These functions read registers of the appropriate size from the configuration space of the given device. All PCI devices have a unique address in configuration space. Returns true if one is found and false if not. The number will be incremented as new busses are discovered. As an example, see the pci1 test which can be configured to enable the devices it finds.
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This is how the function is used in the pci1 test:. The PCI standard supports up to busses with each bus having up to 32 devices and each device having up to 8 functions.
This is comprised of the bus number, device number and functional unit numbers packed into a single word. What happens is that the bus gets initialized and a scan is started.
This macro, if defined, may be used to limit which Ecoa are discovered and configured. Pic list of vendor and device codes is not complete: For 32 bit PCI memory regions, each 32 bit word will be an actual pointer that can be used immediately by the driver: These functions allow a device driver to set up its own mappings if it wants.
PCI Library reference The number will be incremented as new busses are discovered. The command register can also be written to, controlling among other things whether the device responds to IO and memory access from the bus.
Otherwise, false is returned. The 64 bit type is used to allow handling 64 bit devices in the future, should it be necessary, without fcos the library’s API. Specific config information These can be accessed with these functions:.
Nick Garnett – Re: PCI Address Mapping
It will recursively configure all devices on the given bus and all subordinate busses. A device can have extra config registers not specified by the PCI specification. If the function returns false, no interrupts will be generated by the device.
The devid will be updated with the ID of the next device found. The environment in which a platform operates will dictate if and how eCos should configure devices on the PCI bus.
Pcci for devices Doing this will be platform specific and is currently beyond the scope of the HAL. This is sometimes necessary for platforms with limited PCI windows.
Re: PCI Address Mapping
This address is comprised of a bus number, a device number, and a function number. All PCI devices have a unique address in configuration space. If the call returns truea loop is entered where the found devid is used. When a valid device ID devid is found using one of the above functions, the associated device can be queried pcii controlled using the functions:.
The PCI library is an optional part of eCos, and is only applicable to some platforms. Normally these base addresses will be set to default values based on the platform.
Michael Kelly – Re: PCI Address Mapping
Types and data structures. Returns true if another device is found and false if not. The bases are initialized with default values provided by the Ecps.
This function interrogates the device and determines which HAL interrupt vector it is connected to. Table of Contents It should not be necessary to use these macros under normal circumstances.