Messages in this thread | | | Subject | Re: NOMMU - How to reserve 1 MB in top of memory in a clean way | From | Catalin Marinas <> | Date | Wed, 06 Apr 2005 14:26:08 +0100 |
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Bas Vermeulen <bvermeul@blackstar.xs4all.nl> wrote: > I am currently working on the bfinnommu linux port for the BlackFin 533. > I need to grab the top 1 MB of memory so I can give it out to drivers > that need non-cached memory for DMA operations.
I did this long time ago (on a 2.4 kernel), trying to avoid a hardware problem. I re-ordered the zones so that ZONE_DMA came after ZONE_NORMAL. Since the DMA memory was quite small (less than 1MB), I also put a "break" before "case ZONE_DMA" in the build_zonelists_node() functions to avoid the allocation fallback.
-- Catalin
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