How to read non-physical memory?

[Neel Natu]

Hi Alexandr,

On Sun, Jan 23, 2011 at 7:56 AM, Alexandr Matveev <timon at timon.net.nz> wrote:
> Hello.
>
>  When FreeBSD boots with 'boot -v' it show SMAP:
> SMAP type=01 base=0000000000000000 len=000000000009d800
> SMAP type=02 base=000000000009d800 len=0000000000002800
> SMAP type=02 base=00000000000e0000 len=0000000000020000
> SMAP type=01 base=0000000000100000 len=00000000bfdb0000
> <...>
> SMAP type=02 base=00000000fed1c000 len=0000000000004000
> <...>
>
>  Memory range 0xfed1c000 - 0xfed2000 belongs to ICH8 mapped to memory
> configuration registers.
>  If I correctly understand mem man page, /dev/mem allow to read only real
> physical memory. How can I read data from this range?

I am not sure what the man page says but you can certainly use
/dev/mem to access mmio space.

I have used 'dd' with 'if=/dev/mem' to dump out mmio registers on
amd64. YMMV with other architectures.

best
Neel

>
> --
> Alexandr Matveev
>
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