Messages in this thread |  | | Date | Mon, 16 Dec 1996 13:50:43 +0100 (MET) | From | Hans Lermen <> | Subject | Re: /dev/kmem /dev/mem PATCH for kernel 2.1.15 |
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On Mon, 16 Dec 1996, Marcin Dalecki wrote:
> Just recently someone created an device with major number 1 and minor > number 0. It was called ram but that's exactly what /dev/mem is supposed ^^^ ^^^^^^^^ > to do: read the physical ram mapping.
I guess you mixed the things a bit ;-)
MAJOR 1, MINOR 0 /dev/ram0 == block device, == ramdisk ^^^^^ ^^^^ MAJOR 1, MINOR 1 /dev/mem == character device, == memory device ^^^^^^^^^
> The virtual address space should be > accessed by /dev/kmem (see man 2 kmem or man 2 mem for confirmance.)
... better see linux/Documentation/devices.txt:
1 char Memory devices 1 = /dev/mem Physical memory access 2 = /dev/kmem Kernel virtual memory access
( this always is the actual source for device assignments )
Hans <lermen@fgan.de>
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