Re: Reading /dev/mem by dd

[Alan Cox]

> how does X11 get now direct access to the physical memory (instead of
> /dev/mem) ?

Via frame buffer devices.

If you think about things like hot-plug it's rather hard to do frame
buffer access any other way. The rules on memory types and aliasing also
make it nearly impossible to do properly with /dev/mem on a modern CPU.

Alan
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