Hey all, 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've tried the following approaches (which each failed, in different ways): 1. Allocate 1 MB in ZONE_DMA. This doesn't work because ZONE_DMA needs to be in the bottom of memory (and I couldn't find a way around that), and needs to be a minimum of 4 MB. 2. Create ZONE_NORMAL with all memory in it, but add a hole of 1 MB. This crashes in the swapper somewhere. What I want is a way to cleanly grab all pages in the top megabyte of memory, so I can give them out in an implementation (to be written) of dma_alloc_coherent and friends. That top megabyte would be set to non-cached in the software cache manager. If anyone can point me in the right direction, that would be great. Regards, Bas Vermeulen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
