m68k: Increase initial mapping to 8 or 16 MiB if possible

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If the size of the first memory chunk is at least 8 or 16 MiB increase the
initial mapping to 8 resp. 16 MiB instead of 4 MiB.
This makes it possible to
  1. Map more memory in the first node without running out of space for the
     page tables,
  2. Boot kernels that don't fit in 4 MiB (e.g. multi_defconfig).

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>

  - Add support for 8 MiB,
  - Store initial mapping size in head.S for later reuse,
  - Add comment about large kernels.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

...

This commit is contained in:

Andreas Schwab 2014-04-24 12:24:48 +02:00 • committed by Geert Uytterhoeven

parent 44074e892c

commit 486df8bc46

2 changed files with 23 additions and 6 deletions

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19

arch/m68k/kernel/head.S

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10

arch/m68k/mm/motorola.c

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