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Use coherent mapping for DMA on arm. This is propably suitable for the
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Description

Use coherent mapping for DMA on arm. This is propably suitable for the
other archs, but I can't test it so I made it conditionnal on arm
for now.

Approved by: re (blanket)

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cognetAuthored on
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rS171623: Handle supersections and L2 cache.
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head/
sys/
dev/
em/

rS171624

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head/sys/dev/em/if_em.c

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