pci_write_config()

Write to the configuration space of a PCI device

Synopsis:

#include <hw/pci.h>

int pci_write_config( void* handle,
                      unsigned offset,
                      unsigned count,
                      size_t size,
                      const void* buff );

Arguments:

handle: The handle returned by pci_attach_device().
offset: The offset into the configuration space where you want to write the data.
count: The number of objects that you want to write.
size: The size of each object.
buff: A pointer to the data that you want to write.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

The pci_write_config() function writes count objects of the specified size from buff at the given offset to the configuration space of the PCI device specified by handle. For the details of the configuration space, see the _pci_config_regs structure in <hw/pci.h>.

You must successfully call pci_attach() before calling any of the other PCI functions.

Returns:

PCI_BAD_REGISTER_NUMBER: The offset specified is invalid.
PCI_BUFFER_TOO_SMALL: The size argument is too large.
PCI_SET_FAILED: An error occurred writing to the configuration space of the device.
PCI_SUCCESS: Success.
PCI_UNSUPPORTED_FUNCT: This device doesn't support writing to its configuration space.
-1: You haven't called pci_attach(), or the call to it failed.

Classification:

QNX Neutrino

Safety:
Cancellation point	Yes
Interrupt handler	No
Signal handler	Yes
Thread	Yes