Re: /dev/mem contains physical memory addresses?
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On 7/6/06, Daniel Rodrick <daniel.rodrick@xxxxxxxxx> wrote:
Hi list, I read that the /dev/mem represents the memory of the system. 1) Does that mean I can if start reading from /dev/mem, I can read any portion of the memory? 2) If I read at offset "n" in the file /dev/mem, would I be reading contents of the PHYSICAL memory address "n", or the VIRTUAL memory addtress "n"?
You'll be accessing only PHYSICAL since VIRTUAL addresses are not unique and global. But, its possible that the physical memory that you're accessing is a part of the virtual address space of some user program running in the system. Jinesh. - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs