[MIPS] 64-bit Sibyte kernels need DMA32.

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Sibyte SOCs only have 32-bit PCI.  Due to the sparse use of the address
space only the first 1GB of memory is mapped at physical addresses
below 1GB.  If a system has more than 1GB of memory 32-bit DMA will
not be able to reach all of it.

For now this patch is good enough to keep Sibyte users happy but it seems
eventually something like swiotlb will be needed for Sibyte.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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This commit is contained in:

Ralf Baechle 2007-11-03 02:05:43 +00:00

parent 940f6b48a1

commit cce335ae47

5 changed files with 83 additions and 37 deletions

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8

arch/mips/Kconfig

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31

arch/mips/kernel/setup.c

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37

arch/mips/mm/dma-default.c

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43

arch/mips/mm/init.c

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1

include/asm-mips/dma.h

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