The header file contains definitions for the common configuration structure offsets and specimen values for device, vendor and class code. The PCI library is an optional part of eCos, and is only applicable to some platforms. It will recursively configure all devices on the given bus and all subordinate busses. Returns true if another device is found and false if not. Searches the PCI bus configuration space for a device with the given vendor and device ids. This is sometimes necessary for devices which need special handling. The following code fragment demonstrates how these macros may be used:.
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This may also depend on which slot the device occupies.
These can be accessed with these functions:. This is done using the function:. If the call returns ecpsa loop is entered where the found devid is used. This macro, if defined, may be used to limit which BARs are discovered and configured. Allocate memory and IO space to all base address registers using the current memory and IO base addresses in the library.
Chapter The eCos PCI Library
When the device has been allocated memory space it can be activated. The number will be incremented as new busses are discovered.
The PCI support library provides a set of routines for accessing the PCI bus configuration space in a portable manner. Before devices on the bus can be used, they must be configured. This function sets the PCI configuration information for the device indicated in devid.
This is sometimes necessary for platforms with limited PCI windows. What happens is ecoz the bus gets initialized and a scan is started.
Re: PCI Address Mapping
The loop terminates when no more devices are found on the bus. It should not be necessary to use these macros under normal circumstances. The low level API is used by the PCI library itself to access the hardware in a platform-specific manner, and may also be used by device drivers to access the PCI configuration space directly. Ecow function interrogates the device and determines which HAL interrupt vector it is connected to.
Doing this will be platform specific and is currently beyond the scope of the HAL. All PCI devices have a wcos address in configuration space. This functionality may be adopted by the eCos HAL if deemed useful in the future.
Nick Garnett – Re: PCI Address Mapping
Initialize the PCI hardware so that the configuration space may be accessed. The bases are initialized with default values provided by the HAL. If the platform acts as a host on a single PCI bus, then devices may be configured individually from the relevant device driver.
The header file contains definitions for the common configuration structure offsets and specimen values for device, vendor and class code. If successful, true is returned.
Special devices called bridges are used pcii connect two PCI busses together. This function gets the PCI configuration information for the device indicated in devid. This is comprised of the bus number, device number and functional unit numbers packed into a single word.
The list of vendor and device codes is not complete: Table of Contents It is possible for an application to override these using the following functions:.
The PCI bus supports several address spaces: The following function will do the initialization only once, so it’s safe to call from multiple drivers:. The 2GB available on many systems should suffice though. This is how the function is used in the pci1 test:.