Re: NOMMU - How to reserve 1 MB in top of memory in a clean way

[Catalin Marinas]

Bas Vermeulen <bvermeul@xxxxxxxxxxxxxxxxxxx> 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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