>>>>> "Mandeep" == Mandeep Singh Sandhu <mandeep_sandhu@infosys.com> writes: Mandeep> 1) where does the PCI configuration space actually reside on Mandeep> the hardware? is it the sitting on the PCI controller or Mandeep> on the memory of the NIC itself? Can be either one or a combination. Mandeep> 2) where is the PCI I/O & Memory space usually mapped? is it Mandeep> mapped to a certain portion of the RAM? PCI I/O space is usually mapped to IA-32 I/O space (i.e. in[bwd]/out[bwd] insns). PCI Memory space is mapped to a physical address. On non IA-32 architectures I/O space is mapped to a physical address too. Mandeep> 3) When the PC boots up does my system BIOS configure these Mandeep> memeory regions i.e is there some place from where my Mandeep> driver can get an info as to what all memeory regions have Mandeep> been requested by a NIC? *If* the BIOS did this (e.g. when "Boot with PnP OS" is false), these regions (as well as IRQs) can be obtained by reading configuration space header. Mandeep> 4) When my ethernet driver does a probe can it rely on the Mandeep> BIOS (under intel arch.) to provide it with some usefull Mandeep> info? Generally not, because BIOS can be instructed not to configure peripherals. ~velco -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
