Messages in this thread | | | From | "Imran Badr" <> | Subject | DMA from high memory regions | Date | Tue, 25 Jun 2002 16:29:58 -0700 |
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Hi,
I am trying to setup DMA to/from user space. I get a user pointer in my device driver, from which I build up kiobuf and call map_user_kiobuf. After this, I call kmap to map pages to kernel virtual space and then virt_to_bus to get bus address. Now if I define CONFIG_HIGHMEM and that page happens to be in the memory region near 1GB then DMA never happens and I donot see any data in result pointer. If CONFIG_HIGHMEM is not defined, then everything works perfectly. Please suggest any solution.
Thanks, Imran.
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