will have to get fixed in Linux additionally."
Now I'm confused. :)
Here is the current version I now have in my "master" branch (with your last
sentense):
- CFG_MEM_TOP_HIDE (PPC only):
If CFG_MEM_TOP_HIDE is defined in the board config header,
this specified memory area will get subtracted from the top
(end) of ram and won't get "touched" at all by U-Boot. By
fixing up gd->ram_size the Linux kernel should gets passed
the now "corrected" memory size and won't touch it either.
This should work for arch/ppc and arch/powerpc. Only Linux
board ports in arch/powerpc with bootwrapper support that
recalculate the memory size from the SDRAM controller setup
will have to get fixed in Linux additionally.
This option can be used as a workaround for the 440EPx/GRx
CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
be touched.
WARNING: Please make sure that this value is a multiple of
the Linux page size (normally 4k). If this is not the case,
then the end address of the Linux memory will be located at a
non page size aligned address and this could cause major
problems.
Please send a patch to change this description if necessary.
Thanks.
Best regards,
Stefan
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