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