Re: physical memory access
Brian Gerst (bgerst@quark.vpplus.com)
Thu, 04 Mar 1999 10:26:38 -0500
root wrote:
>
> I wrote some information on the bios flash unused space using an eprom
> programmer.
> I know it's very dangerous but I can not do otherwise, and the bios
> seems not to complain
> about that.
> Actually my system is still working after replacing the flash but I
> can't read the things I wrote.
> I can reference only vitrual memory because I can't bypass memory paging
>
> (even using a kernel module).
> Is it possible to disable paging? Has anyone ever heard of a C function
>
> that stops paging or able to
> access actual physical addresses? Or is there a different way to do
> things?
>
> Thanks in advance.
Physical memory is 1:1 mapped at PAGE_OFFSET (normally 0xc000000 on the
x86). Just add PAGE_OFFSET to the address you really want to read.
--
Brian Gerst
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