[LinuxBIOS] Question about protect mode?
juergen127 at kreuzholzen.de
Sat Jun 2 15:54:12 CEST 2007
On Saturday 02 June 2007 10:25, Yu-ning Feng wrote:
> Please check whether I have understood correctly.
> The processor lauches a cycle with address = 0xFFFF_FFF0. The north
> bridge chipset explains this address. In this case, it signals the
> read line and chip select line which connect the ROM device, and
> select an address of the ROM device through PCI bus AD[31..8]. To the
> north bridge, the ROM device is like a common BIOS ROM except that it
> uses PCI bus to exchange information. Then the ROM device uses
> AD[7..0] to send 1 byte of data back to the north bridge. That 1 byte
> of data is a portion of the 1st instruction.
This could be a valid scenario, yes.
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