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Date: Tue, 24 Jul 2007 14:48:44 +0200 From: Helge Hafting <helge.hafting@...el.hist.no> To: vraghavan3@...l.gatech.edu CC: Nobin Mathew <nobin.mathew@...il.com>, linux-kernel@...r.kernel.org Subject: Re: Reading a physical memory location vraghavan3@...l.gatech.edu wrote: > Thanks for the quick reply. But I was wondering as to why I would have to map > the physical address to the virtual address when I know that the string is > permanently in the physical memory because its loaded into flash. Because that is how any CPU with a MMU works. All accesses to memory goes through page tables (virtual memory) - there is no alternative. But this is not a problem, as the kernel can map any physical address for you. > Is there a way > to directly read from the physical memory location? The way is to map the page containing that address. You can then read whatever you want from that page. Nothing is ever accessed by physical address, physical addresses is only used indirectly to set up the page tables. Helge Hafting - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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