Indira, you can read the following online book, it gives brief intro to PCI Subsystem as well and its initialization. This might not help you in whole, but can be of some help. Link: http://www.tldp.org/LDP/tlk/tlk.html --gd On 4/15/05, indira <indira@xxxxxxxxxx> wrote: > > thanks saroj, > > I am bit confused. > > 1) The PCI conf space will contain registers like vendor ID,device ID ..... > will vendor doesnot provide this. > > 2) so inside a PCI peripheral we have this PCI conf space .Is it that I am > telling PCI subsystem that to allocate some address space for the > device.If it is so then we have a conf register like Interrupt pin register > and interrupt line register if we fill this then we tell PCI subsystem to > route our interrupt on this line using interrupt controller. > > 3)If we doesnot provide the base address registre value then is it that PCI > subsystem will provide the address for the PCI device in the system memory. > > 4) Please tell me the functionality of pci subsystem as I am beginner in > this area. > > thanks > indiraa > > At 03:54 PM 4/19/05, you wrote: > > > >On 4/15/05, indira <<mailto:indira@xxxxxxxxxx>indira@xxxxxxxxxx> wrote: > >> > >>Dear all, > >> > >>I studied that every PCI peripheral has got 3 address spaces : 2 only > > > > > > > >>1) Memory > >>2)I/O > > > > > > > >>3)PCI configuration space is for PCI devices to give informastion to PCI > >>subsystem > > > > > > > >>. Is it that PCI configuration space is > >>within the PCI device where configuration registers are implemented? yes > >> > >>when linux system boots, > > > >PCI BIOS > >>it detects PCI devices and will reads this > >>configuration space and creates memory for the device in the PCI memory > >>address space or in PCI I/O address space. > >> > >>will the system memory has this PCI related address spaces > > > > > > > >> and also will > >>the linux kernel map the configuration registers into its PCI subsystem > >>space > > > > > > > >>related > >>space. > > > > > > > >>How it will maintain the device related information. see pci_dev structure > >> > >>I read that some configuration registers are filled by vendor and the > > > > > > > >>others like base address register s filling is optional. Vendor cant > >>hardware this. The value will be populated by the PCI subsystem depnidne > >>on the memory model choosen duriong compilation. > > > > > > > >>Is it that if not filled the linux kernel will give the address and > >>copies it to device > >>configuration registers using kernel functions (pci_write_config)? NO > > > >the job is done by PCI Subsystem and not some vendor > > > >>Please help me regarding this as I am working on a target board where the > >>pci bus I am using to interact with the pci devices. > >> > >>Thanks, > >>indiraa. > >> > >>-- > >>Kernelnewbies: Help each other learn about the Linux kernel. > >>Archive: > >><http://mail.nl.linux.org/kernelnewbies/>http://mail.nl.linux.org/kernelnewbies/ > >>FAQ: <http://kernelnewbies.org/faq/>http://kernelnewbies.org/faq/ > > > > > > > >-- > >Destination is never your destiny > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
