Messages in this thread | | | Date | Mon, 30 Oct 2006 09:43:42 +0100 | Subject | Re: [PATCH 2.6.19-rc1 full] drivers: add LCD support | From | Franck Bui-Huu <> |
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Miguel Ojeda wrote: > > Sorry, I meant: You can't mmap a RAM address using functions like the > usual remap_pfn_range (as such functions doesn't like physical RAM > addresses, they want I/O ports for example, like 0x378). So, you can't > use smem_start. You need to code your own mmap & nopage function. (It > is explained in LDD3 very well). >
well I must admit that I don't understand why... I suppose you refered to that section in ldd3:
An interesting limitation of remap_pfn_range is that it gives access only to reserved pages and physical addresses above the top of physical memory.
I take a quick look at the implementation of remap_pfn_range() and there's no such limitation I can see (fortunately).
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