Re: physical address?

Ankit Jain
2004-10-08T12:05:16Z

thanks a lot for helping all the way

see inline

--- Jim Nelson <james4765@verizon.net> wrote:
> Ankit Jain wrote:
>
> >hi
> >
> >http://www.xml.com/ldd/chapter/book/ch02.html
> >
> > 00000000-0009fbff : System RAM
> > 0009fc00-0009ffff : reserved
> > 000a0000-000bffff : Video RAM area
> > 000c0000-000c7fff : Video ROM
> > 000f0000-000fffff : System ROM
> > 00100000-03feffff : System RAM
> > 00100000-0022c557 : Kernel code
> > 0022c558-0024455f : Kernel data
> > 20000000-2fffffff : Intel Corporation 440BX/ZX -
> >82443BX/ZX Host bridge
> > 68000000-68000fff : Texas Instruments PCI1225
> > 68001000-68001fff : Texas Instruments PCI1225 (#2)
> > e0000000-e3ffffff : PCI Bus #01
> > e4000000-e7ffffff : PCI Bus #01
> > e4000000-e4ffffff : ATI Technologies Inc 3D Rage
> LT
> >Pro AGP-133
> > e6000000-e6000fff : ATI Technologies Inc 3D Rage
> LT
> >Pro AGP-133
> > fffc0000-ffffffff : reserved
> >what is it reserved for?
> >
> >if somebody can explin me this:
> >
> >"Once again, the values shown are hexadecimal
> ranges,
> >and the string after the colon is the name of the
> >"owner" of the I/O region. "
> >
> >
> >
>
> What you are seeing is the remapped I/O space for
> various components in
> your computer. During bootup, the kernel scans the
> various buses and
> identifies various devices. Each driver remaps the
> I/O space for PCI
> devices - "they are physical addresses in that those
> memory addresses do
> map to real devices, but they are not real memory
> addresses."

what do u mean by this? they are physical address but
not the real memory address? what do u mean by
physical address then?

>
> IIRC, the "reserved" area is the remapped kernel
> address space - they
> set it up to remap to the top of the 32-bit memory
> address range in
> order to allow hard-coded function calls - it is
> faster to hard-code the
> function calls than to maintain symbol tables.

what is hard coded funtion calls? is it something like
stting the pointer to starting location?

> I see this computer is a laptop - now I understand
> why you are reluctant
> to upgrade the RAM.

what tells that this is a laptop?

> >thanks
> >
> >ankit
> >
> >
>
>

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